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<document id="49D63ABFDC11B363359151D909F0DC97" ID-CLB-Dataset="7081" ID-DOI="10.11646/zootaxa.4963.3.6" ID-GBIF-Dataset="3dab0d02-d6ed-45ef-8589-5cb984fec302" ID-ISSN="1175-5326" ID-Zenodo-Dep="4704429" ID-ZooBank="341ED174-5781-4C37-8D0C-8045C90FA369" IM.bibliography_approvedBy="felipe" IM.materialsCitations_approvedBy="felipe" IM.metadata_approvedBy="felipe" IM.tables_requiresApprovalFor="existingObjects" IM.taxonomicNames_approvedBy="felipe" IM.treatmentCitations_approvedBy="felipe" IM.treatments_approvedBy="felipe" checkinTime="1618907051145" checkinUser="plazi" docAuthor="Stöhr, Sabine &amp; O’Hara, Timothy D." docDate="2021" docId="039A87CC62664F31FF11FCBB5DB753B0" docLanguage="en" docName="zootaxa.4963.3.6.pdf" docOrigin="Zootaxa 4963 (3)" docStyle="DocumentStyle:647186512141C8FC8976D5BCC54AEB7D.9:Zootaxa.2013-.journal_article" docStyleId="647186512141C8FC8976D5BCC54AEB7D" docStyleName="Zootaxa.2013-.journal_article" docStyleVersion="9" docTitle="Silax abditus" docType="treatment" docVersion="6" lastPageNumber="527" masterDocId="FFA3FFB462724F27FF86FFD55F2C5775" masterDocTitle="Deep-sea Ophiuroidea (Echinodermata) from the Danish Galathea II Expedition 1950 - 52, with taxonomic revisions" masterLastPageNumber="529" masterPageNumber="505" pageNumber="525" updateTime="1698938916263" updateUser="ExternalLinkService" zenodo-license-document="CLOSED">
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<mods:title id="200022E80C7123DF93E81A8FDB3B6329">Deep-sea Ophiuroidea (Echinodermata) from the Danish Galathea II Expedition 1950 - 52, with taxonomic revisions</mods:title>
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<mods:namePart id="72FF1799816A5598884DFD842A2BD076">Stöhr, Sabine</mods:namePart>
<mods:affiliation id="F334DC3D8368027B5C9D13285738BD95">Swedish Museum of Natural History, Dept. of Zoology, Box 50007, 10405 Stockholm, Sweden.</mods:affiliation>
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<mods:namePart id="93CBD93A53C548B5F3C2EA5A1FF223FE">O’Hara, Timothy D.</mods:namePart>
<mods:affiliation id="C7A430694BB8096F1E6B5C1CDC294D9B">Museums Victoria, Sciences, GPO Box 666, Melbourne, Victoria 3000, Australia.</mods:affiliation>
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<mods:date id="B635B8D8FFC03DBD02325AA744BB1D7D">2021</mods:date>
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<mods:identifier id="3AE7C86CF2362308ED133EBECE08CB66" type="CLB-Dataset">7081</mods:identifier>
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<treatment id="039A87CC62664F31FF11FCBB5DB753B0" ID-DOI="http://doi.org/10.5281/zenodo.4740545" ID-GBIF-Taxon="212429044" ID-Zenodo-Dep="4740545" LSID="urn:lsid:plazi:treatment:039A87CC62664F31FF11FCBB5DB753B0" httpUri="http://treatment.plazi.org/id/039A87CC62664F31FF11FCBB5DB753B0" lastPageId="22" lastPageNumber="527" pageId="20" pageNumber="525">
<subSubSection id="C329655162664F33FF11FCBB5E7654FC" box="[151,346,878,905]" pageId="20" pageNumber="525" type="nomenclature">
<paragraph id="8B8C36DA62664F33FF11FCBB5E7654FC" blockId="20.[151,346,878,905]" box="[151,346,878,905]" pageId="20" pageNumber="525">
<heading id="D0C481B662664F33FF11FCBB5E7654FC" bold="true" box="[151,346,878,905]" fontSize="11" level="1" pageId="20" pageNumber="525" reason="1">
<taxonomicName id="4C334D5962664F33FF11FCBB5E7654FC" ID-CoL="874MQ" baseAuthorityName="A. M Clark" baseAuthorityYear="1970" box="[151,346,878,905]" class="Ophiuroidea" family="Amphiuridae" genus="Silax" higherTaxonomySource="CoL" isUncertain="true" kingdom="Animalia" order="Amphilepidida" pageId="20" pageNumber="525" phylum="Echinodermata" rank="species" species="abditus">
<emphasis id="B947EAC862664F33FF11FCBB5E7654FC" bold="true" box="[151,346,878,905]" pageId="20" pageNumber="525">
<emphasis id="B947EAC862664F33FF11FCBB5FF954FC" bold="true" box="[151,213,878,905]" italics="true" pageId="20" pageNumber="525">Silax</emphasis>
cf.
