254 lines
26 KiB
XML
254 lines
26 KiB
XML
<document ID-DOI="http://dx.doi.org/10.3897/zookeys.738.23708" ID-GBIF-Dataset="4aecc3c2-a4cd-4ab5-ba88-b3fa95d4497d" ID-PMC="PMC5904392" ID-Pensoft-Pub="1313-2970-738-27" ID-PubMed="29670418" ID-ZBK="1B5E85D2304043DAAA4E3D0E749C09A1" ModsDocAuthor="" ModsDocDate="2018" ModsDocID="1313-2970-738-27" ModsDocOrigin="ZooKeys 738" ModsDocTitle="A new species of trogloplacine crab of the genus Australocarcinus Davie, 1988 from a freshwater stream in Mahé, Seychelles (Crustacea, Brachyura, Chasmocarcinidae)" checkinTime="1519083459931" checkinUser="pensoft" docAuthor="Ng, Peter K. L. & Daniels, Savel R." docDate="2018" docId="B4D9E7C6AEB2125384B80056ACCC69B2" docLanguage="en" docName="ZooKeys 738: 27-35" docOrigin="ZooKeys 738" docSource="http://dx.doi.org/10.3897/zookeys.738.23708" docTitle="Australocarcinus insperatus Ng & Daniels, 2018, sp. n." docType="treatment" docUuid="909E98B1-A957-44F0-BD2E-2C665E67CFB1" docUuidSource="ZooBank" docVersion="5" lastPageNumber="31" masterDocId="B005FFD4FF854164FFA70E628015634B" masterDocTitle="A new species of trogloplacine crab of the genus Australocarcinus Davie, 1988 from a freshwater stream in Mahe, Seychelles (Crustacea, Brachyura, Chasmocarcinidae)" masterLastPageNumber="35" masterPageNumber="27" pageNumber="27" updateTime="1668165452643" updateUser="ExternalLinkService">
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<mods:titleInfo>
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<mods:title>A new species of trogloplacine crab of the genus Australocarcinus Davie, 1988 from a freshwater stream in Mahe, Seychelles (Crustacea, Brachyura, Chasmocarcinidae)</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>Ng, Peter K. L.</mods:namePart>
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</mods:name>
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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:namePart>Daniels, Savel R.</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: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>738</mods:number>
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</mods:detail>
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<mods:extent unit="page">
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<mods:start>27</mods:start>
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<mods:end>35</mods:end>
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<mods:location>
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<mods:url>http://dx.doi.org/10.3897/zookeys.738.23708</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.738.23708</mods:identifier>
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<mods:identifier type="Pensoft-Pub">1313-2970-738-27</mods:identifier>
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<mods:identifier type="ZBK">1B5E85D2304043DAAA4E3D0E749C09A1</mods:identifier>
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<mods:identifier type="ZooBank">1B5E85D2304043DAAA4E3D0E749C09A1</mods:identifier>
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</mods:mods>
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<treatment ID-GBIF-Taxon="141117732" LSID="urn:lsid:zoobank.org:act:909E98B1-A957-44F0-BD2E-2C665E67CFB1" httpUri="http://treatment.plazi.org/id/B4D9E7C6AEB2125384B80056ACCC69B2" lastPageId="4" lastPageNumber="31" pageId="0" pageNumber="27">
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<subSubSection pageId="0" pageNumber="27" type="nomenclature">
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<paragraph pageId="0" pageNumber="27">
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<taxonomicName LSID="http://zoobank.org/909E98B1-A957-44F0-BD2E-2C665E67CFB1" class="Malacostraca" family="Chasmocarcinidae" genus="Australocarcinus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Australocarcinus insperatus" order="Decapoda" pageId="0" pageNumber="27" phylum="Arthropoda" rank="species" species="insperatus">Australocarcinus insperatus</taxonomicName>
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<taxonomicNameLabel pageId="0" pageNumber="27">sp. n.</taxonomicNameLabel>
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Figs 1, 2, 3
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</paragraph>
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</subSubSection>
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<subSubSection pageId="0" pageNumber="27" type="materials_examined">
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<paragraph pageId="0" pageNumber="27">Material examined.</paragraph>
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<paragraph pageId="0" pageNumber="27">
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Holotype: male (10.7
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<normalizedToken originalValue="×">x</normalizedToken>
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8.6 mm) (ZRC 2017.1072), in shallow stream, ca. 800 m from sea, about 2 km south-southeast of international airport,
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<geoCoordinate direction="south" orientation="latitude" precision="1" value="-4.692339">4°41'32.42"S</geoCoordinate>
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,
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<geoCoordinate direction="east" orientation="longitude" precision="1" value="55.51747">55°31'2.90"E</geoCoordinate>
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,
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<normalizedToken originalValue="Mahé">Mahe</normalizedToken>
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, Seychelles, coll. SR Daniels, May 2010. Paratypes: 1 male (8.5
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<normalizedToken originalValue="×">x</normalizedToken>
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7.2 mm), 1 female (9.5
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<normalizedToken originalValue="×">x</normalizedToken>
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7.8 mm) (ZRC 2017.1073), same data as holotype.
