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<mods:title>A further step towards the characterisation of Terebellides (Annelida, Trichobranchidae) diversity in the Northeast Atlantic, with the description of a new species</mods:title>
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<mods:namePart>Barroso, Maria</mods:namePart>
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<mods:affiliation>Departamento de Bioloxia, Universidade da Coruna, A Coruna, Spain</mods:affiliation>
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<mods:namePart>Moreira, Juan</mods:namePart>
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<mods:affiliation>Departamento de Biologia (Zoologia) &amp; Centro de Investigacion en Biodiversidad y Cambio Global (CIBC-UAM), Facultad de Ciencias, Universidad Autonoma de Madrid, Madrid, Spain</mods:affiliation>
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<mods:namePart>Capa, Maria</mods:namePart>
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<mods:namePart>Nygren, Arne</mods:namePart>
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<mods:namePart>Parapar, Julio</mods:namePart>
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<taxonomicName LSID="612825B9-1C42-512D-AD48-8660C27B8944" authority="Group B (sensu Nygren et al. 2018)" authorityName="Group B (sensu Nygren et al. 2018)" class="Polychaeta" family="Trichobranchidae" genus="Terebellides" higherTaxonomySource="treatment-meta" kingdom="Animalia" lsidName="Terebellides" order="Terebellida" pageId="0" pageNumber="85" phylum="Annelida" rank="genus">Terebellides Group B (sensu Nygren et al. 2018)</taxonomicName>
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<figureCitation captionStart="Figure 2" captionStartId="F2" captionText="Figure 2. STM photographs of live specimens of several Terebellides species (non-type specimens) A, B Terebellides shetlandica Parapar, Moreira &amp; O'Reilly, 2016 (species 1; A ZMBN 116171 B ZMBN 116181) C Terebellides lavesquei sp. nov. (species 5; GNM 15112) D, E Terebellides williamsae Jirkov, 1989 (species 2; D GNM 15108 E GNM 15109) F Terebellides gracilis Malm, 1874 (species 3; GNM 15111). Abbreviations: bdl - branchial dorsal lobe; bf - branchial filament; bvl - branchial ventral lobe; ooc - oocytes; wTC - white thoracic chaetiger." figureDoi="10.3897/zookeys.1132.91244.figure2" httpUri="https://binary.pensoft.net/fig/775018" pageId="0" pageNumber="85">Figs 2</figureCitation>
<figureCitation captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. STM photographs of several Terebellides species (A, C-F non-type specimens) A Terebellides shetlandica Parapar, Moreira &amp; O'Reilly, 2016 (species 1; ZMBN 116186) B Terebellides lavesquei sp. nov. (species 5; holotype, ZMBN 116322) C Terebellides atlantis Williams, 1984 (species 16; ZMBN 116472) D Terebellides irinae Gagaev, 2009 (species 24; ZMBN 116498) E Terebellides williamsae Jirkov, 1989 (species 2; ZMBN 116269) F Terebellides gracilis Malm, 1874 (species 3; ZMBN 116283). Abbreviations: bdl - branchial dorsal lobe; bf - branchial filament; bvl - branchial ventral lobe; ooc - oocytes; wTC - white thoracic chaetiger." figureDoi="10.3897/zookeys.1132.91244.figure3" httpUri="https://binary.pensoft.net/fig/775019" pageId="0" pageNumber="85">, 3</figureCitation>
<figureCitation captionStart="Figure 4" captionStartId="F4" captionText="Figure 4. Line drawings of several Terebellides species (A, C, D non-type specimens) A Terebellides shetlandica Parapar, Moreira &amp; O'Reilly, 2016 (species 1; ZMBN 116186), anterior end, right lateral view B Terebellides lavesquei sp. nov. (holotype; ZMBN 116322), anterior end, left lateral view C Terebellides irinae Gagaev, 2009 (species 24; ZMBN 116498), anterior end, ventral view D Terebellides gracilis Malm, 1874 (species 3; ZMBN 116283), anterior end, right lateral view. Abbreviations: bdl - branchial dorsal lobe; bf - branchial filament; bvl - branchial ventral lobe; tm - tentacular membrane." figureDoi="10.3897/zookeys.1132.91244.figure4" httpUri="https://binary.pensoft.net/fig/775020" pageId="0" pageNumber="85">, 4</figureCitation>
<figureCitation captionStart="Figure 5" captionStartId="F5" captionText="Figure 5. Terebellides shetlandica Parapar, Moreira &amp; O'Reilly, 2016 (species 1; non-type specimens, ZMBN 116181, ZMBN 116204 and ZMBN 116219), SEM micrographs A anterior end, dorsal view B anterior end, left lateral view C TC 6 (TU 1), geniculate chaeta D thoracic uncinus E abdominal neuropodium F abdominal uncini. Abbreviations: bdl - branchial dorsal lobe; bf - branchial filament; bvl - branchial ventral lobe; cap - capitium; cop - copepod; dpn - dorsal projection of notopodium; TC - thoracic chaetiger; tll - thoracic lateral lobes; tm - tentacular membrane; TU - thoracic unciniger." figureDoi="10.3897/zookeys.1132.91244.figure5" httpUri="https://binary.pensoft.net/fig/775021" pageId="0" pageNumber="85">, 5</figureCitation>
<figureCitation captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. Terebellides lavesquei sp. nov. (non-type specimen, ZMBN 116332), SEM micrographs A anterior end, left lateral view B branchial lamellae, detail C ciliary row, detail D copepod E copepod, anterior end. Abbreviations: bdl - branchial dorsal lobe; bf - branchial filament; cop - copepod; cr - ciliary row." figureDoi="10.3897/zookeys.1132.91244.figure6" httpUri="https://binary.pensoft.net/fig/775022" pageId="0" pageNumber="85">, 6</figureCitation>
<figureCitation captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Terebellides lavesquei sp. nov. (non-type specimens, NTNU-VM 61387 and ZMBN 116332), SEM micrographs A TC 6 (TU 1), geniculate chaetae B thoracic uncini C double row of thoracic uncini D abdominal uncini. Abbreviations: cap - capitium; TC - thoracic chaetiger; TU - thoracic unciniger." figureDoi="10.3897/zookeys.1132.91244.figure7" httpUri="https://binary.pensoft.net/fig/775023" pageId="0" pageNumber="85">, 7</figureCitation>
<figureCitation captionStart="Figure 8" captionStartId="F8" captionText="Figure 8. Terebellides atlantis Williams, 1984 (species 16; non-type specimens, ZMBN 116454 and ZMBN 116459), SEM micrographs A anterior end, left lateral view B branchiae, detail C TC 6 (TU 1), geniculate chaetae D thoracic uncini E abdominal neuropodium F abdominal uncini. Abbreviations: bf - branchial filament; bvl - branchial ventral lobe; cap - capitium; dpn - dorsal projection of notopodium; TC - thoracic chaetiger; TU - thoracic unciniger." figureDoi="10.3897/zookeys.1132.91244.figure8" httpUri="https://binary.pensoft.net/fig/775024" pageId="0" pageNumber="85">, 8</figureCitation>
<figureCitation captionStart="Figure 9" captionStartId="F9" captionText="Figure 9. Relationship between number of abdominal chaetigers and body length (complete specimens considered except for T. irinae)." figureDoi="10.3897/zookeys.1132.91244.figure9" httpUri="https://binary.pensoft.net/fig/775025" pageId="0" pageNumber="85">, 9</figureCitation>
<figureCitation captionStart="Figure 10" captionStartId="F10" captionText="Figure 10. Geographic distribution of species of Terebellides in Northeast Atlantic Ocean A Terebellides shetlandica Parapar, Moreira &amp; O'Reilly, 2016 B Terebellides lavesquei sp. nov. C Terebellides atlantis Williams, 1984 D Terebellides irinae Gagaev, 2009 E Terebellides williamsae Jirkov, 1989 F Terebellides gracilis Malm, 1874. Pink star denotes the type locality of each taxon." figureDoi="10.3897/zookeys.1132.91244.figure10" httpUri="https://binary.pensoft.net/fig/775026" pageId="0" pageNumber="85">, 10</figureCitation>
<figureCitation captionStart="Figure 11" captionStartId="F11" captionText="Figure 11. Bathymetric distribution of Terebellides species studied in this work." figureDoi="10.3897/zookeys.1132.91244.figure11" httpUri="https://binary.pensoft.net/fig/775027" pageId="0" pageNumber="85">, 11</figureCitation>
<figureCitation captionStart="Figure 12" captionStartId="F12" captionText="Figure 12. Body MG staining patterns in ventral view of Terebellides species. Terebellides shetlandica Parapar, Moreira &amp; O'Reilly, 2016, Terebellides lavesquei sp. nov., Terebellides atlantis Williams, 1984, Terebellides irinae Gagaev, 2009, Terebellides williamsae Jirkov, 1989 and Terebellides gracilis Malm, 1874. Segments indicated in Arabic numbers." figureDoi="10.3897/zookeys.1132.91244.figure12" httpUri="https://binary.pensoft.net/fig/775028" pageId="0" pageNumber="85">, 12</figureCitation>
</paragraph>
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<paragraph pageId="0" pageNumber="85">Description.</paragraph>
<paragraph pageId="0" pageNumber="85">
The morphological features shared by all examined species in Group B in this paper (clades 1, 5, and 16) are itemised below. Some of these are also shared by Groups A, C, and D as defined in 
<bibRefCitation DOI="https://doi.org/10.1371/journal.pone.0198356" author="Nygren, A" journalOrPublisher="Molecular Phylogenetics and Evolution" pageId="0" pageNumber="85" refId="B26" refString="Nygren, A, Parapar, J, Pons, J, Meissner, K, Bakken, T, Kongsrud, JA, Oug, E, Gaeva, D, Sikorski, A, Johansen, RA, Hutchings, PA, Lavesque, N, Capa, M, 2018. A mega-cryptic species complex hidden among one of the most common annelids in the North-East Atlantic. PLoS ONE 13(6): e0198356. https://doi.org/10.1371/journal.pone.0198356" title="A mega-cryptic species complex hidden among one of the most common annelids in the North-East Atlantic. PLoS ONE 13 (6): e 0198356." url="https://doi.org/10.1371/journal.pone.0198356" year="2018">Nygren et al. (2018)</bibRefCitation>
(see Remarks below). Clades 4, 14, and 26 will be studied elsewhere; formal descriptions of clades 17 and 27 will wait until more material is available.