<emphasis id="B947EAC862664F33FE84FCBB5E7654FC" bold="true" box="[258,346,878,905]" italics="true" pageId="20" pageNumber="525">abditus</emphasis>
</emphasis>
</taxonomicName>
</heading>
</paragraph>
</subSubSection>
<subSubSection id="C329655162664F33FF11FC615FD954BA" box="[151,245,948,975]" pageId="20" pageNumber="525" type="description">
<paragraph id="8B8C36DA62664F33FF11FC615FD954BA" blockId="20.[151,245,948,975]" box="[151,245,948,975]" pageId="20" pageNumber="525">
<figureCitation id="13082A5F62664F33FF11FC615FD954BA" box="[151,245,948,975]" captionStart="FIGURE 5" captionStartId="21.[151,250,1782,1806]" captionTargetBox="[151,1435,181,1758]" captionTargetId="figure-17@21.[151,1435,181,1758]" captionTargetPageId="21" captionText="FIGURE 5. Silax cf. abdita, Galathea II stn. 716, from lot NHMD-868859. A, dorsal disc section, B, dorsal arm, C, central dorsal disc, D, dorsolateral arm, E, ventral aspect, F, jaws with madreporite, G, proximal ventral arm, H, dorsal disc, I, ventral aspect, J, dorsal arm, K, lateral proximal arm. A–G, SEM images, SMNH-189206, 189209, I–K, digital photos of dried speci- men, NHMD-868700. AdS, adoral shield, CPP, central primary plate, DAP, dorsal arm plate, IPa, infradental papillae, LAP, lateral arm plate, M, madreporite, OPa, oral papillae, OS, oral shield, VAP, ventral arm plate. Scale bars = 1 mm." figureDoi="http://doi.org/10.5281/zenodo.4740565" httpUri="https://zenodo.org/record/4740565/files/figure.png" pageId="20" pageNumber="525">Figure 5</figureCitation>
</paragraph>
</subSubSection>
<subSubSection id="C329655162664F33FF11FC2C5AAE53EB" pageId="20" pageNumber="525" type="materials_examined">
<paragraph id="8B8C36DA62664F33FF11FC2C5EA95366" blockId="20.[151,389,1017,1043]" box="[151,389,1017,1043]" pageId="20" pageNumber="525">
<emphasis id="B947EAC862664F33FF11FC2C5EA95366" bold="true" box="[151,389,1017,1043]" pageId="20" pageNumber="525">Material examined</emphasis>
</paragraph>
<paragraph id="8B8C36DA62664F33FF11FBEA5AAE53EB" blockId="20.[151,1437,1086,1183]" pageId="20" pageNumber="525">
<materialsCitation id="3B5B3C8762664F33FF11FBEA5B48530E" ID-GBIF-Occurrence="4173687354" latitude="9.383333" longitude="-89.53333" pageId="20" pageNumber="525">
<collectionCode id="ED22AE1F62664F33FF11FBEA5FF0532C" box="[151,220,1087,1113]" pageId="20" pageNumber="525">EAST</collectionCode>
PACIFIC OCEAN •&gt;
<specimenCount id="9D35FD5362664F33FE51FBEA5D53532C" box="[471,639,1087,1113]" pageId="20" pageNumber="525" type="generic">100 specimens</specimenCount>