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</paragraph>
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</subSubSection>
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<subSubSection pageId="1" pageNumber="28" type="diagnosis">
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<paragraph pageId="1" pageNumber="28">
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<pageBreakToken pageId="1" pageNumber="28" start="start">Diagnosis</pageBreakToken>
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.
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</paragraph>
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<paragraph pageId="1" pageNumber="28">
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Carapace subquadrate, front weakly bilobed, with shallow median concavity (Fig. 1A, B); dorsal surface gently convex (Fig. 1F); dorsal surfaces and margins covered with short uneven tomentum (Fig. 1A, B); anterolateral margins arcuate, with four low teeth: first widest with gently sinuous margin, second lobiform, third wide, fourth (at junction of antero- and posterolateral margins) dentate, directed laterally, protruding beyond margin (Fig. 1B). Posterolateral margin converging towards gently convex posterior carapace margin (Fig. 1B). Epistome compressed, posterior margin with distinct triangular median lobe with median fissure, lateral margins gently sinuous (Fig. 1G). Eye peduncle completely filling orbit, relatively short, mobile; cornea distinct, pigmented (Fig. 1B, F). Third maxillipeds leaving gap when closed; merus quadrate, anteroexternal angle auriculiform; ischium quadrate, slightly longer than merus with very shallow median sulcus (Fig. 1C, D). Chelipeds subequal, relatively stouter in males (Figs 1A, 2E); cutting margins of both chelae with distinct teeth in both sexes, base of fingers with tuft of stiff setae; proximal part of dactylus of right chela with large, triangular tooth directed towards palm (Fig. 2A); ventral surface of cheliped merus with tubercles. Ambulatory legs moderately short; meri unarmed but setose to varying degrees; P2 carpus, propodus and dactylus with very long coarse setae which obscures margins (Figs 1A, 2B); P3-P5 propodus and dactylus setose but setae shorter than on P5 (Fig. 2C); P5 dactylus straight (Fig. 2C). Thoracic sternites 1, 2 fused, broadly triangular, short; separated from sternite 3 by sinuous groove; sternites 3, 4 fused, relatively broad (Fig. 1D). Male pleon with lateral margins of somite 6 and fused somites 3‒5 gently sinuous; telson slightly longer than broad (Fig. 1D, E). Sterno-pleonal cavity of male deep, press-button for pleonal holding small, short tubercle posterior to thoracic sternal suture 4/5 near edge of sterno-pleonal cavity. Male thoracic sternite 8 short, rectangular; supplementary plate narrow, wider along outer part (Figs 1E, 2D). G1 stout; basal part truncate; distal part cylindrical, with rounded tip, covered with short spinules (Fig. 3
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<normalizedToken originalValue="A–D">A-D</normalizedToken>
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). G2 prominently longer than G1, basal segment curved; distal segment slightly longer than basal segment, apex cup-like (Fig. 3E, F). Somites of female pleon with slightly convex lateral margins; telson wider than long (Fig. 2F). Sterno-pleonal cavity of female moderately deep, with large vulvae distinctly separated from each other, covering most of thoracic sternite 5, ovate, with low raised lip on outer margin, opening slit-like (Fig. 2G).
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</paragraph>
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<caption pageId="1" pageNumber="28">
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<paragraph pageId="1" pageNumber="28">
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Figure 1.
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<taxonomicName class="Malacostraca" family="Chasmocarcinidae" genus="Australocarcinus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Australocarcinus insperatus" order="Decapoda" pageId="1" pageNumber="28" phylum="Arthropoda" rank="species" species="insperatus">Australocarcinus insperatus</taxonomicName>
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sp. n., holotype male (10.7
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<normalizedToken originalValue="×">x</normalizedToken>
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8.6 mm) (ZRC 2017.1072), Seychelles. A overall dorsal habitus B dorsal view of carapace (right side denuded) C right third maxilliped (denuded) D anterior thoracic sternum and pleon E posterior thoracic sternum and pleon F frontal view of cephalothorax G posterior margin of epistome.
