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<document id="97BBEA28FE08C36B88D2E52A5943ACBD" ID="10.11646/zootaxa.4208.5.1" ID-CLB-Dataset="37394" ID-DOI="10.11646/zootaxa.4208.5.1" ID-GBIF-Dataset="febe8ac8-fdcc-49bb-b97d-e69f87dfb076" ID-ISSN="1175-5326" ID-Zenodo-Dep="211686" ID-ZooBank="74C3929D-570C-4555-9B7C-15A17CF511DF" IM.materialsCitations_approvedBy="felipe" IM.metadata_approvedBy="felipe" IM.tables_requiresApprovalFor="existingObjects,plazi" IM.taxonomicNames_approvedBy="felipe" checkinTime="1482218359713" checkinUser="plazi" docAuthor="Weigmann, Simon, Ebert, David A., Clerkin, Paul J., Stehmann, Matthias F. W. &amp; Naylor, Gavin J. P." docDate="2016" docId="039987977D0BFFA1FF2AF97BFA77FB9F" docLanguage="en" docName="zootaxa.4208.5.1.pdf" docOrigin="Zootaxa 4208 (5)" docStyle="DocumentStyle:647186512141C8FC8976D5BCC54AEB7D.9:Zootaxa.2013-.journal_article" docStyleId="647186512141C8FC8976D5BCC54AEB7D" docStyleName="Zootaxa.2013-.journal_article" docStyleVersion="9" docTitle="Bythaelurus" docType="treatment" docVersion="7" lastPageNumber="427" masterDocId="FFA0FFEF7D11FFBAFFBDFFDFFFEBFFC8" masterDocTitle="Bythaelurus bachi n. sp., a new deep-water catshark (Carcharhiniformes, Scyliorhinidae) from the southwestern Indian Ocean, with a review of Bythaelurus species and a key to their identification" masterLastPageNumber="432" masterPageNumber="401" pageNumber="427" updateTime="1698434971614" updateUser="ExternalLinkService">
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<mods:title id="269ABAE6EEB2BDC1558A2CF98A898976">Bythaelurus bachi n. sp., a new deep-water catshark (Carcharhiniformes, Scyliorhinidae) from the southwestern Indian Ocean, with a review of Bythaelurus species and a key to their identification</mods:title>
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<mods:namePart id="364EA45C63CEA73FC32615D90740C8F8">Weigmann, Simon</mods:namePart>
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<mods:namePart id="0B84E045270135D357548BEEB416812D">Ebert, David A.</mods:namePart>
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<mods:namePart id="3746BFBF324C489DF7D2C97A94E728D7">Stehmann, Matthias F. W.</mods:namePart>
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<mods:namePart id="7FE935F5A062657B6C3FADDE000FE5B3">Naylor, Gavin J. P.</mods:namePart>
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<mods:date id="18C4EE15BB3C8D61BD3C06CC70FE198F">2016</mods:date>
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<treatment id="039987977D0BFFA1FF2AF97BFA77FB9F" ID-DOI="http://doi.org/10.5281/zenodo.6068490" ID-GBIF-Taxon="125160264" ID-Zenodo-Dep="6068490" LSID="urn:lsid:plazi:treatment:039987977D0BFFA1FF2AF97BFA77FB9F" httpUri="http://treatment.plazi.org/id/039987977D0BFFA1FF2AF97BFA77FB9F" lastPageId="27" lastPageNumber="427" pageId="26" pageNumber="427">
<subSubSection id="C32A650A7D0BFFA0FF2AF97BFD94F976" box="[151,639,1699,1726]" pageId="26" pageNumber="427" type="nomenclature">
<paragraph id="8B8F36817D0BFFA0FF2AF97BFD94F976" blockId="26.[151,639,1699,1726]" box="[151,639,1699,1726]" pageId="26" pageNumber="427">
<heading id="D0C781ED7D0BFFA0FF2AF97BFD94F976" bold="true" box="[151,639,1699,1726]" fontSize="11" level="1" pageId="26" pageNumber="427" reason="1">
<emphasis id="B944EA937D0BFFA0FF2AF97BFD94F976" bold="true" box="[151,639,1699,1726]" pageId="26" pageNumber="427">
Key to the valid species of