; off
<collectingCountry id="F324764A62664F33FD29FBEA5C0A532C" box="[687,806,1087,1113]" name="Nicaragua" pageId="20" pageNumber="525">Nicaragua</collectingCountry>
;
<geoCoordinate id="EE07501D62664F33FCA9FBEA5CBE532C" box="[815,914,1087,1113]" degrees="09" direction="north" minutes="23" orientation="latitude" pageId="20" pageNumber="525" precision="925" value="9.383333">09°23’N</geoCoordinate>
,
<geoCoordinate id="EE07501D62664F33FC1BFBEA5B38532C" box="[925,1044,1087,1113]" degrees="089" direction="west" minutes="32" orientation="longitude" pageId="20" pageNumber="525" precision="925" value="-89.53333">089°32’W</geoCoordinate>
;
<quantity id="4CCB9B3F62664F33FB99FBEB5B59532C" box="[1055,1141,1086,1113]" metricMagnitude="3" metricUnit="m" metricValue="3.57" pageId="20" pageNumber="525" unit="m" value="3570.0">3570 m</quantity>
;
<date id="FF8D101A62664F33FB06FBEA5A3A532C" box="[1152,1302,1086,1113]" pageId="20" pageNumber="525" value="1952-05-06">06 May 1952</date>
; Galathea II stn. 716; dark, muddish, clay; NHMD-86700, 868859, SMNH-186206, SMNH-186209
</materialsCitation>
<materialsCitation id="3B5B3C8762664F33FBECFBB75AAE53EB" ID-GBIF-Occurrence="4173687302" latitude="5.7333336" longitude="-79.5" pageId="20" pageNumber="525">
•
<specimenCount id="9D35FD5362664F33FBFDFBB45A2B530E" box="[1147,1287,1121,1147]" pageId="20" pageNumber="525" type="generic">4 specimens</specimenCount>
; Gulf of
<collectingCountry id="F324764A62664F33FAEFFBB75FE553EA" name="Panama" pageId="20" pageNumber="525">Panama</collectingCountry>
;
<geoCoordinate id="EE07501D62664F33FF53FB515E1453EA" box="[213,312,1156,1183]" degrees="05" direction="north" minutes="44" orientation="latitude" pageId="20" pageNumber="525" precision="925" value="5.7333336">05°44’N</geoCoordinate>
,
<geoCoordinate id="EE07501D62664F33FEC5FB515E9753EB" box="[323,443,1156,1182]" degrees="079" direction="west" minutes="30" orientation="longitude" pageId="20" pageNumber="525" precision="925" value="-79.5">079°30’W</geoCoordinate>
;
<quantity id="4CCB9B3F62664F33FE40FB515D4853EA" box="[454,612,1156,1183]" metricMagnitude="3" metricUnit="m" metricValue="3.07" metricValueMax="3.19" metricValueMin="2.95" pageId="20" pageNumber="525" unit="m" value="3070.0" valueMax="3190.0" valueMin="2950.0">2950–3190 m</quantity>
;
<date id="FF8D101A62664F33FDF6FB515C2453EA" box="[624,776,1156,1183]" pageId="20" pageNumber="525" value="1952-05-12">12 May 1952</date>
; Galathea II stn. 724; dark clay, stones; NHMD-868701.
