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153 lines
15 KiB
XML
<document ID-DOI="http://dx.doi.org/10.3897/zookeys.759.22981" ID-GBIF-Dataset="7ad14f09-86a1-4caa-8a2d-8972874e9652" ID-PMC="PMC6055549" ID-Pensoft-Pub="1313-2970-759-29" ID-PubMed="30046274" ID-ZBK="A7645CBDF29D4F99A2C5709197B95F28" ModsDocAuthor="" ModsDocDate="2018" ModsDocID="1313-2970-759-29" ModsDocOrigin="ZooKeys 759" ModsDocTitle="Three new species of Thelepus Leuckart, 1849 from Europe and a re-description of T.cincinnatus (Fabricius, 1780) (Annelida, Terebellidae)" checkinTime="1526640557497" checkinUser="pensoft" docAuthor="Jirkov, Igor" docDate="2018" docId="949C129D649A6D96CE8C04F1BC64C02D" docLanguage="en" docName="ZooKeys 759: 29-56" docOrigin="ZooKeys 759" docSource="http://dx.doi.org/10.3897/zookeys.759.22981" docTitle="Thelepus marthae Jirkov, 2018, sp. n." docType="treatment" docUuid="10A8FCD4-3C8D-4B71-B5C6-341403C7F10E" docUuidSource="ZooBank" docVersion="5" lastPageNumber="29" masterDocId="6C25466C285AFF892121FFE9FFCD2606" masterDocTitle="Three new species of Thelepus Leuckart, 1849 from Europe and a re-description of T. cincinnatus (Fabricius, 1780) (Annelida, Terebellidae)" masterLastPageNumber="56" masterPageNumber="29" pageNumber="29" updateTime="1668165806169" updateUser="ExternalLinkService">
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<mods:mods xmlns:mods="http://www.loc.gov/mods/v3">
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<mods:titleInfo>
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<mods:title>Three new species of Thelepus Leuckart, 1849 from Europe and a re-description of T. cincinnatus (Fabricius, 1780) (Annelida, Terebellidae)</mods:title>
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</mods:titleInfo>
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<mods:name type="personal">
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<mods:role>
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<mods:roleTerm>Author</mods:roleTerm>
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</mods:role>
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<mods:namePart>Jirkov, Igor</mods:namePart>
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</mods:name>
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<mods:typeOfResource>text</mods:typeOfResource>
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<mods:relatedItem type="host">
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<mods:titleInfo>
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<mods:title>ZooKeys</mods:title>
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</mods:titleInfo>
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<mods:part>
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<mods:date>2018</mods:date>
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<mods:detail type="volume">
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<mods:number>759</mods:number>
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</mods:detail>
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<mods:extent unit="page">
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<mods:start>29</mods:start>
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<mods:end>56</mods:end>
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</mods:extent>
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</mods:part>
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</mods:relatedItem>
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<mods:location>
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<mods:url>http://dx.doi.org/10.3897/zookeys.759.22981</mods:url>
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</mods:location>
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<mods:classification>journal article</mods:classification>
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<mods:identifier type="DOI">http://dx.doi.org/10.3897/zookeys.759.22981</mods:identifier>
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<mods:identifier type="Pensoft-Pub">1313-2970-759-29</mods:identifier>
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<mods:identifier type="ZBK">A7645CBDF29D4F99A2C5709197B95F28</mods:identifier>
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<mods:identifier type="ZooBank">A7645CBDF29D4F99A2C5709197B95F28</mods:identifier>
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</mods:mods>
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<treatment ID-GBIF-Taxon="144037489" LSID="urn:lsid:zoobank.org:act:10A8FCD4-3C8D-4B71-B5C6-341403C7F10E" httpUri="http://treatment.plazi.org/id/949C129D649A6D96CE8C04F1BC64C02D" lastPageNumber="29" pageId="0" pageNumber="29">
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<subSubSection pageId="0" pageNumber="29" type="nomenclature">
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<paragraph pageId="0" pageNumber="29">
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<taxonomicName LSID="http://zoobank.org/10A8FCD4-3C8D-4B71-B5C6-341403C7F10E" class="Polychaeta" family="Terebellidae" genus="Thelepus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Thelepus marthae" order="Terebellida" pageId="0" pageNumber="29" phylum="Annelida" rank="species" species="marthae">Thelepus marthae</taxonomicName>
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<taxonomicNameLabel pageId="0" pageNumber="29">sp. n.</taxonomicNameLabel>
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Figs 6, 7, 11C