<taxonomicName id="4C304D027D0BFFA0FE5CF97CFD9EF975" ID-CoL="62JNJ" ID-ENA="876122" box="[481,629,1699,1725]" class="Elasmobranchii" family="Scyliorhinidae" genus="Bythaelurus" kingdom="Animalia" order="Carcharhiniformes" pageId="26" pageNumber="427" phylum="Chordata" rank="genus">
<emphasis id="B944EA937D0BFFA0FE5CF97CFD9EF975" bold="true" box="[481,629,1699,1725]" italics="true" pageId="26" pageNumber="427">Bythaelurus</emphasis>
</taxonomicName>
:
</emphasis>
</heading>
</paragraph>
</subSubSection>
<keyStep id="30C42E247D0BFFA0FF2AF935FA77F8D4" pageId="26" pageNumber="427">
<subSubSection id="C32A650A7D0BFFA0FF2AF935FA77F937" box="[151,1436,1770,1791]" pageId="26" pageNumber="427" type="key">
<paragraph id="8B8F36817D0BFFA0FF2AF935FA77F937" blockId="26.[151,1436,1770,2026]" box="[151,1436,1770,1791]" pageId="26" pageNumber="427">
<keyLead id="30C195B47D0BFFA0FF2AF935FA77F937" box="[151,1436,1770,1791]" pageId="26" pageNumber="427">1a. Coloration variegated, with irregularly distributed spots and blotches; markings not symmetrical..................... 2.</keyLead>
</paragraph>
</subSubSection>
<paragraph id="8B8F36817D0BFFA0FF2AF8D8FA77F8D4" blockId="26.[151,1436,1770,2026]" box="[151,1436,1799,1820]" pageId="26" pageNumber="427">
<keyLead id="30C195B47D0BFFA0FF2AF8D8FA77F8D4" box="[151,1436,1799,1820]" pageId="26" pageNumber="427">1b. Coloration pale, dusky, or with line of pale spots; usually without conspicuous blotches............................ 3.</keyLead>
</paragraph>
</keyStep>
<keyStep id="30C42E247D0BFFA0FF2AF8FAFA77F804" pageId="26" pageNumber="427">
<paragraph id="8B8F36817D0BFFA0FF2AF8FAFA70F8BC" blockId="26.[151,1436,1770,2026]" pageId="26" pageNumber="427">
<materialsCitation id="3B583CDC7D0BFFA0FF2AF8FAFA70F8BC" ID-GBIF-Occurrence="1417439873" country="Madagascar" location="southwestern Indian Ocean" pageId="26" pageNumber="427" specimenCount="1">
<keyLead id="30C195B47D0BFFA0FF2AF8FAFA70F8BC" pageId="26" pageNumber="427">
2a. Grayish with a pattern of dark brown saddle-like markings on back and tail, and with variegated dark brown blotches on flanks; inside of mouth grayish with brown speckles; ventral surface whitish....................................................................................................
<taxonomicName id="4C304D027D0BFFA0FC14F880FBEBF8BC" box="[937,1024,1887,1908]" class="Elasmobranchii" family="Scyliorhinidae" genus="Bythaelurus" kingdom="Animalia" order="Carcharhiniformes" pageId="26" pageNumber="427" phylum="Chordata" rank="species" species="clevai">
<emphasis id="B944EA937D0BFFA0FC14F880FBEBF8BC" box="[937,1024,1887,1908]" italics="true" pageId="26" pageNumber="427">B. clevai</emphasis>
</taxonomicName>
[
<location id="8EEF605A7D0BFFA0FBB1F880FAFCF8BC" LSID="urn:lsid:plazi:treatment:039987977D0BFFA1FF2AF97BFA77FB9F:8EEF605A7D0BFFA0FBB1F880FAFCF8BC" box="[1036,1303,1887,1908]" country="Madagascar" name="southwestern Indian Ocean" pageId="26" pageNumber="427">southwestern Indian Ocean</location>
:
<collectingCountry id="F32776117D0BFFA0FA9DF880FA7CF8BC" box="[1312,1431,1887,1908]" name="Madagascar" pageId="26" pageNumber="427">Madagascar</collectingCountry>
]
</keyLead>
</materialsCitation>
</paragraph>
<paragraph id="8B8F36817D0BFFA0FF2AF8A2FA77F804" blockId="26.[151,1436,1770,2026]" pageId="26" pageNumber="427">
<keyLead id="30C195B47D0BFFA0FF2AF8A2FA77F804" pageId="26" pageNumber="427">
2b. Chocolate brown dorsally with pale spots, the largest being about equal in size to eye diameter above midline, smaller below; posterior margin of dorsal, pectoral, and pelvic fins pale; ventral surface pale...........................................................................................