</materialsCitation>
</paragraph>
</subSubSection>
<subSubSection id="C329655162664F31FF11FB395A2E56D8" lastPageId="22" lastPageNumber="527" pageId="20" pageNumber="525" type="description">
<paragraph id="8B8C36DA62664F33FF11FB395EB95273" blockId="20.[151,405,1260,1286]" box="[151,405,1260,1286]" pageId="20" pageNumber="525">
<heading id="D0C481B662664F33FF11FB395EB95273" bold="true" box="[151,405,1260,1286]" fontSize="11" level="1" pageId="20" pageNumber="525" reason="1">
<emphasis id="B947EAC862664F33FF11FB395EB95273" bold="true" box="[151,405,1260,1286]" pageId="20" pageNumber="525">Descriptive remarks</emphasis>
</heading>
</paragraph>
<paragraph id="8B8C36DA62664F33FF11FAE45A36528C" blockId="20.[151,1437,1329,1843]" pageId="20" pageNumber="525">
Disc diameter
<quantity id="4CCB9B3F62664F33FEBFFAE45EAB5239" box="[313,391,1329,1356]" metricMagnitude="-2" metricUnit="m" metricValue="1.6" pageId="20" pageNumber="525" unit="mm" value="16.0">16 mm</quantity>
arms missing, except for short proximal parts, complete length unknown. Dorsal disc covered by numerous small round scales, six larger plates in disc centre probably primary rosette widely separated by scales, devoid of granules or thorns. Radial shields semicircular, proximal end slightly narrower than distal, pairs separated by several disc scales, distally connecting. Dorsal arm plates oval, twice as wide as long, consecutive plates separated by lateral plates. Up to eight arm spines proximally, middle spines longest, tapering pointed, smooth, slightly longer than a segment. Articular structures for spines on lateral arm plates with bent parallel lobes, of amphiurid
<typeStatus id="5488887862664F33FB65FA0A5A3A528C" box="[1251,1302,1503,1529]" pageId="20" pageNumber="525">type</typeStatus>
.
</paragraph>
<paragraph id="8B8C36DA62664F33FF41F9D45B725046" blockId="20.[151,1437,1329,1843]" pageId="20" pageNumber="525">Ventral disc covered by small round scales similar to dorsal disc. Bursal slits slightly longer than half interradius length, abradial edge lined by larger scales. Jaws with stout block-like infradental papillae below the wide, straight-edged teeth. Lateral oral papillae comprised of two wide scales (possibly modified adoral shield spines), and between these and the infradentals the tip of the buccal scale, extending from its position higher up on the oral plate. Oral shield spearhead-shaped, as long as greatest proximal width, short distal lobe. Madreporite about twice as large as other oral shields, with several hydropores. Adoral shields isosceles triangular, bordering lateral sides of oral shield, not meeting proximally. Ventral arm plates quadrangular with central keel, lateral edges concave. Tentacle pores only partially covered by single wide low tentacle scale, weakly curved, placed at ventral arm plate edge, and across junction between lateral and ventral arm plate on proximal segments.</paragraph>
<caption id="DF4C665262674F32FF11F9235A2350E4" ID-DOI="http://doi.org/10.5281/zenodo.4740565" ID-Zenodo-Dep="4740565" httpUri="https://zenodo.org/record/4740565/files/figure.png" pageId="21" pageNumber="526" startId="21.[151,250,1782,1806]" targetBox="[151,1435,181,1758]" targetPageId="21">
<paragraph id="8B8C36DA62674F32FF11F9235A2350E4" blockId="21.[151,1437,1782,1937]" pageId="21" pageNumber="526">
<emphasis id="B947EAC862674F32FF11F9235E39507A" bold="true" box="[151,277,1782,1807]" pageId="21" pageNumber="526">FIGURE 5.</emphasis>
<taxonomicName id="4C334D5962674F32FE9BF9225D10507B" authority=", Galathea II" authorityName="Galathea II" box="[285,572,1783,1807]" class="Ophiuroidea" family="Amphiuridae" genus="Silax" higherTaxonomySource="CoL" kingdom="Animalia" order="Amphilepidida" pageId="21" pageNumber="526" phylum="Echinodermata" rank="species" species="abdita">
<emphasis id="B947EAC862674F32FE9BF9225E7C507A" box="[285,336,1783,1807]" italics="true" pageId="21" pageNumber="526">Silax</emphasis>
cf.