</paragraph>
<paragraph pageId="0" pageNumber="85">
<emphasis bold="true" pageId="0" pageNumber="85">
<emphasis italics="true" pageId="0" pageNumber="85">Body appearance</emphasis>
.
</emphasis>
Complete individuals ranging from 5.0-35.0 mm in length. Body tapering posteriorly with segments increasingly shorter and crowded towards pygidium. Prostomium compact; large tentacular membrane surrounding mouth (Figs 
<figureCitation captionStart="Figure 2" captionStartId="F2" captionText="Figure 2. STM photographs of live specimens of several Terebellides species (non-type specimens) A, B Terebellides shetlandica Parapar, Moreira &amp; O'Reilly, 2016 (species 1; A ZMBN 116171 B ZMBN 116181) C Terebellides lavesquei sp. nov. (species 5; GNM 15112) D, E Terebellides williamsae Jirkov, 1989 (species 2; D GNM 15108 E GNM 15109) F Terebellides gracilis Malm, 1874 (species 3; GNM 15111). Abbreviations: bdl - branchial dorsal lobe; bf - branchial filament; bvl - branchial ventral lobe; ooc - oocytes; wTC - white thoracic chaetiger." figureDoi="10.3897/zookeys.1132.91244.figure2" httpUri="https://binary.pensoft.net/fig/775018" pageId="0" pageNumber="85">2B</figureCitation>
, 
<figureCitation captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. STM photographs of several Terebellides species (A, C-F non-type specimens) A Terebellides shetlandica Parapar, Moreira &amp; O'Reilly, 2016 (species 1; ZMBN 116186) B Terebellides lavesquei sp. nov. (species 5; holotype, ZMBN 116322) C Terebellides atlantis Williams, 1984 (species 16; ZMBN 116472) D Terebellides irinae Gagaev, 2009 (species 24; ZMBN 116498) E Terebellides williamsae Jirkov, 1989 (species 2; ZMBN 116269) F Terebellides gracilis Malm, 1874 (species 3; ZMBN 116283). Abbreviations: bdl - branchial dorsal lobe; bf - branchial filament; bvl - branchial ventral lobe; ooc - oocytes; wTC - white thoracic chaetiger." figureDoi="10.3897/zookeys.1132.91244.figure3" httpUri="https://binary.pensoft.net/fig/775019" pageId="0" pageNumber="85">3B, C</figureCitation>
), with typical buccal tentacles with expanded tips (Figs 
<figureCitation captionStart="Figure 2" captionStartId="F2" captionText="Figure 2. STM photographs of live specimens of several Terebellides species (non-type specimens) A, B Terebellides shetlandica Parapar, Moreira &amp; O'Reilly, 2016 (species 1; A ZMBN 116171 B ZMBN 116181) C Terebellides lavesquei sp. nov. (species 5; GNM 15112) D, E Terebellides williamsae Jirkov, 1989 (species 2; D GNM 15108 E GNM 15109) F Terebellides gracilis Malm, 1874 (species 3; GNM 15111). Abbreviations: bdl - branchial dorsal lobe; bf - branchial filament; bvl - branchial ventral lobe; ooc - oocytes; wTC - white thoracic chaetiger." figureDoi="10.3897/zookeys.1132.91244.figure2" httpUri="https://binary.pensoft.net/fig/775018" pageId="0" pageNumber="85">2A, B</figureCitation>
, 
<figureCitation captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. STM photographs of several Terebellides species (A, C-F non-type specimens) A Terebellides shetlandica Parapar, Moreira &amp; O'Reilly, 2016 (species 1; ZMBN 116186) B Terebellides lavesquei sp. nov. (species 5; holotype, ZMBN 116322) C Terebellides atlantis Williams, 1984 (species 16; ZMBN 116472) D Terebellides irinae Gagaev, 2009 (species 24; ZMBN 116498) E Terebellides williamsae Jirkov, 1989 (species 2; ZMBN 116269) F Terebellides gracilis Malm, 1874 (species 3; ZMBN 116283). Abbreviations: bdl - branchial dorsal lobe; bf - branchial filament; bvl - branchial ventral lobe; ooc - oocytes; wTC - white thoracic chaetiger." figureDoi="10.3897/zookeys.1132.91244.figure3" httpUri="https://binary.pensoft.net/fig/775019" pageId="0" pageNumber="85">3A, B</figureCitation>
). SG 1 as an expanded structure below tentacular membrane in a lower lip.
</paragraph>
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<emphasis bold="true" pageId="0" pageNumber="85">Figure 2.</emphasis>
STM photographs of live specimens of several 
<taxonomicName class="Polychaeta" family="Trichobranchidae" genus="Terebellides" kingdom="Animalia" lsidName="Terebellides" order="Canalipalpata" pageId="0" pageNumber="85" phylum="Annelida" rank="genus">
<emphasis italics="true" pageId="0" pageNumber="85">Terebellides</emphasis>
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species (non-type specimens) 
<emphasis bold="true" pageId="0" pageNumber="85">A, B</emphasis>
<taxonomicName authorityName="Parapar, Moreira &amp; O'Reilly" authorityYear="2016" class="Polychaeta" family="Trichobranchidae" genus="Terebellides" kingdom="Animalia" lsidName="Terebellides shetlandica" order="Canalipalpata" pageId="0" pageNumber="85" phylum="Annelida" rank="species" species="shetlandica">
<emphasis italics="true" pageId="0" pageNumber="85">Terebellides shetlandica</emphasis>
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Parapar, Moreira &amp; 
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, 2016 (species 1; 
<emphasis bold="true" pageId="0" pageNumber="85">A</emphasis>
ZMBN116171 
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ZMBN116181) 
<emphasis bold="true" pageId="0" pageNumber="85">C</emphasis>
<taxonomicName authorityName="Barroso &amp; Moreira &amp; Capa &amp; Nygren &amp; Parapar" authorityYear="2022" class="Polychaeta" family="Trichobranchidae" genus="Terebellides" kingdom="Animalia" lsidName="Terebellides lavesquei" order="Canalipalpata" pageId="0" pageNumber="85" phylum="Annelida" rank="species" species="lavesquei">
<emphasis italics="true" pageId="0" pageNumber="85">Terebellides lavesquei</emphasis>
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sp. nov. (species 5; GNM15112) 
<emphasis bold="true" pageId="0" pageNumber="85">D, E</emphasis>
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<emphasis italics="true" pageId="0" pageNumber="85">Terebellides williamsae</emphasis>
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Jirkov, 1989 (species 2; 
<emphasis bold="true" pageId="0" pageNumber="85">D</emphasis>
GNM15108 
<emphasis bold="true" pageId="0" pageNumber="85">E</emphasis>
GNM15109) 
<emphasis bold="true" pageId="0" pageNumber="85">F</emphasis>
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<emphasis italics="true" pageId="0" pageNumber="85">Terebellides gracilis</emphasis>
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Malm, 1874 (species 3; GNM15111). Abbreviations: bdl - branchial dorsal lobe; bf - branchial filament; bvl - branchial ventral lobe; ooc - oocytes; wTC - white thoracic chaetiger.