<taxonomicName id="4C304D027D0BFFA0FCEFF868FC2EF804" box="[850,965,1975,1996]" class="Elasmobranchii" family="Scyliorhinidae" genus="Bythaelurus" kingdom="Animalia" order="Carcharhiniformes" pageId="26" pageNumber="427" phylum="Chordata" rank="species" species="giddingsi">
<emphasis id="B944EA937D0BFFA0FCEFF868FC2EF804" box="[850,965,1975,1996]" italics="true" pageId="26" pageNumber="427">B. giddingsi</emphasis>
</taxonomicName>
[southeastern Pacific Ocean: Galapagos Islands]
</keyLead>
</paragraph>
</keyStep>
<paragraph id="8B8F36817D0BFFA1FF2AF80AFA77FB9F" blockId="26.[151,1436,1770,2026]" lastBlockId="27.[151,1436,151,1111]" lastPageId="27" lastPageNumber="428" pageId="26" pageNumber="427">
<keyLead id="30C195B47D0BFFA1FF2AF80AFEFEFF64" lastPageId="27" lastPageNumber="428" pageId="26" pageNumber="427">
<keyStep id="30C42E247D0BFFA1FF2AF80AFEFEFF64" lastPageId="27" lastPageNumber="428" pageId="26" pageNumber="427">3a. Coloration blackish with hoary gray surface and some fins white-tipped posteriorly; teeth with cusps and lateral cusps of subequal</keyStep>
</keyLead>
<subSection id="E2BF2F6A7D0AFFA1FEA6FF48FA77FB9F" pageId="27" pageNumber="428" type="multiple">
length; validity and generic assignment uncertain.............
<taxonomicName id="4C304D027D0AFFA1FC24FF48FBEBFF64" box="[921,1024,151,172]" class="Elasmobranchii" family="Scyliorhinidae" genus="Bythaelurus" kingdom="Animalia" order="Carcharhiniformes" pageId="27" pageNumber="428" phylum="Chordata" rank="species" species="alcockii">
<emphasis id="B944EA937D0AFFA1FC24FF48FBEBFF64" box="[921,1024,151,172]" italics="true" pageId="27" pageNumber="428">B. alcockii</emphasis>
</taxonomicName>
[northwestern Indian Ocean: Arabian Sea] 3b. Coloration lighter; at least anterolateral teeth in upper jaw with median cusp much longer than lateral cusps............ 4. 4a. Anal-fin base more than 1.5 times second dorsal-fin base length; color light to medium brown above with dusky areas near the fins or indistinct dark blotches, whitish to light brown below; maturity size
<quantity id="4CC89B647D0AFFA1FC09FF30FBF8FECC" box="[948,1043,239,260]" metricMagnitude="-1" metricUnit="m" metricValue="2.65" metricValueMax="3.1" metricValueMin="2.2" pageId="27" pageNumber="428" unit="cm" value="26.5" valueMax="31.0" valueMin="22.0">2231 cm</quantity>
TL; maximum size
<quantity id="4CC89B647D0AFFA1FB6BFF30FADEFECC" box="[1238,1333,239,260]" metricMagnitude="-1" metricUnit="m" metricValue="3.45" metricValueMax="3.9" metricValueMin="3.0" pageId="27" pageNumber="428" unit="cm" value="34.5" valueMax="39.0" valueMin="30.0">3039 cm</quantity>
TL.. 5. 4b. Anal-fin base equal to or less than 1.5 times second dorsal-fin base length; coloration variable but without dusky areas near fins or indistinct dark blotches; maturity size
<quantity id="4CC89B647D0AFFA1FD2EFEF5FD19FEF7" box="[659,754,298,319]" metricMagnitude="-1" metricUnit="m" metricValue="4.55" metricValueMax="5.9" metricValueMin="3.2" pageId="27" pageNumber="428" unit="cm" value="45.5" valueMax="59.0" valueMin="32.0">3259 cm</quantity>
TL; maximum size
<quantity id="4CC89B647D0AFFA1FC08FEF5FBFFFEF7" box="[949,1044,298,319]" metricMagnitude="-1" metricUnit="m" metricValue="5.9" metricValueMax="7.6" metricValueMin="4.2" pageId="27" pageNumber="428" unit="cm" value="59.0" valueMax="76.0" valueMin="42.0">4276 cm</quantity>
TL........................... 7. 5a. Tongue and roof of mouth without (or with rudimentary) papillae; coloration largely plain with dusky areas near fins....................................................................