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</paragraph>
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</subSubSection>
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<subSubSection pageId="0" pageNumber="29" type="reference_group">
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<paragraph pageId="0" pageNumber="29">
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<taxonomicName class="Polychaeta" family="Terebellidae" genus="Thelepus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Thelepus cincinnatus" order="Terebellida" pageId="0" pageNumber="29" phylum="Annelida" rank="species" species="cincinnatus">Thelepus cincinnatus</taxonomicName>
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:
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<bibRefCitation pageId="0" pageNumber="29">Zatsepin 1948</bibRefCitation>
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: 154, table XXXVIII, 7 (partim);
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<bibRefCitation author="Jirkov, IA" journalOrPublisher="Yanus-K, Moskva" pageId="0" pageNumber="29" title="[Polychaeta of the Arctic Ocean]." year="2001">Jirkov 2001</bibRefCitation>
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: 526-527 (partim) - non
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<bibRefCitation author="Fabricius, O" journalOrPublisher="Journal of the Linnean Society of London, Zoology" pageId="0" pageNumber="29" url="http://dx.doi.org/10.5962/bhl.title.13489" year="1780">Fabricius 1780</bibRefCitation>
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.
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</paragraph>
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</subSubSection>
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<subSubSection pageId="0" pageNumber="29" type="materials_examined">
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<paragraph pageId="0" pageNumber="29">Material</paragraph>
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<paragraph pageId="0" pageNumber="29">(Table 1): 921 specimens from 38 stations collected from depths between 95-1,510 m, bottom temperature -1.84-2.8 °C. Holotype: R/V Tunetz cruise 105 station 6. Material is deposited at the KGB, fifteen paratypes from Alaid st. 6 are deposited at MNCN 16.01/17773, seven paratypes are deposited at ZIN 1/33266.</paragraph>
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</subSubSection>
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<subSubSection pageId="0" pageNumber="29" type="description">
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<paragraph pageId="0" pageNumber="29">Description</paragraph>
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<paragraph pageId="0" pageNumber="29">(based on holotype and paratypes). Holotype with 81 segments, 55 segments with notopodia, 55 mm length. Paratypes up to 80 mm in length, 6-7 mm in width, 100 segments, last segments still in formation and clustered, not fully developed, with poorly-developed neuropodia, so not possible to count total number of segments.</paragraph>
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<paragraph pageId="0" pageNumber="29">
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Several tens of buccal tentacles, their length in fixed specimens equal to half of body length. Eyespots absent (Fig. 6
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<normalizedToken originalValue="A–C">A-C</normalizedToken>
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). BS1 with up to ten filaments (seven in holotype); BS2 with up to five (four in holotype) (Fig. 6F, H). Number of filaments increases with worm size; smallest worms, width <1 mm, with either no branchiae or with 1-2 filaments on BS1 and none on BS2. However, maximum number of filaments constant in different samples (containing sufficient worms) despite a range of maximum worm sizes across the samples. For example, largest worms from sample SP-22 st. 60 are at least three times larger than those from sample Alaid st. 3, but maximum number of filaments observed is same. Branchial filaments of BS1 extend laterally from level of notopodia of C1, to a maximum level with upper margin of uncinal row of U1. Filaments attached in a single row on an elevated stump. A wide medial gap separates left and right groups of filaments. Lateral lobes absent. Barely visible nephridial papillae on S4-S7 above neuropodia (Fig. 6A, B arrowed), in most specimens, few papillae visible, usually none. Ventrum glandular, with
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<normalizedToken originalValue="“wrinkling”">"wrinkling"</normalizedToken>
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(Fig. 4B) increasing with worm size (Fig. 6G).
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</paragraph>
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<caption pageId="0" pageNumber="29">
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<paragraph pageId="0" pageNumber="29">
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Figure 6.
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<taxonomicName class="Polychaeta" family="Terebellidae" genus="Thelepus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Thelepus marthae" order="Terebellida" pageId="0" pageNumber="29" phylum="Annelida" rank="species" species="marthae">Thelepus marthae</taxonomicName>
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sp. n. external morphology.