</paragraph>
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<emphasis bold="true" pageId="0" pageNumber="85">Figure 3.</emphasis>
STM photographs of several 
<taxonomicName class="Polychaeta" family="Trichobranchidae" genus="Terebellides" kingdom="Animalia" lsidName="Terebellides" order="Canalipalpata" pageId="0" pageNumber="85" phylum="Annelida" rank="genus">
<emphasis italics="true" pageId="0" pageNumber="85">Terebellides</emphasis>
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species (
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non-type specimens) 
<emphasis bold="true" pageId="0" pageNumber="85">A</emphasis>
<taxonomicName authorityName="Parapar, Moreira &amp; O'Reilly" authorityYear="2016" class="Polychaeta" family="Trichobranchidae" genus="Terebellides" kingdom="Animalia" lsidName="Terebellides shetlandica" order="Canalipalpata" pageId="0" pageNumber="85" phylum="Annelida" rank="species" species="shetlandica">
<emphasis italics="true" pageId="0" pageNumber="85">Terebellides shetlandica</emphasis>
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Parapar, Moreira &amp; 
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, 2016 (species 1; ZMBN116186) 
<emphasis bold="true" pageId="0" pageNumber="85">B</emphasis>
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<emphasis italics="true" pageId="0" pageNumber="85">Terebellides lavesquei</emphasis>
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sp. nov. (species 5; holotype, ZMBN116322) 
<emphasis bold="true" pageId="0" pageNumber="85">C</emphasis>
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Williams, 1984 (species 16; ZMBN116472) 
<emphasis bold="true" pageId="0" pageNumber="85">D</emphasis>
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Gagaev, 2009 (species 24; ZMBN116498) 
<emphasis bold="true" pageId="0" pageNumber="85">E</emphasis>
<taxonomicName authorityName="Jirkov" authorityYear="1989" class="Polychaeta" family="Trichobranchidae" genus="Terebellides" kingdom="Animalia" lsidName="Terebellides williamsae" order="Canalipalpata" pageId="0" pageNumber="85" phylum="Annelida" rank="species" species="williamsae">
<emphasis italics="true" pageId="0" pageNumber="85">Terebellides williamsae</emphasis>
</taxonomicName>
Jirkov, 1989 (species 2; ZMBN116269) 
<emphasis bold="true" pageId="0" pageNumber="85">F</emphasis>
<taxonomicName authorityName="Malm" authorityYear="1874" class="Polychaeta" family="Trichobranchidae" genus="Terebellides" kingdom="Animalia" lsidName="Terebellides gracilis" order="Canalipalpata" pageId="0" pageNumber="85" phylum="Annelida" rank="species" species="gracilis">
<emphasis italics="true" pageId="0" pageNumber="85">Terebellides gracilis</emphasis>
</taxonomicName>
Malm, 1874 (species 3; ZMBN116283). Abbreviations: bdl - branchial dorsal lobe; bf - branchial filament; bvl - branchial ventral lobe; ooc - oocytes; wTC - white thoracic chaetiger.
</paragraph>
</caption>
<paragraph pageId="0" pageNumber="85">
<emphasis bold="true" pageId="0" pageNumber="85">
<emphasis italics="true" pageId="0" pageNumber="85">Branchiae</emphasis>
.
</emphasis>
Branchiae arising as single structure from SG 3, with a single stalked mid-dorsal stem (Figs 
<figureCitation captionStart="Figure 2" captionStartId="F2" captionText="Figure 2. STM photographs of live specimens of several Terebellides species (non-type specimens) A, B Terebellides shetlandica Parapar, Moreira &amp; O'Reilly, 2016 (species 1; A ZMBN 116171 B ZMBN 116181) C Terebellides lavesquei sp. nov. (species 5; GNM 15112) D, E Terebellides williamsae Jirkov, 1989 (species 2; D GNM 15108 E GNM 15109) F Terebellides gracilis Malm, 1874 (species 3; GNM 15111). Abbreviations: bdl - branchial dorsal lobe; bf - branchial filament; bvl - branchial ventral lobe; ooc - oocytes; wTC - white thoracic chaetiger." figureDoi="10.3897/zookeys.1132.91244.figure2" httpUri="https://binary.pensoft.net/fig/775018" pageId="0" pageNumber="85">2A, B</figureCitation>
, 
<figureCitation captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. STM photographs of several Terebellides species (A, C-F non-type specimens) A Terebellides shetlandica Parapar, Moreira &amp; O'Reilly, 2016 (species 1; ZMBN 116186) B Terebellides lavesquei sp. nov. (species 5; holotype, ZMBN 116322) C Terebellides atlantis Williams, 1984 (species 16; ZMBN 116472) D Terebellides irinae Gagaev, 2009 (species 24; ZMBN 116498) E Terebellides williamsae Jirkov, 1989 (species 2; ZMBN 116269) F Terebellides gracilis Malm, 1874 (species 3; ZMBN 116283). Abbreviations: bdl - branchial dorsal lobe; bf - branchial filament; bvl - branchial ventral lobe; ooc - oocytes; wTC - white thoracic chaetiger." figureDoi="10.3897/zookeys.1132.91244.figure3" httpUri="https://binary.pensoft.net/fig/775019" pageId="0" pageNumber="85">3B, C</figureCitation>
, 
<figureCitation captionStart="Figure 4" captionStartId="F4" captionText="Figure 4. Line drawings of several Terebellides species (A, C, D non-type specimens) A Terebellides shetlandica Parapar, Moreira &amp; O'Reilly, 2016 (species 1; ZMBN 116186), anterior end, right lateral view B Terebellides lavesquei sp. nov. (holotype; ZMBN 116322), anterior end, left lateral view C Terebellides irinae Gagaev, 2009 (species 24; ZMBN 116498), anterior end, ventral view D Terebellides gracilis Malm, 1874 (species 3; ZMBN 116283), anterior end, right lateral view. Abbreviations: bdl - branchial dorsal lobe; bf - branchial filament; bvl - branchial ventral lobe; tm - tentacular membrane." figureDoi="10.3897/zookeys.1132.91244.figure4" httpUri="https://binary.pensoft.net/fig/775020" pageId="0" pageNumber="85">4B</figureCitation>
), lobes not fused or partially fused, ventral ones obscured or not by dorsal ones (Figs 
<figureCitation captionStart="Figure 2" captionStartId="F2" captionText="Figure 2. STM photographs of live specimens of several Terebellides species (non-type specimens) A, B Terebellides shetlandica Parapar, Moreira &amp; O'Reilly, 2016 (species 1; A ZMBN 116171 B ZMBN 116181) C Terebellides lavesquei sp. nov. (species 5; GNM 15112) D, E Terebellides williamsae Jirkov, 1989 (species 2; D GNM 15108 E GNM 15109) F Terebellides gracilis Malm, 1874 (species 3; GNM 15111). Abbreviations: bdl - branchial dorsal lobe; bf - branchial filament; bvl - branchial ventral lobe; ooc - oocytes; wTC - white thoracic chaetiger." figureDoi="10.3897/zookeys.1132.91244.figure2" httpUri="https://binary.pensoft.net/fig/775018" pageId="0" pageNumber="85">2A, B</figureCitation>
, 
