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<mods:title id="AAEA684F28F500983037E6AD5F7D31DA">On some lesser known sea cucumbers in the Natural History Museum, UK (Echinodermata: Holothuroidea)</mods:title>
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<paragraph id="8B9A36F3BF6FFF93FF50FB5D7DBF6498" blockId="8.[151,943,1232,1295]" box="[151,943,1232,1260]" pageId="8" pageNumber="369">
<heading id="D0D2819FBF6FFF93FF50FB5D7DBF6498" bold="true" box="[151,943,1232,1260]" fontSize="11" level="1" pageId="8" pageNumber="369" reason="1">
<emphasis id="B951EAE1BF6FFF93FF50FB5D7DBF6498" bold="true" box="[151,943,1232,1260]" pageId="8" pageNumber="369">
<taxonomicName id="4C254D70BF6FFF93FF50FB5D7EE2649F" ID-CoL="7Q4FF" authorityName="Oken" authorityYear="1815" box="[151,242,1233,1260]" class="Holothuroidea" family="Phyllophoridae" genus="Thyone" kingdom="Animalia" order="Dendrochirotida" pageId="8" pageNumber="369" phylum="Echinodermata" rank="genus">
<emphasis id="B951EAE1BF6FFF93FF50FB5D7EE2649F" bold="true" box="[151,242,1233,1260]" italics="true" pageId="8" pageNumber="369">Thyone</emphasis>
</taxonomicName>
?
<taxonomicName id="4C254D70BF6FFF93FECFFB5D7C0D6498" authority="Norman, 1869" authorityName="Norman" authorityYear="1869" box="[264,541,1233,1260]" class="Holothuroidea" family="Phyllophoridae" genus="Thyone" kingdom="Animalia" order="Dendrochirotida" pageId="8" pageNumber="369" phylum="Echinodermata" rank="species" species="elegans">
<emphasis id="B951EAE1BF6FFF93FECFFB5D7F73649F" bold="true" box="[264,355,1233,1260]" italics="true" pageId="8" pageNumber="369">elegans</emphasis>
<bibRefCitation id="EFB44B02BF6FFF93FEACFB5D7C0D6498" author="Norman, A. M." box="[363,541,1233,1259]" pageId="8" pageNumber="369" pagination="47 - 336" refId="ref12062" refString="Norman, A. M. (1869) Shetland final dredging report ii. On the Crustacea, Tunicata, Polyzoa, Echinodermata, Actinozoa, Hydrozoa and Porifera. Report of the British Association of the Advancement of Science, 1869, 47 - 336." type="journal article" year="1869">Norman, 1869</bibRefCitation>
</taxonomicName>
or
<emphasis id="B951EAE1BF6FFF93FD81FB5D7C486498" bold="true" box="[582,600,1233,1259]" italics="true" pageId="8" pageNumber="369">T</emphasis>
.?
<taxonomicName id="4C254D70BF6FFF93FDB1FB5D7DBF6498" authority="Herouard, 1889" authorityName="Herouard" authorityYear="1889" box="[630,943,1232,1259]" class="Holothuroidea" family="Phyllophoridae" genus="Thyone" kingdom="Animalia" order="Dendrochirotida" pageId="8" pageNumber="369" phylum="Echinodermata" rank="species" species="roscovita">
<emphasis id="B951EAE1BF6FFF93FDB1FB5D7CF36498" bold="true" box="[630,739,1233,1259]" italics="true" pageId="8" pageNumber="369">roscovita</emphasis>
<bibRefCitation id="EFB44B02BF6FFF93FD2DFB5C7DBF6498" author="Herouard, R." box="[746,943,1232,1259]" pageId="8" pageNumber="369" pagination="535 - 704" refId="ref11494" refString="Herouard, R. (1889) Recherches sur les holothuries des cotes de France. Archives de Zoologie Experimentale et Generale, 2, 535 - 704." type="journal article" year="1889">Hérouard, 1889</bibRefCitation>
</taxonomicName>
</emphasis>
</heading>
</paragraph>
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<subSubSection id="C33F6578BF6FFF93FF50FB797F69657C" box="[151,377,1269,1295]" pageId="8" pageNumber="369" type="description">
<paragraph id="8B9A36F3BF6FFF93FF50FB797F69657C" blockId="8.[151,943,1232,1295]" box="[151,377,1269,1295]" pageId="8" pageNumber="369">
<figureCitation id="131E2A76BF6FFF93FF50FB797EE5657C" box="[151,245,1269,1295]" captionStart="FIGURE 4" captionStartId="7.[151,250,1943,1968]" captionTargetBox="[151,1338,722,1915]" captionTargetId="figure@7.[151,1338,722,1923]" captionTargetPageId="7" captionText="FIGURE 4. A. Thyone?elegans / T.?roscovita (ex Isle of Muck), specimen entire; B. Aquapharyngeal bulb of?Thyone sp. (ex St Marys Scilly Island); C. Calcareous ring of Thyone?elegans / T.?roscovita (ex Isle of Muck); D. Calcareous ring of Thyone sp.; E. Tube feet end-plates of Thyone?elegans / T.?roscovita (ex Isle of Muck). MDIR = mid-dorsal interradial plate." figureDoi="http://doi.org/10.5281/zenodo.3516799" httpUri="https://zenodo.org/record/3516799/files/figure.png" pageId="8" pageNumber="369">Figure 4</figureCitation>