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<normalizedToken originalValue="A–C">A-C</normalizedToken>
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lateral view of anterior end (arrowed nephridial papillae) D detail of anterior end, showing pigmented eyespots E lateral view of posterior end (arrowed last segment with notochaetae) F, H dorsal view of anterior end G ventral view of anterior end. ASP-22 st.60 B, F, G holotype C, H Alaid 30.3 D, ESP-22 st. 72. Scale bars: 1 mm. All worms but D stained with methylene blue.
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</paragraph>
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</caption>
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<paragraph pageId="0" pageNumber="29">Notopodia from S3, anterior notopodia almost cylindrical. Notopodia on C1, often C2, and sometimes C3 two to three times smaller than most developed notopodia (app. C10), sometimes one notopodium on C1 absent (Sevastopol 1358). Most developed notopodia transversally flattened, then reduced in size and become cylindrical again. In the most posterior segments notopodia very small; notochaetae present but several times shorter than most developed ones with no more than 10 per ramus; neuropodia also reduced to small pinnuli with few uncini. Notochaetae absent in 20-40 developing segments near pygidium (Fig. 6E); exact number difficult to determine as both annulation and neuropodia poorly developed. Some specimens also without notopodia on the 10-20 preceding reasonably well-developed segments. Number of segments with notopodia around 60 (in few complete worms available for this species), with several posterior segments lacking notopodia. However, segments without notopodia form only ca. 10% of the total worm length. Notochaetae of anterior segments two to three times longer than notochaetae of posterior segments. Notochaetae in two transverse rows: anterior row with short chaetae, distal half (winged part) becomes stained with methylene blue, posterior row with long chaetae. Notochaetae with narrow brims (Fig. 11C).</paragraph>
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<paragraph pageId="0" pageNumber="29">
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Neuropodia from C3; tori increasing in size to U10, then becoming progressively slightly shorter. Uncini in single row. Uncini of U1 with well-developed prow and crest with one tooth in profile (Fig. 7A,
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<normalizedToken originalValue="C–E">C-E</normalizedToken>
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), posterior uncini (U20 from pygidium) very similar (Fig. 7B).
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</paragraph>
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<caption pageId="0" pageNumber="29">
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<paragraph pageId="0" pageNumber="29">
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Figure 7.
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<taxonomicName class="Polychaeta" family="Terebellidae" genus="Thelepus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Thelepus marthae" order="Terebellida" pageId="0" pageNumber="29" phylum="Annelida" rank="species" species="marthae">Thelepus marthae</taxonomicName>
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sp. n. uncini. A, B - Tunetz 105.6 C, D Alaid 30.3 ESP-22 60. A,
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<normalizedToken originalValue="C–E">C-E</normalizedToken>
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uncini of U1 B uncini of U20 from the pygidium. Each block from one specimen. Scale bars: 20
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<normalizedToken originalValue="μm">μm</normalizedToken>
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.
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</paragraph>
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</caption>
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<paragraph pageId="0" pageNumber="29">Pygidium with crenulated margin without cirri or papillae (Fig. 6E).</paragraph>
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</subSubSection>
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<subSubSection pageId="0" pageNumber="29" type="differential diagnosis">
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<paragraph pageId="0" pageNumber="29">Differential diagnosis.</paragraph>
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<paragraph pageId="0" pageNumber="29">
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Only one previously known species,
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<taxonomicName lsidName="T. pascua" pageId="0" pageNumber="29" rank="species" species="pascua">T. pascua</taxonomicName>
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(Fauchald, 1977) from the Caribbean coast of Panama, has two pairs of branchiae and no eyespots. It differs from
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<taxonomicName lsidName="T. marthae" pageId="0" pageNumber="29" rank="species" species="marthae">T. marthae</taxonomicName>
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in the lower number of branchial filaments: single filament in BS1 and BS2 in
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<taxonomicName lsidName="T. pascua" pageId="0" pageNumber="29" rank="species" species="pascua">T. pascua</taxonomicName>
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; up to 20 filaments in BS1 and up to 10 filaments in
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<taxonomicName lsidName="T. marthae" pageId="0" pageNumber="29" rank="species" species="marthae">T. marthae</taxonomicName>
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.