<figureCitation captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. STM photographs of several Terebellides species (A, C-F non-type specimens) A Terebellides shetlandica Parapar, Moreira &amp; O'Reilly, 2016 (species 1; ZMBN 116186) B Terebellides lavesquei sp. nov. (species 5; holotype, ZMBN 116322) C Terebellides atlantis Williams, 1984 (species 16; ZMBN 116472) D Terebellides irinae Gagaev, 2009 (species 24; ZMBN 116498) E Terebellides williamsae Jirkov, 1989 (species 2; ZMBN 116269) F Terebellides gracilis Malm, 1874 (species 3; ZMBN 116283). Abbreviations: bdl - branchial dorsal lobe; bf - branchial filament; bvl - branchial ventral lobe; ooc - oocytes; wTC - white thoracic chaetiger." figureDoi="10.3897/zookeys.1132.91244.figure3" httpUri="https://binary.pensoft.net/fig/775019" pageId="0" pageNumber="85">3A-C</figureCitation>
, 
<figureCitation captionStart="Figure 4" captionStartId="F4" captionText="Figure 4. Line drawings of several Terebellides species (A, C, D non-type specimens) A Terebellides shetlandica Parapar, Moreira &amp; O'Reilly, 2016 (species 1; ZMBN 116186), anterior end, right lateral view B Terebellides lavesquei sp. nov. (holotype; ZMBN 116322), anterior end, left lateral view C Terebellides irinae Gagaev, 2009 (species 24; ZMBN 116498), anterior end, ventral view D Terebellides gracilis Malm, 1874 (species 3; ZMBN 116283), anterior end, right lateral view. Abbreviations: bdl - branchial dorsal lobe; bf - branchial filament; bvl - branchial ventral lobe; tm - tentacular membrane." figureDoi="10.3897/zookeys.1132.91244.figure4" httpUri="https://binary.pensoft.net/fig/775020" pageId="0" pageNumber="85">4A, B</figureCitation>
). Dorsal lobes ending posteriorly in short terminal papilla and ventral lobes ending in long filaments (Figs 
<figureCitation captionStart="Figure 2" captionStartId="F2" captionText="Figure 2. STM photographs of live specimens of several Terebellides species (non-type specimens) A, B Terebellides shetlandica Parapar, Moreira &amp; O'Reilly, 2016 (species 1; A ZMBN 116171 B ZMBN 116181) C Terebellides lavesquei sp. nov. (species 5; GNM 15112) D, E Terebellides williamsae Jirkov, 1989 (species 2; D GNM 15108 E GNM 15109) F Terebellides gracilis Malm, 1874 (species 3; GNM 15111). Abbreviations: bdl - branchial dorsal lobe; bf - branchial filament; bvl - branchial ventral lobe; ooc - oocytes; wTC - white thoracic chaetiger." figureDoi="10.3897/zookeys.1132.91244.figure2" httpUri="https://binary.pensoft.net/fig/775018" pageId="0" pageNumber="85">2B</figureCitation>
, 
<figureCitation captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. STM photographs of several Terebellides species (A, C-F non-type specimens) A Terebellides shetlandica Parapar, Moreira &amp; O'Reilly, 2016 (species 1; ZMBN 116186) B Terebellides lavesquei sp. nov. (species 5; holotype, ZMBN 116322) C Terebellides atlantis Williams, 1984 (species 16; ZMBN 116472) D Terebellides irinae Gagaev, 2009 (species 24; ZMBN 116498) E Terebellides williamsae Jirkov, 1989 (species 2; ZMBN 116269) F Terebellides gracilis Malm, 1874 (species 3; ZMBN 116283). Abbreviations: bdl - branchial dorsal lobe; bf - branchial filament; bvl - branchial ventral lobe; ooc - oocytes; wTC - white thoracic chaetiger." figureDoi="10.3897/zookeys.1132.91244.figure3" httpUri="https://binary.pensoft.net/fig/775019" pageId="0" pageNumber="85">3A, B</figureCitation>
). Anterior projection of dorsal lobes (fifth lobe) normally absent but present only in clade 5 (Fig. 
<figureCitation captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. STM photographs of several Terebellides species (A, C-F non-type specimens) A Terebellides shetlandica Parapar, Moreira &amp; O'Reilly, 2016 (species 1; ZMBN 116186) B Terebellides lavesquei sp. nov. (species 5; holotype, ZMBN 116322) C Terebellides atlantis Williams, 1984 (species 16; ZMBN 116472) D Terebellides irinae Gagaev, 2009 (species 24; ZMBN 116498) E Terebellides williamsae Jirkov, 1989 (species 2; ZMBN 116269) F Terebellides gracilis Malm, 1874 (species 3; ZMBN 116283). Abbreviations: bdl - branchial dorsal lobe; bf - branchial filament; bvl - branchial ventral lobe; ooc - oocytes; wTC - white thoracic chaetiger." figureDoi="10.3897/zookeys.1132.91244.figure3" httpUri="https://binary.pensoft.net/fig/775019" pageId="0" pageNumber="85">3B</figureCitation>
). Posterior end of dorsal lobes reaching TC 4 (Figs 
<figureCitation captionStart="Figure 2" captionStartId="F2" captionText="Figure 2. STM photographs of live specimens of several Terebellides species (non-type specimens) A, B Terebellides shetlandica Parapar, Moreira &amp; O'Reilly, 2016 (species 1; A ZMBN 116171 B ZMBN 116181) C Terebellides lavesquei sp. nov. (species 5; GNM 15112) D, E Terebellides williamsae Jirkov, 1989 (species 2; D GNM 15108 E GNM 15109) F Terebellides gracilis Malm, 1874 (species 3; GNM 15111). Abbreviations: bdl - branchial dorsal lobe; bf - branchial filament; bvl - branchial ventral lobe; ooc - oocytes; wTC - white thoracic chaetiger." figureDoi="10.3897/zookeys.1132.91244.figure2" httpUri="https://binary.pensoft.net/fig/775018" pageId="0" pageNumber="85">2A, B</figureCitation>
, 
<figureCitation captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. STM photographs of several Terebellides species (A, C-F non-type specimens) A Terebellides shetlandica Parapar, Moreira &amp; O'Reilly, 2016 (species 1; ZMBN 116186) B Terebellides lavesquei sp. nov. (species 5; holotype, ZMBN 116322) C Terebellides atlantis Williams, 1984 (species 16; ZMBN 116472) D Terebellides irinae Gagaev, 2009 (species 24; ZMBN 116498) E Terebellides williamsae Jirkov, 1989 (species 2; ZMBN 116269) F Terebellides gracilis Malm, 1874 (species 3; ZMBN 116283). Abbreviations: bdl - branchial dorsal lobe; bf - branchial filament; bvl - branchial ventral lobe; ooc - oocytes; wTC - white thoracic chaetiger." figureDoi="10.3897/zookeys.1132.91244.figure3" httpUri="https://binary.pensoft.net/fig/775019" pageId="0" pageNumber="85">3A, B</figureCitation>
). Branchial lamellae provided with several parallel rows of cilia in inner face (Fig. 
<figureCitation captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. Terebellides lavesquei sp. nov. (non-type specimen, ZMBN 116332), SEM micrographs A anterior end, left lateral view B branchial lamellae, detail C ciliary row, detail D copepod E copepod, anterior end. Abbreviations: bdl - branchial dorsal lobe; bf - branchial filament; cop - copepod; cr - ciliary row." figureDoi="10.3897/zookeys.1132.91244.figure6" httpUri="https://binary.pensoft.net/fig/775022" pageId="0" pageNumber="85">6C</figureCitation>
) and ciliary tufts not observed. Ciliary papillae absent in branchial lamellae margin.
</paragraph>
<paragraph pageId="0" pageNumber="85">
<emphasis bold="true" pageId="0" pageNumber="85">
<emphasis italics="true" pageId="0" pageNumber="85">Thorax</emphasis>
.