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</paragraph>
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</caption>
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<caption pageId="1" pageNumber="28">
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<paragraph pageId="1" pageNumber="28">
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Figure 2.
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<taxonomicName class="Malacostraca" family="Chasmocarcinidae" genus="Australocarcinus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Australocarcinus insperatus" order="Decapoda" pageId="1" pageNumber="28" phylum="Arthropoda" rank="species" species="insperatus">Australocarcinus insperatus</taxonomicName>
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sp. n.
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<normalizedToken originalValue="A–D">A-D</normalizedToken>
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holotype male (10.7
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<normalizedToken originalValue="×">x</normalizedToken>
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8.6 mm) (ZRC 2017.1072), Seychelles
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<normalizedToken originalValue="E–G">E-G</normalizedToken>
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paratype female (9.5
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<normalizedToken originalValue="×">x</normalizedToken>
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7.8 mm) (ZRC 2017.1073), Seychelles. A outer surfaces of chelae B right first ambulatory leg showing setose posterior margin on propodus and dactylus C left fourth ambulatory leg D posterior thoracic sternum showing supplementary plate E female overall dorsal habitus F female posterior thoracic sternum and pleon G female sterno-pleonal cavity showing vulvae.
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</paragraph>
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</caption>
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</subSubSection>
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<subSubSection pageId="1" pageNumber="28" type="etymology">
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<paragraph pageId="1" pageNumber="28">Etymology.</paragraph>
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<paragraph pageId="1" pageNumber="28">
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From the Latin "
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<taxonomicName lsidName="insperatus" pageId="1" pageNumber="28" rank="species" species="insperatus">insperatus</taxonomicName>
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" for
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<normalizedToken originalValue="“unforeseen”">"unforeseen"</normalizedToken>
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, alluding to the unexpected discovery of a species of
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<taxonomicName class="Malacostraca" family="Chasmocarcinidae" genus="Australocarcinus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Australocarcinus" order="Decapoda" pageId="1" pageNumber="28" phylum="Arthropoda" rank="genus">Australocarcinus</taxonomicName>
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in the western Indian Ocean.
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</paragraph>
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</subSubSection>
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<subSubSection lastPageId="4" lastPageNumber="31" pageId="1" pageNumber="28" type="remarks">
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<paragraph pageId="1" pageNumber="28">Remarks.</paragraph>
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<paragraph pageId="1" pageNumber="28">
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Davie (1988) originally established
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<taxonomicName class="Malacostraca" family="Chasmocarcinidae" genus="Australocarcinus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Australocarcinus" order="Decapoda" pageId="1" pageNumber="28" phylum="Arthropoda" rank="genus">Australocarcinus</taxonomicName>
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for one freshwater species from northern Queensland in Australia,
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<taxonomicName lsidName="A. riparius" pageId="1" pageNumber="28" rank="species" species="riparius">A. riparius</taxonomicName>
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Davie, 1988. Davie & Guinot (1996) subsequently described two more species,
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<taxonomicName lsidName="A. kanaka" pageId="1" pageNumber="28" rank="species" species="kanaka">A. kanaka</taxonomicName>
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Davie & Guinot, 1996, and
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<taxonomicName lsidName="A. palauensis" pageId="1" pageNumber="28" rank="species" species="palauensis">A. palauensis</taxonomicName>
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Davie & Guinot, 1996, from New Caledonia and Palau, respectively. Davie & Guinot (1996) showed that
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<taxonomicName class="Malacostraca" family="Chasmocarcinidae" genus="Australocarcinus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Australocarcinus" order="Decapoda" pageId="1" pageNumber="28" phylum="Arthropoda" rank="genus">Australocarcinus</taxonomicName>
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was in the same subfamily as the more apomorphic cavernicolous species
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<taxonomicName class="Malacostraca" family="Chasmocarcinidae" genus="Trogloplax" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Trogloplax joliveti" order="Decapoda" pageId="1" pageNumber="28" phylum="Arthropoda" rank="species" species="joliveti">Trogloplax joliveti</taxonomicName>
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Guinot, 1986, from New Britain; that it belonged to the family
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<taxonomicName family="Chasmocarcinidae" lsidName="" pageId="1" pageNumber="28" rank="family">Chasmocarcinidae</taxonomicName>
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; and provided evidence that their larval development was truncated with the eggs hatching directly into juvenile crabs or megalopas.