(A, C &amp; E)
</paragraph>
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<subSubSection id="C33F6578BF6FFF93FF50FAB57D9B6503" pageId="8" pageNumber="369" type="reference_group">
<paragraph id="8B9A36F3BF6FFF93FF50FAB57C046522" blockId="8.[151,907,1336,1392]" box="[151,532,1336,1361]" pageId="8" pageNumber="369">
<treatmentCitationGroup id="AB3511DDBF6FFF93FF50FAB57C046522" box="[151,532,1336,1361]" pageId="8" pageNumber="369">
?
<taxonomicName id="4C254D70BF6FFF93FF65FAB57C006522" ID-CoL="6bf926fd-4c09-42cd-a4d9-9980fafa0da3" authority="Norman, 1869: 317" authorityName="Norman" authorityPageNumber="317" authorityYear="1869" box="[162,528,1336,1361]" class="Holothuroidea" family="Phyllophoridae" genus="Thyone" kingdom="Animalia" order="Dendrochirotida" pageId="8" pageNumber="369" phylum="Echinodermata" rank="species" species="elegans">
<emphasis id="B951EAE1BF6FFF93FF65FAB57F506522" box="[162,320,1337,1361]" italics="true" pageId="8" pageNumber="369">Thyone elegans</emphasis>
<treatmentCitation id="0A8410E2BF6FFF93FE80FAB67C006522" author="Norman, A. M." box="[327,528,1336,1361]" page="317" pageId="8" pageNumber="369" year="1869">
<bibRefCitation id="EFB44B02BF6FFF93FE80FAB67C006522" author="Norman, A. M." box="[327,528,1336,1361]" pageId="8" pageNumber="369" pagination="47 - 336" refId="ref12062" refString="Norman, A. M. (1869) Shetland final dredging report ii. On the Crustacea, Tunicata, Polyzoa, Echinodermata, Actinozoa, Hydrozoa and Porifera. Report of the British Association of the Advancement of Science, 1869, 47 - 336." type="journal article" year="1869">Norman, 1869: 317</bibRefCitation>
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.
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</paragraph>
<paragraph id="8B9A36F3BF6FFF93FF50FAD47D9B6503" blockId="8.[151,907,1336,1392]" box="[151,907,1367,1392]" pageId="8" pageNumber="369">
<treatmentCitationGroup id="AB3511DDBF6FFF93FF50FAD47D9B6503" box="[151,907,1367,1392]" pageId="8" pageNumber="369">
?
<taxonomicName id="4C254D70BF6FFF93FF65FAD47C3C6503" ID-CoL="56RNR" authority="Herouard, 1889: 682" authorityName="Herouard" authorityPageNumber="682" authorityYear="1889" box="[162,556,1367,1392]" class="Holothuroidea" family="Phyllophoridae" genus="Thyone" kingdom="Animalia" order="Dendrochirotida" pageId="8" pageNumber="369" phylum="Echinodermata" rank="species" species="roscovita">
<emphasis id="B951EAE1BF6FFF93FF65FAD47F406503" box="[162,336,1368,1392]" italics="true" pageId="8" pageNumber="369">Thyone roscovita</emphasis>
<treatmentCitation id="0A8410E2BF6FFF93FE90FADB7C3C6503" author="Herouard, R." box="[343,556,1367,1392]" page="682" pageId="8" pageNumber="369" year="1889">
<bibRefCitation id="EFB44B02BF6FFF93FE90FADB7C3C6503" author="Herouard, R." box="[343,556,1367,1392]" pageId="8" pageNumber="369" pagination="535 - 704" refId="ref11494" refString="Herouard, R. (1889) Recherches sur les holothuries des cotes de France. Archives de Zoologie Experimentale et Generale, 2, 535 - 704." type="journal article" year="1889">Hérouard, 1889: 682</bibRefCitation>
</treatmentCitation>
</taxonomicName>
;
<bibRefCitation id="EFB44B02BF6FFF93FDF0FADB7CF06503" author="McKenzie, J. D." box="[567,736,1367,1392]" pageId="8" pageNumber="369" pagination="123 - 171" refId="ref11951" refString="McKenzie, J. D. (1991) The taxonomy and natural history of north European dendrochirote holothurians (Echinodermata). Journal of Natural History, 25 (1), 123 - 171. https: // doi. org / 10.1080 / 00222939100770091" type="journal article" year="1991">McKenzie, 1991</bibRefCitation>
(syn. complete).