</emphasis>
Eighteen pairs of notopodia (SG 3-20), those of TC 1 ca. as long as subsequent ones or slightly shorter (Figs 
<figureCitation captionStart="Figure 2" captionStartId="F2" captionText="Figure 2. STM photographs of live specimens of several Terebellides species (non-type specimens) A, B Terebellides shetlandica Parapar, Moreira &amp; O'Reilly, 2016 (species 1; A ZMBN 116171 B ZMBN 116181) C Terebellides lavesquei sp. nov. (species 5; GNM 15112) D, E Terebellides williamsae Jirkov, 1989 (species 2; D GNM 15108 E GNM 15109) F Terebellides gracilis Malm, 1874 (species 3; GNM 15111). Abbreviations: bdl - branchial dorsal lobe; bf - branchial filament; bvl - branchial ventral lobe; ooc - oocytes; wTC - white thoracic chaetiger." figureDoi="10.3897/zookeys.1132.91244.figure2" httpUri="https://binary.pensoft.net/fig/775018" pageId="0" pageNumber="85">2A</figureCitation>
, 
<figureCitation captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. STM photographs of several Terebellides species (A, C-F non-type specimens) A Terebellides shetlandica Parapar, Moreira &amp; O'Reilly, 2016 (species 1; ZMBN 116186) B Terebellides lavesquei sp. nov. (species 5; holotype, ZMBN 116322) C Terebellides atlantis Williams, 1984 (species 16; ZMBN 116472) D Terebellides irinae Gagaev, 2009 (species 24; ZMBN 116498) E Terebellides williamsae Jirkov, 1989 (species 2; ZMBN 116269) F Terebellides gracilis Malm, 1874 (species 3; ZMBN 116283). Abbreviations: bdl - branchial dorsal lobe; bf - branchial filament; bvl - branchial ventral lobe; ooc - oocytes; wTC - white thoracic chaetiger." figureDoi="10.3897/zookeys.1132.91244.figure3" httpUri="https://binary.pensoft.net/fig/775019" pageId="0" pageNumber="85">3A-C</figureCitation>
). Lateral lappets and dorsal projections of notopodia in anterior thoracic chaetigers with different degree of development depending on size and preservation conditions, but both more conspicuous on TC 1-4 (Fig. 
<figureCitation captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. STM photographs of several Terebellides species (A, C-F non-type specimens) A Terebellides shetlandica Parapar, Moreira &amp; O'Reilly, 2016 (species 1; ZMBN 116186) B Terebellides lavesquei sp. nov. (species 5; holotype, ZMBN 116322) C Terebellides atlantis Williams, 1984 (species 16; ZMBN 116472) D Terebellides irinae Gagaev, 2009 (species 24; ZMBN 116498) E Terebellides williamsae Jirkov, 1989 (species 2; ZMBN 116269) F Terebellides gracilis Malm, 1874 (species 3; ZMBN 116283). Abbreviations: bdl - branchial dorsal lobe; bf - branchial filament; bvl - branchial ventral lobe; ooc - oocytes; wTC - white thoracic chaetiger." figureDoi="10.3897/zookeys.1132.91244.figure3" httpUri="https://binary.pensoft.net/fig/775019" pageId="0" pageNumber="85">3A-C</figureCitation>
). All notochaetae as simple capillaries (Fig. 
<figureCitation captionStart="Figure 5" captionStartId="F5" captionText="Figure 5. Terebellides shetlandica Parapar, Moreira &amp; O'Reilly, 2016 (species 1; non-type specimens, ZMBN 116181, ZMBN 116204 and ZMBN 116219), SEM micrographs A anterior end, dorsal view B anterior end, left lateral view C TC 6 (TU 1), geniculate chaeta D thoracic uncinus E abdominal neuropodium F abdominal uncini. Abbreviations: bdl - branchial dorsal lobe; bf - branchial filament; bvl - branchial ventral lobe; cap - capitium; cop - copepod; dpn - dorsal projection of notopodium; TC - thoracic chaetiger; tll - thoracic lateral lobes; tm - tentacular membrane; TU - thoracic unciniger." figureDoi="10.3897/zookeys.1132.91244.figure5" httpUri="https://binary.pensoft.net/fig/775021" pageId="0" pageNumber="85">5B</figureCitation>
). Size of notochaetae of TC 1 similar to subsequent ones. Neuropodia as sessile pinnules from TC 6 to body end, with uncini in single or double rows, from TC 7 throughout. Neuropodia on TC 6, provided with several sharply bent, acute-tipped, geniculate chaetae with minute teeth forming a capitium only visible with SEM (Figs 
<figureCitation captionStart="Figure 5" captionStartId="F5" captionText="Figure 5. Terebellides shetlandica Parapar, Moreira &amp; O'Reilly, 2016 (species 1; non-type specimens, ZMBN 116181, ZMBN 116204 and ZMBN 116219), SEM micrographs A anterior end, dorsal view B anterior end, left lateral view C TC 6 (TU 1), geniculate chaeta D thoracic uncinus E abdominal neuropodium F abdominal uncini. Abbreviations: bdl - branchial dorsal lobe; bf - branchial filament; bvl - branchial ventral lobe; cap - capitium; cop - copepod; dpn - dorsal projection of notopodium; TC - thoracic chaetiger; tll - thoracic lateral lobes; tm - tentacular membrane; TU - thoracic unciniger." figureDoi="10.3897/zookeys.1132.91244.figure5" httpUri="https://binary.pensoft.net/fig/775021" pageId="0" pageNumber="85">5C</figureCitation>
, 
<figureCitation captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Terebellides lavesquei sp. nov. (non-type specimens, NTNU-VM 61387 and ZMBN 116332), SEM micrographs A TC 6 (TU 1), geniculate chaetae B thoracic uncini C double row of thoracic uncini D abdominal uncini. Abbreviations: cap - capitium; TC - thoracic chaetiger; TU - thoracic unciniger." figureDoi="10.3897/zookeys.1132.91244.figure7" httpUri="https://binary.pensoft.net/fig/775023" pageId="0" pageNumber="85">7A</figureCitation>
, 
<figureCitation captionStart="Figure 8" captionStartId="F8" captionText="Figure 8. Terebellides atlantis Williams, 1984 (species 16; non-type specimens, ZMBN 116454 and ZMBN 116459), SEM micrographs A anterior end, left lateral view B branchiae, detail C TC 6 (TU 1), geniculate chaetae D thoracic uncini E abdominal neuropodium F abdominal uncini. Abbreviations: bf - branchial filament; bvl - branchial ventral lobe; cap - capitium; dpn - dorsal projection of notopodium; TC - thoracic chaetiger; TU - thoracic unciniger." figureDoi="10.3897/zookeys.1132.91244.figure8" httpUri="https://binary.pensoft.net/fig/775024" pageId="0" pageNumber="85">8C</figureCitation>
). From TC 7, neuropodia with one or several rows of uncini per torus (Figs 
<figureCitation captionStart="Figure 5" captionStartId="F5" captionText="Figure 5. Terebellides shetlandica Parapar, Moreira &amp; O'Reilly, 2016 (species 1; non-type specimens, ZMBN 116181, ZMBN 116204 and ZMBN 116219), SEM micrographs A anterior end, dorsal view B anterior end, left lateral view C TC 6 (TU 1), geniculate chaeta D thoracic uncinus E abdominal neuropodium F abdominal uncini. Abbreviations: bdl - branchial dorsal lobe; bf - branchial filament; bvl - branchial ventral lobe; cap - capitium; cop - copepod; dpn - dorsal projection of notopodium; TC - thoracic chaetiger; tll - thoracic lateral lobes; tm - tentacular membrane; TU - thoracic unciniger." figureDoi="10.3897/zookeys.1132.91244.figure5" httpUri="https://binary.pensoft.net/fig/775021" pageId="0" pageNumber="85">5D</figureCitation>
, 
<figureCitation captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Terebellides lavesquei sp. nov. (non-type specimens, NTNU-VM 61387 and ZMBN 116332), SEM micrographs A TC 6 (TU 1), geniculate chaetae B thoracic uncini C double row of thoracic uncini D abdominal uncini. Abbreviations: cap - capitium; TC - thoracic chaetiger; TU - thoracic unciniger." figureDoi="10.3897/zookeys.1132.91244.figure7" httpUri="https://binary.pensoft.net/fig/775023" pageId="0" pageNumber="85">7B, C</figureCitation>
, 