<emphasis id="B947EAC862674F32FEFCF9225E97507A" box="[378,443,1783,1807]" italics="true" pageId="21" pageNumber="526">abdita</emphasis>
, Galathea II
</taxonomicName>
stn. 716, from lot NHMD-868859. A, dorsal disc section, B, dorsal arm, C, central dorsal disc, D, dorsolateral arm, E, ventral aspect, F, jaws with madreporite, G, proximal ventral arm, H, dorsal disc, I, ventral aspect, J, dorsal arm, K, lateral proximal arm. A–G, SEM images, SMNH-189206, 189209, I–K, digital photos of dried speci- men, NHMD-868700. AdS, adoral shield, CPP, central primary plate, DAP, dorsal arm plate, IPa, infradental papillae, LAP, lateral arm plate, M, madreporite, OPa, oral papillae, OS, oral shield, VAP, ventral arm plate. Scale bars =
<quantity id="4CCB9B3F62674F32FB4BF8AC5A2750E4" box="[1229,1291,1913,1937]" metricMagnitude="-3" metricUnit="m" metricValue="1.0" pageId="21" pageNumber="526" unit="mm" value="1.0">1 mm</quantity>
.
</paragraph>
</caption>
<paragraph id="8B8C36DA62644F31FF11FF425E3457C4" blockId="22.[151,280,151,177]" box="[151,280,151,177]" pageId="22" pageNumber="527">
<heading id="D0C481B662644F31FF11FF425E3457C4" bold="true" box="[151,280,151,177]" fontSize="11" level="1" pageId="22" pageNumber="527" reason="1">
<emphasis id="B947EAC862644F31FF11FF425E3457C4" bold="true" box="[151,280,151,177]" pageId="22" pageNumber="527">Variations</emphasis>
</heading>
</paragraph>
<paragraph id="8B8C36DA62644F31FF11FF355A2E56D8" blockId="22.[151,1437,223,430]" pageId="22" pageNumber="527">In some specimens, the oral shields lack the distal lobe and have an isosceles triangular shape. Tentacle scales may be lacking distalwards from segment four, but it is unknown if this is a natural variation or damage from handling. Some specimens had only seven or six arm spines proximally. These specimens were unusually fragile for larger ophiuroids, but it is unknown if this is typical for the species or caused by rough handling or inadequate initial preservation (most likely in formalin). Many of the larger disc and arm plates cracked during drying or were already cracked. Arms were mostly missing, except segments close to the disc edge and those under the disc.</paragraph>
</subSubSection>
<subSubSection id="C329655162644F31FF11FE2A5DB753B0" pageId="22" pageNumber="527" type="discussion">
<paragraph id="8B8C36DA62644F31FF11FE2A5E25556C" blockId="22.[151,265,511,537]" box="[151,265,511,537]" pageId="22" pageNumber="527">
<emphasis id="B947EAC862644F31FF11FE2A5E25556C" bold="true" box="[151,265,511,537]" pageId="22" pageNumber="527">Remarks</emphasis>
</paragraph>
<paragraph id="8B8C36DA62644F31FF11FD925C2854BC" blockId="22.[151,1437,583,1221]" pageId="22" pageNumber="527">
These specimens exhibit much morphological similarity to
<taxonomicName id="4C334D5962644F31FCABFD925CC85514" baseAuthorityName="A. M. Clark" baseAuthorityYear="1970" box="[813,996,583,609]" class="Ophiuroidea" family="Amphiuridae" genus="Triplodia" kingdom="Animalia" order="Ophiurida" pageId="22" pageNumber="527" phylum="Echinodermata" rank="species" species="abdita">
<emphasis id="B947EAC862644F31FCABFD925CC85514" box="[813,996,583,609]" italics="true" pageId="22" pageNumber="527">Triplodia abdita</emphasis>
</taxonomicName>
, the only specimen of which originated from the Gulf of
<collectingCountry id="F324764A62644F31FEDDFDB95E9B55F3" box="[347,439,620,646]" name="Panama" pageId="22" pageNumber="527">Panama</collectingCountry>