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</paragraph>
</subSubSection>
<subSubSection id="C33F6578BF6FFF93FF50FA117C8365AE" pageId="8" pageNumber="369" type="materials_examined">
<paragraph id="8B9A36F3BF6FFF93FF50FA117C8365AE" blockId="8.[151,1437,1437,2041]" pageId="8" pageNumber="369">
<emphasis id="B951EAE1BF6FFF93FF50FA117F9165CB" bold="true" box="[151,385,1437,1464]" pageId="8" pageNumber="369">Material examined.</emphasis>
Isle of Muck, Rudha leam na Caraiche (perhaps Lubh Leam na Lá Rudha ceam na Caraich), littoral,
<date id="FF9B1033BF6FFF93FF37FA4E7F4F65AF" box="[240,351,1474,1500]" pageId="8" pageNumber="369" value="1938-07-27">27.VII.38</date>
, A.D.H. Collection,
<specimenCount id="9D23FD7ABF6FFF93FD83FA4E7C8365AE" box="[580,659,1474,1501]" pageId="8" pageNumber="369" type="generic">1 spec.</specimenCount>
</paragraph>
</subSubSection>
<subSubSection id="C33F6578BF6FFF93FF00FA697AD967A7" pageId="8" pageNumber="369" type="description">
<paragraph id="8B9A36F3BF6FFF93FF00FA697AD967A7" blockId="8.[151,1437,1437,2041]" pageId="8" pageNumber="369">
<emphasis id="B951EAE1BF6FFF93FF00FA697F496673" bold="true" box="[199,345,1509,1536]" pageId="8" pageNumber="369">Description.</emphasis>
Body form cylindrical, vermiform, with posterior end slightly curved. Length
<quantity id="4CDD9B16BF6FFF93FB09FA697B0F6672" box="[1230,1311,1509,1537]" metricMagnitude="-2" metricUnit="m" metricValue="5.5" pageId="8" pageNumber="369" unit="mm" value="55.0">55 mm</quantity>
, breadth in mid-body
<quantity id="4CDD9B16BF6FFF93FECCF9867F4D6656" box="[267,349,1546,1573]" metricMagnitude="-2" metricUnit="m" metricValue="1.0" pageId="8" pageNumber="369" unit="mm" value="10.0">10 mm</quantity>
. Tentacles 10, ventral two reduced. Skin and tentacles off-white in alcohol. Tentacles very bushy, including the two reduced ones. Calcareous ring and introvert eviscerated but still attached to body by retractor muscles. Mouth and anus terminal, non-calcified minute anal papillae evident. Hardly any distinction between dorsal and ventral surfaces. Tube feet short, scattered, but more numerous in ambulacra than elsewhere, some serial arrangement evident. Calcareous ring typically tubular, elongated, complex, somewhat twisted. Both radial and interradial plates fragmented, fused, anteriorly triangular, radials with a depression for attachment of retractor muscle. Radial plates prolonged posteriorly before bifurcating into fragmented processes which infringe on the anterior part of the gut (stomach), processes approximately one-third the length of ring. Polian vesicle single, elongated. Stone canals two, delicate, proximally straight, distally coiled, ending in a bean-shaped madreporite. Gonad immature, tubules unbranched, long, thin, restricted to mid-body. Longitudinal muscles as single strands. Retractor muscles thick and tough, the three ventral ones arising more anteriorly, proximally thin but widening distally before insertion onto radial plates. Except for a few fragmented multilocular, smooth periproctal plates, no ossicles detected in any part of the body, except for scattered fragmented/reduced/corroded end plates in some tube feet.