<taxonomicName id="4C304D027D0AFFA1FC79FEBAFBC1FEB2" box="[964,1066,357,378]" class="Elasmobranchii" family="Scyliorhinidae" genus="Bythaelurus" kingdom="Animalia" order="Carcharhiniformes" pageId="27" pageNumber="428" phylum="Chordata" rank="species" species="lutarius">
<emphasis id="B944EA937D0AFFA1FC79FEBAFBC1FEB2" box="[964,1066,357,378]" italics="true" pageId="27" pageNumber="428">B. lutarius</emphasis>
</taxonomicName>
[western Indian Ocean:
<collectingCountry id="F32776117D0AFFA1FAA8FEBAFA7CFEB2" box="[1301,1431,357,378]" name="Mozambique" pageId="27" pageNumber="428">Mozambique</collectingCountry>
] 5b. Tongue and roof of mouth with numerous papillae; trunk and tail with 56 indistinct, dark blotches................... 6. 6a. Head with distinct lateral indention anterior to outer nostrils; adult claspers rather slender (base width ~1.5% TL) and with knob-like apex..........
<taxonomicName id="4C304D027D0AFFA1FE5EFE62FDB8FE1A" box="[483,595,445,466]" class="Elasmobranchii" family="Scyliorhinidae" genus="Bythaelurus" kingdom="Animalia" order="Carcharhiniformes" pageId="27" pageNumber="428" phylum="Chordata" rank="species" species="hispidus">
<emphasis id="B944EA937D0AFFA1FE5EFE62FDB8FE1A" box="[483,595,445,466]" italics="true" pageId="27" pageNumber="428">B. hispidus</emphasis>
</taxonomicName>
[western and eastern Indian Ocean:
<collectingCountry id="F32776117D0AFFA1FC0CFE62FC04FE1A" box="[945,1007,445,466]" name="Kenya" pageId="27" pageNumber="428">Kenya</collectingCountry>
to
<collectingCountry id="F32776117D0AFFA1FBB2FE62FBA7FE1A" box="[1039,1100,445,466]" name="Oman" pageId="27" pageNumber="428">Oman</collectingCountry>
, southern
<collectingCountry id="F32776117D0AFFA1FB10FE62FB35FE1A" box="[1197,1246,445,466]" name="India" pageId="27" pageNumber="428">India</collectingCountry>
and Andaman Sea] 6b. Head narrow and without distinct lateral indention anterior to outer nostrils; adult claspers broader (base width ~2% TL) and without knob-like apex...........................
<taxonomicName id="4C304D027D0AFFA1FCBFFE28FC4FFDC4" box="[770,932,503,524]" class="Elasmobranchii" family="Scyliorhinidae" genus="Bythaelurus" kingdom="Animalia" order="Carcharhiniformes" pageId="27" pageNumber="428" phylum="Chordata" rank="species" species="tenuicephalus">
<emphasis id="B944EA937D0AFFA1FCBFFE28FC4FFDC4" box="[770,932,503,524]" italics="true" pageId="27" pageNumber="428">B. tenuicephalus</emphasis>
</taxonomicName>
[western Indian Ocean:
<collectingCountry id="F32776117D0AFFA1FB2DFE28FB0DFDC4" box="[1168,1254,503,524]" name="Tanzania" pageId="27" pageNumber="428">Tanzania</collectingCountry>
and
<collectingCountry id="F32776117D0AFFA1FAA8FE28FA7CFDC4" box="[1301,1431,503,524]" name="Mozambique" pageId="27" pageNumber="428">Mozambique</collectingCountry>
] 7a. Labial furrows reduced, with uppers and lowers about equal in length........................................... 8. 7b. Labial furrows distinct, with lowers noticeably longer than uppers.............................................. 9. 8a. Pre-vent length 1.3 times in tail length; preorbital snout length subequal to eye length; length of lateral trunk denticles less than twice their width..................................