, where also some of our specimens were collected. This genus was established by A.M. Clark (1970) for this specimen, which appears to lack a buccal scale. However, the oral papillae (and tentacle scales) within
<taxonomicName id="4C334D5962644F31FF61FD665E5555B8" box="[231,377,691,717]" class="Ophiuroidea" family="Amphiuridae" genus="Silax" higherTaxonomySource="CoL" kingdom="Animalia" order="Amphilepidida" pageId="22" pageNumber="527" phylum="Echinodermata" rank="species" species="undetermined">
<emphasis id="B947EAC862644F31FF61FD665E3355B8" box="[231,287,691,717]" italics="true" pageId="22" pageNumber="527">Silax</emphasis>
species
</taxonomicName>
can vary greatly in shape, and they are often malformed. The tip of the buccal scale appears between infradental and second adoral shield in our specimens, but due to the small size of these ossicles, they are hard to recognize without SEM. Consequently, here we treat the only species
<taxonomicName id="4C334D5962644F31FB82FD295B475460" baseAuthorityName="A. M. Clark" baseAuthorityYear="1970" box="[1028,1131,763,790]" class="Ophiuroidea" family="Amphiuridae" genus="Triplodia" kingdom="Animalia" order="Ophiurida" pageId="22" pageNumber="527" phylum="Echinodermata" rank="species" species="abdita">
<emphasis id="B947EAC862644F31FB82FD295B385460" box="[1028,1044,764,789]" italics="true" pageId="22" pageNumber="527">T</emphasis>
.
<emphasis id="B947EAC862644F31FBA5FD2E5B475460" box="[1059,1131,763,789]" italics="true" pageId="22" pageNumber="527">abdita</emphasis>
</taxonomicName>
as an extreme morphotype of
<taxonomicName id="4C334D5962644F31FF33FCCA5FC1544C" authorityName="Fell" authorityYear="1962" box="[181,237,799,825]" class="Ophiuroidea" family="Amphiuridae" genus="Silax" higherTaxonomySource="CoL" kingdom="Animalia" order="Amphilepidida" pageId="22" pageNumber="527" phylum="Echinodermata" rank="genus">
<emphasis id="B947EAC862644F31FF33FCCA5FC1544C" box="[181,237,799,825]" italics="true" pageId="22" pageNumber="527">Silax</emphasis>
</taxonomicName>
. Unfortunately, the
<typeStatus id="5488887862644F31FE4DFCCA5D01544C" box="[459,557,799,825]" pageId="22" pageNumber="527" type="holotype">holotype</typeStatus>
of
<taxonomicName id="4C334D5962644F31FDD6FCF55D99544C" baseAuthorityName="A. M. Clark" baseAuthorityYear="1970" box="[592,693,799,826]" class="Ophiuroidea" family="Amphiuridae" genus="Triplodia" kingdom="Animalia" order="Ophiurida" pageId="22" pageNumber="527" phylum="Echinodermata" rank="species" species="abdita">
<emphasis id="B947EAC862644F31FDD6FCF55D4C544C" box="[592,608,800,825]" italics="true" pageId="22" pageNumber="527">T</emphasis>
.
<emphasis id="B947EAC862644F31FDEBFCCA5D99544C" box="[621,693,799,825]" italics="true" pageId="22" pageNumber="527">abdita</emphasis>
</taxonomicName>
appears to be missing from the MCZ (A. Baldinger, personal communication) and morphological details cannot be verified. The type figure shows two supplementary plates on the distal side of the oral shield. However, these may be misrepresented enlarged disc scales that are positioned close to the oral and adoral shields as we find in some of our specimens (