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<taxonomicName class="Polychaeta" family="Terebellidae" genus="Thelepus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Thelepus marthae" order="Terebellida" pageId="0" pageNumber="29" phylum="Annelida" rank="species" species="marthae">Thelepus marthae</taxonomicName>
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differs from
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<taxonomicName lsidName="T. davehalli" pageId="0" pageNumber="29" rank="species" species="davehalli">T. davehalli</taxonomicName>
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(described above) in the typically observed absence of fully developed segments without notopodia; if present, they form no more than 10% of the body length.
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<taxonomicName class="Polychaeta" family="Terebellidae" genus="Thelepus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Thelepus marthae" order="Terebellida" pageId="0" pageNumber="29" phylum="Annelida" rank="species" species="marthae">Thelepus marthae</taxonomicName>
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differs from
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<taxonomicName lsidName="T. crassibranchiatus" pageId="0" pageNumber="29" rank="species" species="crassibranchiatus">T. crassibranchiatus</taxonomicName>
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Treadwell, 1901,
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<taxonomicName lsidName="T. hamatus" pageId="0" pageNumber="29" rank="species" species="hamatus">T. hamatus</taxonomicName>
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Moore, 1905 and
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<taxonomicName lsidName="T. pascua" pageId="0" pageNumber="29" rank="species" species="pascua">T. pascua</taxonomicName>
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(Fauchald, 1977) (which have eyespots) in the higher number of branchial filaments and segments with notopodia.
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<taxonomicName class="Polychaeta" family="Terebellidae" genus="Thelepus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Thelepus marthae" order="Terebellida" pageId="0" pageNumber="29" phylum="Annelida" rank="species" species="marthae">Thelepus marthae</taxonomicName>
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differs from
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<taxonomicName lsidName="T. cincinnatus" pageId="0" pageNumber="29" rank="species" species="cincinnatus">T. cincinnatus</taxonomicName>
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and
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<taxonomicName lsidName="T. antarcticus" pageId="0" pageNumber="29" rank="species" species="antarcticus">T. antarcticus</taxonomicName>
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in the lower number of branchial filaments and segments with notopodia.
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<taxonomicName class="Polychaeta" family="Terebellidae" genus="Thelepus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Thelepus marthae" order="Terebellida" pageId="0" pageNumber="29" phylum="Annelida" rank="species" species="marthae">Thelepus marthae</taxonomicName>
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differs from
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<taxonomicName lsidName="T. parapari" pageId="0" pageNumber="29" rank="species" species="parapari">T. parapari</taxonomicName>
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in the shape of its uncini.
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</paragraph>
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</subSubSection>
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<subSubSection pageId="0" pageNumber="29" type="remarks">
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<paragraph pageId="0" pageNumber="29">Remark.</paragraph>
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<paragraph pageId="0" pageNumber="29">
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One specimen (SP-22 st. 72) has numerous spots (Fig. 6D); together forming a transverse row, as with typical eyespots but, in this case, each individual spot is longitudinal instead of rounded as in
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<taxonomicName lsidName="T. cincinnatus" pageId="0" pageNumber="29" rank="species" species="cincinnatus">T. cincinnatus</taxonomicName>
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(Fig. 2B) and other
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<taxonomicName family="Terebellidae" lsidName="" pageId="0" pageNumber="29" rank="family">Terebellidae</taxonomicName>
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. These spots are in the same place as eyespots, but their very unusual shape makes their interpretation as eyespots doubtful; other interpretations are possible.
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</paragraph>
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</subSubSection>
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<subSubSection pageId="0" pageNumber="29" type="etymology">
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<paragraph pageId="0" pageNumber="29">Etymology.</paragraph>
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<paragraph pageId="0" pageNumber="29">Species is named after my friend Dr. Martha K. Leontovich (Fig. 8); she has described several new terebellid species.</paragraph>
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<caption pageId="0" pageNumber="29">
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<paragraph pageId="0" pageNumber="29">Figure 8. Dr. Martha K. Leontovich. The photograph was taken by the author.</paragraph>
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</caption>
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</subSubSection>
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</treatment>
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</document> |