<figureCitation captionStart="Figure 8" captionStartId="F8" captionText="Figure 8. Terebellides atlantis Williams, 1984 (species 16; non-type specimens, ZMBN 116454 and ZMBN 116459), SEM micrographs A anterior end, left lateral view B branchiae, detail C TC 6 (TU 1), geniculate chaetae D thoracic uncini E abdominal neuropodium F abdominal uncini. Abbreviations: bf - branchial filament; bvl - branchial ventral lobe; cap - capitium; dpn - dorsal projection of notopodium; TC - thoracic chaetiger; TU - thoracic unciniger." figureDoi="10.3897/zookeys.1132.91244.figure8" httpUri="https://binary.pensoft.net/fig/775024" pageId="0" pageNumber="85">8D</figureCitation>
), with long shafted denticulate hooks, with large main fang (rostrum) longer than upper crest of teeth (capitium), rostrum/capitium length ratio of ~ 2:1, capitium composed by several teeth above main fang of decreasing length (Figs 
<figureCitation captionStart="Figure 5" captionStartId="F5" captionText="Figure 5. Terebellides shetlandica Parapar, Moreira &amp; O'Reilly, 2016 (species 1; non-type specimens, ZMBN 116181, ZMBN 116204 and ZMBN 116219), SEM micrographs A anterior end, dorsal view B anterior end, left lateral view C TC 6 (TU 1), geniculate chaeta D thoracic uncinus E abdominal neuropodium F abdominal uncini. Abbreviations: bdl - branchial dorsal lobe; bf - branchial filament; bvl - branchial ventral lobe; cap - capitium; cop - copepod; dpn - dorsal projection of notopodium; TC - thoracic chaetiger; tll - thoracic lateral lobes; tm - tentacular membrane; TU - thoracic unciniger." figureDoi="10.3897/zookeys.1132.91244.figure5" httpUri="https://binary.pensoft.net/fig/775021" pageId="0" pageNumber="85">5D</figureCitation>
, 
<figureCitation captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Terebellides lavesquei sp. nov. (non-type specimens, NTNU-VM 61387 and ZMBN 116332), SEM micrographs A TC 6 (TU 1), geniculate chaetae B thoracic uncini C double row of thoracic uncini D abdominal uncini. Abbreviations: cap - capitium; TC - thoracic chaetiger; TU - thoracic unciniger." figureDoi="10.3897/zookeys.1132.91244.figure7" httpUri="https://binary.pensoft.net/fig/775023" pageId="0" pageNumber="85">7B</figureCitation>
, 
<figureCitation captionStart="Figure 8" captionStartId="F8" captionText="Figure 8. Terebellides atlantis Williams, 1984 (species 16; non-type specimens, ZMBN 116454 and ZMBN 116459), SEM micrographs A anterior end, left lateral view B branchiae, detail C TC 6 (TU 1), geniculate chaetae D thoracic uncini E abdominal neuropodium F abdominal uncini. Abbreviations: bf - branchial filament; bvl - branchial ventral lobe; cap - capitium; dpn - dorsal projection of notopodium; TC - thoracic chaetiger; TU - thoracic unciniger." figureDoi="10.3897/zookeys.1132.91244.figure8" httpUri="https://binary.pensoft.net/fig/775024" pageId="0" pageNumber="85">8D</figureCitation>
).
</paragraph>
<caption doi="10.3897/zookeys.1132.91244.figure4" httpUri="https://binary.pensoft.net/fig/775020" pageId="0" pageNumber="85" start="Figure 4" startId="F4">
<paragraph pageId="0" pageNumber="85">
<emphasis bold="true" pageId="0" pageNumber="85">Figure 4.</emphasis>
Line drawings of several 
<taxonomicName class="Polychaeta" family="Trichobranchidae" genus="Terebellides" kingdom="Animalia" lsidName="Terebellides" order="Canalipalpata" pageId="0" pageNumber="85" phylum="Annelida" rank="genus">
<emphasis italics="true" pageId="0" pageNumber="85">Terebellides</emphasis>
</taxonomicName>
species (
<emphasis bold="true" pageId="0" pageNumber="85">A, C, D</emphasis>
non-type specimens) 
<emphasis bold="true" pageId="0" pageNumber="85">A</emphasis>
<taxonomicName authorityName="Parapar, Moreira &amp; O'Reilly" authorityYear="2016" class="Polychaeta" family="Trichobranchidae" genus="Terebellides" kingdom="Animalia" lsidName="Terebellides shetlandica" order="Canalipalpata" pageId="0" pageNumber="85" phylum="Annelida" rank="species" species="shetlandica">
<emphasis italics="true" pageId="0" pageNumber="85">Terebellides shetlandica</emphasis>
</taxonomicName>
Parapar, Moreira &amp; 
<normalizedToken originalValue="O’Reilly">O'Reilly</normalizedToken>
, 2016 (species 1; ZMBN116186), anterior end, right lateral view 
<emphasis bold="true" pageId="0" pageNumber="85">B</emphasis>
<taxonomicName authorityName="Barroso &amp; Moreira &amp; Capa &amp; Nygren &amp; Parapar" authorityYear="2022" class="Polychaeta" family="Trichobranchidae" genus="Terebellides" kingdom="Animalia" lsidName="Terebellides lavesquei" order="Canalipalpata" pageId="0" pageNumber="85" phylum="Annelida" rank="species" species="lavesquei">
<emphasis italics="true" pageId="0" pageNumber="85">Terebellides lavesquei</emphasis>
</taxonomicName>
sp. nov. (holotype; ZMBN116322), anterior end, left lateral view 
<emphasis bold="true" pageId="0" pageNumber="85">C</emphasis>
<taxonomicName authorityName="Gagaev" authorityYear="2009" class="Polychaeta" family="Trichobranchidae" genus="Terebellides" kingdom="Animalia" lsidName="Terebellides irinae" order="Canalipalpata" pageId="0" pageNumber="85" phylum="Annelida" rank="species" species="irinae">
<emphasis italics="true" pageId="0" pageNumber="85">Terebellides irinae</emphasis>
</taxonomicName>
Gagaev, 2009 (species 24; ZMBN116498), anterior end, ventral view 
<emphasis bold="true" pageId="0" pageNumber="85">D</emphasis>
<taxonomicName authorityName="Malm" authorityYear="1874" class="Polychaeta" family="Trichobranchidae" genus="Terebellides" kingdom="Animalia" lsidName="Terebellides gracilis" order="Canalipalpata" pageId="0" pageNumber="85" phylum="Annelida" rank="species" species="gracilis">
<emphasis italics="true" pageId="0" pageNumber="85">Terebellides gracilis</emphasis>
</taxonomicName>
Malm, 1874 (species 3; ZMBN116283), anterior end, right lateral view. Abbreviations: bdl - branchial dorsal lobe; bf - branchial filament; bvl - branchial ventral lobe; tm - tentacular membrane.
</paragraph>
</caption>
<caption doi="10.3897/zookeys.1132.91244.figure5" httpUri="https://binary.pensoft.net/fig/775021" pageId="0" pageNumber="85" start="Figure 5" startId="F5">
<paragraph pageId="0" pageNumber="85">
<emphasis bold="true" pageId="0" pageNumber="85">Figure 5.</emphasis>
<taxonomicName authorityName="Parapar, Moreira &amp; O'Reilly" authorityYear="2016" class="Polychaeta" family="Trichobranchidae" genus="Terebellides" kingdom="Animalia" lsidName="Terebellides shetlandica" order="Canalipalpata" pageId="0" pageNumber="85" phylum="Annelida" rank="species" species="shetlandica">
<emphasis italics="true" pageId="0" pageNumber="85">Terebellides shetlandica</emphasis>
</taxonomicName>
Parapar, Moreira &amp; 
<normalizedToken originalValue="O’Reilly">O'Reilly</normalizedToken>
, 2016 (species 1; non-type specimens, ZMBN116181, ZMBN116204 and ZMBN116219), SEM micrographs 
<emphasis bold="true" pageId="0" pageNumber="85">A</emphasis>
anterior end, dorsal view 
<emphasis bold="true" pageId="0" pageNumber="85">B</emphasis>
anterior end, left lateral view 
<emphasis bold="true" pageId="0" pageNumber="85">C</emphasis>
TC 6 (TU1), geniculate chaeta 
<emphasis bold="true" pageId="0" pageNumber="85">D</emphasis>
thoracic uncinus 
<emphasis bold="true" pageId="0" pageNumber="85">E</emphasis>
abdominal neuropodium 
<emphasis bold="true" pageId="0" pageNumber="85">F</emphasis>
abdominal uncini. Abbreviations: bdl - branchial dorsal lobe; bf - branchial filament; bvl - branchial ventral lobe; cap - capitium; cop - copepod; dpn - dorsal projection of notopodium; TC - thoracic chaetiger; tll - thoracic lateral lobes; tm - tentacular membrane; TU - thoracic unciniger.