<figureCitation id="13082A5F62644F31FC0AFC5E5B2D54D3" box="[908,1025,907,934]" captionStart="FIGURE 5" captionStartId="21.[151,250,1782,1806]" captionTargetBox="[151,1435,181,1758]" captionTargetId="figure-17@21.[151,1435,181,1758]" captionTargetPageId="21" captionText="FIGURE 5. Silax cf. abdita, Galathea II stn. 716, from lot NHMD-868859. A, dorsal disc section, B, dorsal arm, C, central dorsal disc, D, dorsolateral arm, E, ventral aspect, F, jaws with madreporite, G, proximal ventral arm, H, dorsal disc, I, ventral aspect, J, dorsal arm, K, lateral proximal arm. A–G, SEM images, SMNH-189206, 189209, I–K, digital photos of dried speci- men, NHMD-868700. AdS, adoral shield, CPP, central primary plate, DAP, dorsal arm plate, IPa, infradental papillae, LAP, lateral arm plate, M, madreporite, OPa, oral papillae, OS, oral shield, VAP, ventral arm plate. Scale bars = 1 mm." figureDoi="http://doi.org/10.5281/zenodo.4740565" httpUri="https://zenodo.org/record/4740565/files/figure.png" pageId="22" pageNumber="527">Fig. 5E, F</figureCitation>
). This uncertainty precludes us from fully identifying our material as
<taxonomicName id="4C334D5962644F31FD84FC7A5D5C54BC" baseAuthorityName="A. M Clark" baseAuthorityYear="1970" box="[514,624,943,970]" class="Ophiuroidea" family="Amphiuridae" genus="Silax" higherTaxonomySource="CoL" kingdom="Animalia" order="Amphilepidida" pageId="22" pageNumber="527" phylum="Echinodermata" rank="species" species="abditus">
<emphasis id="B947EAC862644F31FD84FC7A5D3C54BC" box="[514,528,943,969]" italics="true" pageId="22" pageNumber="527">S</emphasis>
.
<emphasis id="B947EAC862644F31FD98FC7A5D5C54BC" box="[542,624,943,969]" italics="true" pageId="22" pageNumber="527">abditus</emphasis>
</taxonomicName>
at this point.
</paragraph>
<paragraph id="8B8C36DA62644F31FF41FC065DB753B0" blockId="22.[151,1437,583,1221]" pageId="22" pageNumber="527">
<taxonomicName id="4C334D5962644F31FF41FC065E565498" baseAuthorityName="A. M Clark" baseAuthorityYear="1970" box="[199,378,979,1005]" class="Ophiuroidea" family="Amphiuridae" genus="Silax" higherTaxonomySource="CoL" kingdom="Animalia" order="Amphilepidida" pageId="22" pageNumber="527" phylum="Echinodermata" rank="species" species="abditus">
<emphasis id="B947EAC862644F31FF41FC065FD35498" box="[199,255,979,1005]" italics="true" pageId="22" pageNumber="527">Silax</emphasis>
cf.
<emphasis id="B947EAC862644F31FEAEFC065E565498" box="[296,378,979,1005]" italics="true" pageId="22" pageNumber="527">abditus</emphasis>
</taxonomicName>
resembles
<taxonomicName id="4C334D5962644F31FE71FC065D4C5498" baseAuthorityName="Lyman" baseAuthorityYear="1879" box="[503,608,979,1006]" class="Ophiuroidea" family="Amphiuridae" genus="Silax" higherTaxonomySource="CoL" kingdom="Animalia" order="Amphilepidida" pageId="22" pageNumber="527" phylum="Echinodermata" rank="species" species="verrilli">
<emphasis id="B947EAC862644F31FE71FC065D295498" box="[503,517,979,1005]" italics="true" pageId="22" pageNumber="527">S</emphasis>
.
<emphasis id="B947EAC862644F31FD94FC065D4C5498" box="[530,608,979,1005]" italics="true" pageId="22" pageNumber="527">verrilli</emphasis>
</taxonomicName>
with regard to the oral skeleton, dorsal disc, and keeled ventral arm plates, but
<taxonomicName id="4C334D5962644F31FF47FC225E065364" baseAuthorityName="Lyman" baseAuthorityYear="1879" box="[193,298,1015,1042]" class="Ophiuroidea" family="Amphiuridae" genus="Silax" higherTaxonomySource="CoL" kingdom="Animalia" order="Amphilepidida" pageId="22" pageNumber="527" phylum="Echinodermata" rank="species" species="verrilli">
<emphasis id="B947EAC862644F31FF47FC225FE35364" box="[193,207,1015,1041]" italics="true" pageId="22" pageNumber="527">S</emphasis>
.