<taxonomicName id="4C304D027D0AFFA1FC9BFDB2FC57FD4A" box="[806,956,621,642]" class="Elasmobranchii" family="Scyliorhinidae" genus="Bythaelurus" kingdom="Animalia" order="Carcharhiniformes" pageId="27" pageNumber="428" phylum="Chordata" rank="species" species="immaculatus">
<emphasis id="B944EA937D0AFFA1FC9BFDB2FC57FD4A" box="[806,956,621,642]" italics="true" pageId="27" pageNumber="428">B. immaculatus</emphasis>
</taxonomicName>
[western central Pacific Ocean:
<collectingRegion id="49F4F8637D0AFFA1FB49FDB2FAC7FD4A" box="[1268,1324,621,642]" country="Tanzania" name="Kusini Unguja" pageId="27" pageNumber="428">South</collectingRegion>
<collectingCountry id="F32776117D0AFFA1FA8FFDB2FA80FD4A" box="[1330,1387,621,642]" name="China" pageId="27" pageNumber="428">China</collectingCountry>
Sea] 8b. Pre-vent length exceeds tail length; preorbital snout length 1.3 times eye length; length of lateral trunk denticles more than twice their width....................................
<taxonomicName id="4C304D027D0AFFA1FC87FD78FC74FD74" box="[826,927,679,700]" class="Elasmobranchii" family="Scyliorhinidae" genus="Bythaelurus" kingdom="Animalia" order="Carcharhiniformes" pageId="27" pageNumber="428" phylum="Chordata" rank="species" species="incanus">
<emphasis id="B944EA937D0AFFA1FC87FD78FC74FD74" box="[826,927,679,700]" italics="true" pageId="27" pageNumber="428">B. incanus</emphasis>
</taxonomicName>
[southeastern Indian Ocean: northwestern
<collectingCountry id="F32776117D0AFFA1FA81FD78FA7CFD74" box="[1340,1431,679,700]" name="Australia" pageId="27" pageNumber="428">Australia</collectingCountry>
] 9a. Light brown to gray on dorsal and lateral surfaces with a line of white spots on sides of small individuals, whitish ventrally, fin tips with broad white areas, caudal fin also with dark bands............
<taxonomicName id="4C304D027D0AFFA1FC0AFD3DFBC9FD3F" box="[951,1058,738,759]" class="Elasmobranchii" family="Scyliorhinidae" genus="Bythaelurus" kingdom="Animalia" order="Carcharhiniformes" pageId="27" pageNumber="428" phylum="Chordata" rank="species" species="dawsoni">
<emphasis id="B944EA937D0AFFA1FC0AFD3DFBC9FD3F" box="[951,1058,738,759]" italics="true" pageId="27" pageNumber="428">B. dawsoni</emphasis>
</taxonomicName>
[western Pacific Ocean:
<collectingCountry id="F32776117D0AFFA1FAAEFD3DFA7DFD3F" box="[1299,1430,738,759]" name="New Zealand" pageId="27" pageNumber="428">New Zealand</collectingCountry>
] 9b. Flanks of body lack a line of white spots, ventrally darker, fin tips without broad white areas, caudal fin without dark bands.................................................................................................... 10. 10a. Color plain dark brown or blackish above and below; maturity size
<quantity id="4CC89B647D0AFFA1FCD5FCE5FC2CFC87" box="[872,967,826,847]" metricMagnitude="-1" metricUnit="m" metricValue="5.55" metricValueMax="5.9" metricValueMin="5.2" pageId="27" pageNumber="428" unit="cm" value="55.5" valueMax="59.0" valueMin="52.0">5259 cm</quantity>
TL, maximum size
<quantity id="4CC89B647D0AFFA1FB34FCE5FB2FFC87" box="[1161,1220,826,847]" metricMagnitude="-1" metricUnit="m" metricValue="7.3" pageId="27" pageNumber="428" unit="cm" value="73.0">73 cm</quantity>
TL..................................................