</paragraph>
</subSubSection>
<subSubSection id="C33F6578BF6FFF92FF00F8527C9261F9" lastPageId="9" lastPageNumber="370" pageId="8" pageNumber="369" type="discussion">
<paragraph id="8B9A36F3BF6FFF92FF00F8527C9261F9" blockId="8.[151,1437,1437,2041]" lastBlockId="9.[151,1437,152,395]" lastPageId="9" lastPageNumber="370" pageId="8" pageNumber="369">
<emphasis id="B951EAE1BF6FFF93FF00F8527F2B678B" bold="true" box="[199,315,2014,2040]" pageId="8" pageNumber="369">Remarks.</emphasis>
This specimen is identified as
<taxonomicName id="4C254D70BF6FFF93FD5FF8527DDB678B" authority="Herouard" authorityName="Herouard" authorityYear="1889" box="[664,971,2014,2040]" class="Holothuroidea" family="Phyllophoridae" genus="Thyone" kingdom="Animalia" order="Dendrochirotida" pageId="8" pageNumber="369" phylum="Echinodermata" rank="species" species="roscovita">
<emphasis id="B951EAE1BF6FFF93FD5FF8527D49678B" box="[664,857,2014,2040]" italics="true" pageId="8" pageNumber="369">Thyone roscovita</emphasis>
Hérouard
</taxonomicName>
by A.D. Hobson perhaps based on McK- enzies (1991) suspicion. However, the label inside the original jar states Hebrons
<taxonomicName id="4C254D70BF6EFF92FBEAFF147A6F60C1" authorityName="Oken" authorityYear="1815" box="[1069,1151,152,178]" class="Holothuroidea" family="Phyllophoridae" genus="Thyone" kingdom="Animalia" order="Dendrochirotida" pageId="9" pageNumber="370" phylum="Echinodermata" rank="genus">
<emphasis id="B951EAE1BF6EFF92FBEAFF147A6F60C1" box="[1069,1151,152,178]" italics="true" pageId="9" pageNumber="370">Thyone</emphasis>
</taxonomicName>
but the writer was unable to ascertain what was implied by this label. Because of the presence of some anal plates and tube feet end plates, the writer with some hesitation, agrees with Hobsons identification that the specimen represents
<taxonomicName id="4C254D70BF6EFF92FB03FF6D7B586089" authorityName="Herouard" authorityYear="1889" box="[1220,1352,225,250]" class="Holothuroidea" family="Phyllophoridae" genus="Thyone" kingdom="Animalia" order="Dendrochirotida" pageId="9" pageNumber="370" phylum="Echinodermata" rank="species" species="roscovita">
<emphasis id="B951EAE1BF6EFF92FB03FF6D7B586089" box="[1220,1352,225,250]" italics="true" pageId="9" pageNumber="370">T. roscovita</emphasis>
</taxonomicName>
, which according to
<bibRefCitation id="EFB44B02BF6EFF92FEEAFE887FE4616C" author="McKenzie, J. D." box="[301,500,260,287]" pageId="9" pageNumber="370" pagination="123 - 171" refId="ref11951" refString="McKenzie, J. D. (1991) The taxonomy and natural history of north European dendrochirote holothurians (Echinodermata). Journal of Natural History, 25 (1), 123 - 171. https: // doi. org / 10.1080 / 00222939100770091" type="journal article" year="1991">McKenzie (1991)</bibRefCitation>
is perhaps a junior synonym of
<taxonomicName id="4C254D70BF6EFF92FCAFFE897DCB616D" authorityName="Norman" authorityYear="1869" box="[872,987,260,286]" class="Holothuroidea" family="Phyllophoridae" genus="Thyone" kingdom="Animalia" order="Dendrochirotida" pageId="9" pageNumber="370" phylum="Echinodermata" rank="species" species="elegans">
<emphasis id="B951EAE1BF6EFF92FCAFFE897DCB616D" box="[872,987,260,286]" italics="true" pageId="9" pageNumber="370">T. elegans</emphasis>
</taxonomicName>
. This is discussed in some detail under remarks above. I have no reason not to support this synonymisation. However, the presence of a calcareous ring with the radials prolonged before bifurcation and two stone canals suggest that this specimen may be a juvenile and identical to the
<taxonomicName id="4C254D70BF6EFF92FE82FEFC7F8761F9" authorityName="Oken" authorityYear="1815" box="[325,407,368,394]" class="Holothuroidea" family="Phyllophoridae" genus="Thyone" kingdom="Animalia" order="Dendrochirotida" pageId="9" pageNumber="370" phylum="Echinodermata" rank="genus">
<emphasis id="B951EAE1BF6EFF92FE82FEFC7F8761F9" box="[325,407,368,394]" italics="true" pageId="9" pageNumber="370">Thyone</emphasis>
</taxonomicName>
sp. described above.
</paragraph>
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