<emphasis id="B947EAC862644F31FF5AFC225E065364" box="[220,298,1015,1041]" italics="true" pageId="22" pageNumber="527">verrilli</emphasis>
</taxonomicName>
has four to five arm spines and no tentacle scales.
<taxonomicName id="4C334D5962644F31FCD0FC225CF15364" baseAuthorityName="Lyman" baseAuthorityYear="1879" box="[854,989,1015,1041]" class="Ophiuroidea" family="Amphiuridae" genus="Silax" higherTaxonomySource="CoL" kingdom="Animalia" order="Amphilepidida" pageId="22" pageNumber="527" phylum="Echinodermata" rank="species" species="daleus">
<emphasis id="B947EAC862644F31FCD0FC225CF15364" box="[854,989,1015,1041]" italics="true" pageId="22" pageNumber="527">Silax daleus</emphasis>
</taxonomicName>
has a similar oral skeleton but three arm spines, flat ventral arm plates and a smaller tentacle scale.
<taxonomicName id="4C334D5962644F31FCAAFBCE5B5C5340" authority="(Lyman, 1879)" baseAuthorityName="Lyman" baseAuthorityYear="1879" box="[812,1136,1051,1077]" class="Ophiuroidea" family="Amphiuridae" genus="Silax" higherTaxonomySource="CoL" kingdom="Animalia" order="Amphilepidida" pageId="22" pageNumber="527" phylum="Echinodermata" rank="species" species="cernuus">
<emphasis id="B947EAC862644F31FCAAFBCE5CE85340" box="[812,964,1051,1077]" italics="true" pageId="22" pageNumber="527">Silax cernuus</emphasis>
(Lyman, 1879)
</taxonomicName>
and
<taxonomicName id="4C334D5962644F31FB20FBCE5FF5532C" authority="(Lyman, 1879)" baseAuthorityName="Lyman" baseAuthorityYear="1879" class="Ophiuroidea" family="Amphiuridae" genus="Silax" higherTaxonomySource="CoL" kingdom="Animalia" order="Amphilepidida" pageId="22" pageNumber="527" phylum="Echinodermata" rank="species" species="patulus">
<emphasis id="B947EAC862644F31FB20FBCE5A1B5340" box="[1190,1335,1051,1077]" italics="true" pageId="22" pageNumber="527">Silax patulus</emphasis>
(Lyman, 1879)
</taxonomicName>
also have only three arm spines, whereas
<taxonomicName id="4C334D5962644F31FD20FBEA5CDE532C" authority="(Koehler, 1908)" baseAuthorityName="Koehler" baseAuthorityYear="1908" box="[678,1010,1087,1114]" class="Ophiuroidea" family="Amphiuridae" genus="Silax" higherTaxonomySource="CoL" kingdom="Animalia" order="Amphilepidida" pageId="22" pageNumber="527" phylum="Echinodermata" rank="species" species="magnificus">
<emphasis id="B947EAC862644F31FD20FBEA5D98532C" box="[678,692,1087,1113]" italics="true" pageId="22" pageNumber="527">S</emphasis>
.
<emphasis id="B947EAC862644F31FD47FBEA5C10532C" box="[705,828,1087,1113]" italics="true" pageId="22" pageNumber="527">magnificus</emphasis>
(
<bibRefCitation id="EFA24B2B62644F31FCCFFBEA5CC6532C" author="Koehler" box="[841,1002,1087,1113]" firstAuthor="Koehler" pageId="22" pageNumber="527" pagination="529 - 649" refId="ref15788" refString="Koehler, R. (1908) Asteries, Ophiures et Echinides de l'Expedition Antarctique Nationale Ecossaise. Transactions of the Royal Society of Edinburgh, 46, 529 - 649. https: // doi. org / 10.1017 / S 008045680000380 X" type="journal article" year="1908">Koehler, 1908</bibRefCitation>
)
</taxonomicName>
possesses four spines. The differences are small and arm spine numbers may vary somewhat within species. The presence or absence of tentacle scales among individuals of the same species seems more inconsistent than in other ophiuroid genera, but they may be removed by rough handling during collection.
</paragraph>
</subSubSection>
</treatment>
</document>
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