<taxonomicName id="4C304D027D0AFFA1FD32FC88FCE0FCA4" box="[655,779,855,876]" class="Elasmobranchii" family="Scyliorhinidae" genus="Bythaelurus" kingdom="Animalia" order="Carcharhiniformes" pageId="27" pageNumber="428" phylum="Chordata" rank="species" species="canescens">
<emphasis id="B944EA937D0AFFA1FD32FC88FCE0FCA4" box="[655,779,855,876]" italics="true" pageId="27" pageNumber="428">B. canescens</emphasis>
</taxonomicName>
[southeastern Pacific Ocean:
<collectingCountry id="F32776117D0AFFA1FB94FC88FBBEFCA4" box="[1065,1109,855,876]" name="Peru" pageId="27" pageNumber="428">Peru</collectingCountry>
and
<collectingCountry id="F32776117D0AFFA1FB39FC88FB51FCA4" box="[1156,1210,855,876]" name="Chile" pageId="27" pageNumber="428">Chile</collectingCountry>
, to Straits of Magellan] 10b. Coloration lighter; maturity size
<quantity id="4CC89B647D0AFFA1FDA4FCAAFD9CFC42" box="[537,631,885,906]" metricMagnitude="-1" metricUnit="m" metricValue="4.2" metricValueMax="4.8" metricValueMin="3.6" pageId="27" pageNumber="428" unit="cm" value="42.0" valueMax="48.0" valueMin="36.0">3648 cm</quantity>
TL, maximum size
<quantity id="4CC89B647D0AFFA1FC8AFCAAFC7EFC42" box="[823,917,885,906]" metricMagnitude="-1" metricUnit="m" metricValue="5.0" metricValueMax="5.5" metricValueMin="4.5" pageId="27" pageNumber="428" unit="cm" value="50.0" valueMax="55.0" valueMin="45.0">4555 cm</quantity>
TL; known only from the southwestern Indian Ocean.................................................................................................. 11. 11a. Coloration medium to dark brown with light fin edges and a distinct dark dusky-colored snout; dorsal caudal-fin margin with prominent crest of comb-like dermal denticles; tongue and roof of mouth without papillae..............................................................................
<taxonomicName id="4C304D027D0AFFA1FC90FC35FC67FC37" box="[813,908,1002,1023]" class="Elasmobranchii" family="Scyliorhinidae" genus="Bythaelurus" kingdom="Animalia" order="Carcharhiniformes" pageId="27" pageNumber="428" phylum="Chordata" rank="species" species="naylori">
<emphasis id="B944EA937D0AFFA1FC90FC35FC67FC37" box="[813,908,1002,1023]" italics="true" pageId="27" pageNumber="428">B. naylori</emphasis>
</taxonomicName>
[southwestern Indian Ocean: Southwest Indian Ridge] 11b. Coloration plain beige to light grayish-brown; dorsal caudal-fin margin lacks prominent crest of comb-like dermal denticles; tongue and roof of mouth with numerous, partially composite papillae.............................................................................................
<taxonomicName id="4C304D027D0AFFA1FC88FB9DFC6EFB9F" box="[821,901,1090,1111]" class="Elasmobranchii" family="Scyliorhinidae" genus="Bythaelurus" kingdom="Animalia" order="Carcharhiniformes" pageId="27" pageNumber="428" phylum="Chordata" rank="species" species="bachi" status="sp. nov.">
<emphasis id="B944EA937D0AFFA1FC88FB9DFC6EFB9F" box="[821,901,1090,1111]" italics="true" pageId="27" pageNumber="428">B. bachi</emphasis>
</taxonomicName>
<emphasis id="B944EA937D0AFFA1FC36FB9DFC29FB9F" bold="true" box="[907,962,1090,1111]" pageId="27" pageNumber="428">
<taxonomicNameLabel id="A27757E87D0AFFA1FC36FB9DFC29FB9F" box="[907,962,1090,1111]" pageId="27" pageNumber="428" rank="species">n. sp.</taxonomicNameLabel>
</emphasis>
[southwestern Indian Ocean:
<collectingCountry id="F32776117D0AFFA1FB5CFB9DFABEFB9F" box="[1249,1365,1090,1111]" name="Madagascar" pageId="27" pageNumber="428">Madagascar</collectingCountry>
Ridge]
</subSection>
</paragraph>
</treatment>
</document>