</paragraph>
</caption>
<caption doi="10.3897/zookeys.1132.91244.figure6" httpUri="https://binary.pensoft.net/fig/775022" pageId="0" pageNumber="85" start="Figure 6" startId="F6">
<paragraph pageId="0" pageNumber="85">
<emphasis bold="true" pageId="0" pageNumber="85">Figure 6.</emphasis>
<taxonomicName authorityName="Barroso &amp; Moreira &amp; Capa &amp; Nygren &amp; Parapar" authorityYear="2022" class="Polychaeta" family="Trichobranchidae" genus="Terebellides" kingdom="Animalia" lsidName="Terebellides lavesquei" order="Canalipalpata" pageId="0" pageNumber="85" phylum="Annelida" rank="species" species="lavesquei">
<emphasis italics="true" pageId="0" pageNumber="85">Terebellides lavesquei</emphasis>
</taxonomicName>
sp. nov. (non-type specimen, ZMBN116332), SEM micrographs 
<emphasis bold="true" pageId="0" pageNumber="85">A</emphasis>
anterior end, left lateral view 
<emphasis bold="true" pageId="0" pageNumber="85">B</emphasis>
branchial lamellae, detail 
<emphasis bold="true" pageId="0" pageNumber="85">C</emphasis>
ciliary row, detail 
<emphasis bold="true" pageId="0" pageNumber="85">D</emphasis>
copepod 
<emphasis bold="true" pageId="0" pageNumber="85">E</emphasis>
copepod, anterior end. Abbreviations: bdl - branchial dorsal lobe; bf - branchial filament; cop - copepod; cr - ciliary row.
</paragraph>
</caption>
<caption doi="10.3897/zookeys.1132.91244.figure7" httpUri="https://binary.pensoft.net/fig/775023" pageId="0" pageNumber="85" start="Figure 7" startId="F7">
<paragraph pageId="0" pageNumber="85">
<emphasis bold="true" pageId="0" pageNumber="85">Figure 7.</emphasis>
<taxonomicName authorityName="Barroso &amp; Moreira &amp; Capa &amp; Nygren &amp; Parapar" authorityYear="2022" class="Polychaeta" family="Trichobranchidae" genus="Terebellides" kingdom="Animalia" lsidName="Terebellides lavesquei" order="Canalipalpata" pageId="0" pageNumber="85" phylum="Annelida" rank="species" species="lavesquei">
<emphasis italics="true" pageId="0" pageNumber="85">Terebellides lavesquei</emphasis>
</taxonomicName>
sp. nov. (non-type specimens, NTNU-VM61387 and ZMBN116332), SEM micrographs 
<emphasis bold="true" pageId="0" pageNumber="85">A</emphasis>
TC 6 (TU1), geniculate chaetae 
<emphasis bold="true" pageId="0" pageNumber="85">B</emphasis>
thoracic uncini 
<emphasis bold="true" pageId="0" pageNumber="85">C</emphasis>
double row of thoracic uncini 
<emphasis bold="true" pageId="0" pageNumber="85">D</emphasis>
abdominal uncini. Abbreviations: cap - capitium; TC - thoracic chaetiger; TU - thoracic unciniger.
</paragraph>
</caption>
<caption doi="10.3897/zookeys.1132.91244.figure8" httpUri="https://binary.pensoft.net/fig/775024" pageId="0" pageNumber="85" start="Figure 8" startId="F8">
<paragraph pageId="0" pageNumber="85">
<emphasis bold="true" pageId="0" pageNumber="85">Figure 8.</emphasis>
<taxonomicName authorityName="Williams" authorityYear="1984" class="Polychaeta" family="Trichobranchidae" genus="Terebellides" kingdom="Animalia" lsidName="Terebellides atlantis" order="Canalipalpata" pageId="0" pageNumber="85" phylum="Annelida" rank="species" species="atlantis">
<emphasis italics="true" pageId="0" pageNumber="85">Terebellides atlantis</emphasis>
</taxonomicName>
Williams, 1984 (species 16; non-type specimens, ZMBN116454 and ZMBN116459), SEM micrographs 
<emphasis bold="true" pageId="0" pageNumber="85">A</emphasis>
anterior end, left lateral view 
<emphasis bold="true" pageId="0" pageNumber="85">B</emphasis>
branchiae, detail 
<emphasis bold="true" pageId="0" pageNumber="85">C</emphasis>
TC 6 (TU1), geniculate chaetae 
<emphasis bold="true" pageId="0" pageNumber="85">D</emphasis>
thoracic uncini 
<emphasis bold="true" pageId="0" pageNumber="85">E</emphasis>
abdominal neuropodium 
<emphasis bold="true" pageId="0" pageNumber="85">F</emphasis>
abdominal uncini. Abbreviations: bf - branchial filament; bvl - branchial ventral lobe; cap - capitium; dpn - dorsal projection of notopodium; TC - thoracic chaetiger; TU - thoracic unciniger.
</paragraph>
</caption>
<paragraph pageId="0" pageNumber="85">
<emphasis bold="true" pageId="0" pageNumber="85">
<emphasis italics="true" pageId="0" pageNumber="85">Abdomen and pygidium</emphasis>
.
</emphasis>
Approximately half as long as thorax and progressively thinner (Fig. 
<figureCitation captionStart="Figure 2" captionStartId="F2" captionText="Figure 2. STM photographs of live specimens of several Terebellides species (non-type specimens) A, B Terebellides shetlandica Parapar, Moreira &amp; O'Reilly, 2016 (species 1; A ZMBN 116171 B ZMBN 116181) C Terebellides lavesquei sp. nov. (species 5; GNM 15112) D, E Terebellides williamsae Jirkov, 1989 (species 2; D GNM 15108 E GNM 15109) F Terebellides gracilis Malm, 1874 (species 3; GNM 15111). Abbreviations: bdl - branchial dorsal lobe; bf - branchial filament; bvl - branchial ventral lobe; ooc - oocytes; wTC - white thoracic chaetiger." figureDoi="10.3897/zookeys.1132.91244.figure2" httpUri="https://binary.pensoft.net/fig/775018" pageId="0" pageNumber="85">2A-C</figureCitation>
). Neuropodia ranging from 18-34 chaetigers and forming erect pinnules (Figs 
<figureCitation captionStart="Figure 5" captionStartId="F5" captionText="Figure 5. Terebellides shetlandica Parapar, Moreira &amp; O'Reilly, 2016 (species 1; non-type specimens, ZMBN 116181, ZMBN 116204 and ZMBN 116219), SEM micrographs A anterior end, dorsal view B anterior end, left lateral view C TC 6 (TU 1), geniculate chaeta D thoracic uncinus E abdominal neuropodium F abdominal uncini. Abbreviations: bdl - branchial dorsal lobe; bf - branchial filament; bvl - branchial ventral lobe; cap - capitium; cop - copepod; dpn - dorsal projection of notopodium; TC - thoracic chaetiger; tll - thoracic lateral lobes; tm - tentacular membrane; TU - thoracic unciniger." figureDoi="10.3897/zookeys.1132.91244.figure5" httpUri="https://binary.pensoft.net/fig/775021" pageId="0" pageNumber="85">5E</figureCitation>
, 
<figureCitation captionStart="Figure 8" captionStartId="F8" captionText="Figure 8. Terebellides atlantis Williams, 1984 (species 16; non-type specimens, ZMBN 116454 and ZMBN 116459), SEM micrographs A anterior end, left lateral view B branchiae, detail C TC 6 (TU 1), geniculate chaetae D thoracic uncini E abdominal neuropodium F abdominal uncini. Abbreviations: bf - branchial filament; bvl - branchial ventral lobe; cap - capitium; dpn - dorsal projection of notopodium; TC - thoracic chaetiger; TU - thoracic unciniger." figureDoi="10.3897/zookeys.1132.91244.figure8" httpUri="https://binary.pensoft.net/fig/775024" pageId="0" pageNumber="85">8E</figureCitation>
) with several uncini per torus, number depending on specimen size. Uncini provided with several teeth above rostrum surmounted by a capitium composed of several teeth of decreasing length (Figs 
<figureCitation captionStart="Figure 5" captionStartId="F5" captionText="Figure 5. Terebellides shetlandica Parapar, Moreira &amp; O'Reilly, 2016 (species 1; non-type specimens, ZMBN 116181, ZMBN 116204 and ZMBN 116219), SEM micrographs A anterior end, dorsal view B anterior end, left lateral view C TC 6 (TU 1), geniculate chaeta D thoracic uncinus E abdominal neuropodium F abdominal uncini. Abbreviations: bdl - branchial dorsal lobe; bf - branchial filament; bvl - branchial ventral lobe; cap - capitium; cop - copepod; dpn - dorsal projection of notopodium; TC - thoracic chaetiger; tll - thoracic lateral lobes; tm - tentacular membrane; TU - thoracic unciniger." figureDoi="10.3897/zookeys.1132.91244.figure5" httpUri="https://binary.pensoft.net/fig/775021" pageId="0" pageNumber="85">5F</figureCitation>
, 
<figureCitation captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Terebellides lavesquei sp. nov. (non-type specimens, NTNU-VM 61387 and ZMBN 116332), SEM micrographs A TC 6 (TU 1), geniculate chaetae B thoracic uncini C double row of thoracic uncini D abdominal uncini. Abbreviations: cap - capitium; TC - thoracic chaetiger; TU - thoracic unciniger." figureDoi="10.3897/zookeys.1132.91244.figure7" httpUri="https://binary.pensoft.net/fig/775023" pageId="0" pageNumber="85">7D</figureCitation>
, 
<figureCitation captionStart="Figure 8" captionStartId="F8" captionText="Figure 8. Terebellides atlantis Williams, 1984 (species 16; non-type specimens, ZMBN 116454 and ZMBN 116459), SEM micrographs A anterior end, left lateral view B branchiae, detail C TC 6 (TU 1), geniculate chaetae D thoracic uncini E abdominal neuropodium F abdominal uncini. Abbreviations: bf - branchial filament; bvl - branchial ventral lobe; cap - capitium; dpn - dorsal projection of notopodium; TC - thoracic chaetiger; TU - thoracic unciniger." figureDoi="10.3897/zookeys.1132.91244.figure8" httpUri="https://binary.pensoft.net/fig/775024" pageId="0" pageNumber="85">8F</figureCitation>
). Pygidium blunt, as funnel-like depression.
</paragraph>
<paragraph pageId="0" pageNumber="85">
<emphasis bold="true" pageId="0" pageNumber="85">
<emphasis italics="true" pageId="0" pageNumber="85">Colour pattern</emphasis>
.
</emphasis>
Colour in preserved specimens whitish or pale brown (Fig. 
<figureCitation captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. STM photographs of several Terebellides species (A, C-F non-type specimens) A Terebellides shetlandica Parapar, Moreira &amp; O'Reilly, 2016 (species 1; ZMBN 116186) B Terebellides lavesquei sp. nov. (species 5; holotype, ZMBN 116322) C Terebellides atlantis Williams, 1984 (species 16; ZMBN 116472) D Terebellides irinae Gagaev, 2009 (species 24; ZMBN 116498) E Terebellides williamsae Jirkov, 1989 (species 2; ZMBN 116269) F Terebellides gracilis Malm, 1874 (species 3; ZMBN 116283). Abbreviations: bdl - branchial dorsal lobe; bf - branchial filament; bvl - branchial ventral lobe; ooc - oocytes; wTC - white thoracic chaetiger." figureDoi="10.3897/zookeys.1132.91244.figure3" httpUri="https://binary.pensoft.net/fig/775019" pageId="0" pageNumber="85">3A-C</figureCitation>
). MG staining pattern characterised by 1) compact green colourant in SG 1-6, then turning into striped pattern in SG 7-14 and fading in following segments or 2) by compact green colourant in SG 1-6, J-shaped glandular region in SG 3-5, and striped pattern in SG 7-14 (Fig. 
<figureCitation captionStart="Figure 12" captionStartId="F12" captionText="Figure 12. Body MG staining patterns in ventral view of Terebellides species. Terebellides shetlandica Parapar, Moreira &amp; O'Reilly, 2016, Terebellides lavesquei sp. nov., Terebellides atlantis Williams, 1984, Terebellides irinae Gagaev, 2009, Terebellides williamsae Jirkov, 1989 and Terebellides gracilis Malm, 1874. Segments indicated in Arabic numbers." figureDoi="10.3897/zookeys.1132.91244.figure12" httpUri="https://binary.pensoft.net/fig/775028" pageId="0" pageNumber="85">12</figureCitation>
).
</paragraph>
</subSubSection>
<subSubSection pageId="0" pageNumber="85" type="remarks">
<paragraph pageId="0" pageNumber="85">Remarks.</paragraph>
<paragraph pageId="0" pageNumber="85">
Among the aforementioned characters, branchial features might serve to distinguish most of Group B species from those of Groups A, C, and D. Those include size of branchial lobes, lobes not fused, presence of long filaments on ventral ones, and presence of ciliary rows on branchial lamellae. Other taxa described or reported worldwide bear the same type of branchiae (type 3), including 
<taxonomicName authorityName="McIntosh" authorityYear="1885" class="Polychaeta" family="Trichobranchidae" genus="Terebellides" kingdom="Animalia" lsidName="Terebellides ehlersi" order="Canalipalpata" pageId="0" pageNumber="85" phylum="Annelida" rank="species" species="ehlersi">
<emphasis italics="true" pageId="0" pageNumber="85">Terebellides ehlersi</emphasis>
</taxonomicName>
McIntosh, 1885, 
<taxonomicName class="Polychaeta" kingdom="Animalia" lsidName="T. intoshi" pageId="0" pageNumber="85" phylum="Annelida" rank="species" species="intoshi">
<emphasis italics="true" pageId="0" pageNumber="85">T. intoshi</emphasis>
</taxonomicName>
Caullery, 1915, 
<taxonomicName class="Polychaeta" kingdom="Animalia" lsidName="T. lobatus" pageId="0" pageNumber="85" phylum="Annelida" rank="species" species="lobatus">
<emphasis italics="true" pageId="0" pageNumber="85">T. lobatus</emphasis>
</taxonomicName>
Hartman &amp; Fauchald, 1971, 
<taxonomicName class="Polychaeta" kingdom="Animalia" lsidName="T. mundora" pageId="0" pageNumber="85" phylum="Annelida" rank="species" species="mundora">
<emphasis italics="true" pageId="0" pageNumber="85">T. mundora</emphasis>
</taxonomicName>
Hutchings &amp; Peart, 2000 and 
<taxonomicName class="Polychaeta" kingdom="Animalia" lsidName="T. sepultura" pageId="0" pageNumber="85" phylum="Annelida" rank="species" species="sepultura">
<emphasis italics="true" pageId="0" pageNumber="85">T. sepultura</emphasis>
</taxonomicName>
Garraffoni &amp; Lana, 2003 (
<bibRefCitation DOI="https://doi.org/10.1007/s12526-015-0353-5" author="Parapar, J" journalOrPublisher="Marine Biodiversity" pageId="0" pageNumber="85" pagination="211 - 225" refId="B30" refString="Parapar, J, Moreira, J, O'Reilly, M, 2016a. A new species of Terebellides (Polychaeta: Trichobranchidae) from Scottish waters with an insight into branchial morphology. Marine Biodiversity 46 (1): 211 - 225, DOI: https://doi.org/10.1007/s12526-015-0353-5" title="A new species of Terebellides (Polychaeta: Trichobranchidae) from Scottish waters with an insight into branchial morphology." url="https://doi.org/10.1007/s12526-015-0353-5" volume="46" year="2016 a">Parapar et al. 2016a</bibRefCitation>
, 
<bibRefCitation DOI="https://doi.org/10.7717/peerj.2313" author="Parapar, J" journalOrPublisher="Marine Biodiversity" pageId="0" pageNumber="85" refId="B31" refString="Parapar, J, Moreira, J, Martin, D, 2016b. On the diversity of the SE Indo-Pacific species of Terebellides (Annelida; Trichobranchidae), with the description of a new species. PeerJ 4: e2313. https://doi.org/10.7717/peerj.2313" title="On the diversity of the SE Indo-Pacific species of Terebellides (Annelida; Trichobranchidae), with the description of a new species. PeerJ 4: e 2313." url="https://doi.org/10.7717/peerj.2313" year="2016 b">b</bibRefCitation>
).
</paragraph>
</subSubSection>
</treatment>
</document>