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</paragraph>
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<paragraph lastPageId="4" lastPageNumber="31" pageId="1" pageNumber="28">
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<taxonomicName class="Malacostraca" family="Chasmocarcinidae" genus="Australocarcinus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Australocarcinus insperatus" order="Decapoda" pageId="1" pageNumber="28" phylum="Arthropoda" rank="species" species="insperatus">Australocarcinus insperatus</taxonomicName>
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sp. n., is morphologically most similar to
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<taxonomicName lsidName="A. riparius" pageId="1" pageNumber="28" rank="species" species="riparius">A. riparius</taxonomicName>
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Davie, 1988, in the anterolateral margin possessing four low teeth, the anteroexternal angle of
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<pageBreakToken pageId="2" pageNumber="29" start="start">the</pageBreakToken>
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merus of the third maxilliped is clearly auriculiform and the male telson is relatively longer.
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<taxonomicName class="Malacostraca" family="Chasmocarcinidae" genus="Australocarcinus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Australocarcinus insperatus" order="Decapoda" pageId="2" pageNumber="29" phylum="Arthropoda" rank="species" species="insperatus">Australocarcinus insperatus</taxonomicName>
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sp. n., however, can easily be separated by possessing a more sub-hexagonal carapace (Fig. 1B) (vs. carapace more subquadrate in
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<taxonomicName lsidName="A. riparius" pageId="2" pageNumber="29" rank="species" species="riparius">A. riparius</taxonomicName>
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, Fig. 4B); a distinctly convergent posterolateral margin (Fig. 1B) (vs. posterolateral margins subparallel in
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<taxonomicName lsidName="A. riparius" pageId="2" pageNumber="29" rank="species" species="riparius">A. riparius</taxonomicName>
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, Fig. 4B); the last anterolateral tooth is triangular and protrudes laterally beyond the carapace margin (Fig. 1B) (vs. last tooth truncate and not extending
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<pageBreakToken pageId="3" pageNumber="30" start="start">beyond</pageBreakToken>
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carapace margin in
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<taxonomicName lsidName="A. riparius" pageId="3" pageNumber="30" rank="species" species="riparius">A. riparius</taxonomicName>
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, Fig. 4B); the ischium of third maxilliped is wider than long (Fig. 1C) (vs. ischium longer than wide in
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<taxonomicName lsidName="A. riparius" pageId="3" pageNumber="30" rank="species" species="riparius">A. riparius</taxonomicName>
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, Fig. 4C); the ambulatory merus is more elongate and slender (Figs 1A, 2B, C, E) (vs. meri proportionately shorter
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<pageBreakToken pageId="4" pageNumber="31" start="start">in</pageBreakToken>
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<taxonomicName lsidName="A. riparius" pageId="4" pageNumber="31" rank="species" species="riparius">A. riparius</taxonomicName>
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, Fig. 4A); and the G1 is relatively more slender (Fig. 3
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<normalizedToken originalValue="A–D">A-D</normalizedToken>
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) (vs. G1 stouter in
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<taxonomicName lsidName="A. riparius" pageId="4" pageNumber="31" rank="species" species="riparius">A. riparius</taxonomicName>
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, cf.
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<bibRefCitation author="Ng, PKL" journalOrPublisher="Zootaxa" pageId="5" pageNumber="32" pagination="1 - 182" title="Revision of the family Chasmocarcinidae Serene, 1964 (Crustacea, Brachyura, Goneplacoidea)." url="https://doi.org/10.11646/zootaxa.4209.1.1" volume="4209" year="2016">Ng and Castro 2016</bibRefCitation>
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: fig. 98A).
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</paragraph>
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<caption pageId="4" pageNumber="31">
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<paragraph pageId="4" pageNumber="31">
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Figure 3.
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<taxonomicName class="Malacostraca" family="Chasmocarcinidae" genus="Australocarcinus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Australocarcinus insperatus" order="Decapoda" pageId="4" pageNumber="31" phylum="Arthropoda" rank="species" species="insperatus">Australocarcinus insperatus</taxonomicName>
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sp. n., left G1 and G2; holotype male (10.7
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<normalizedToken originalValue="×">x</normalizedToken>
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8.6 mm) (ZRC 2017.1072), Seychelles. A ventral view B ventral view C distal part (ventral view) D distal part (dorsal view) E ventral view F area between basal and distal segments. Scale bars 0.50 mm (A, B, E); 0.25 mm (C, D, F).
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</paragraph>
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</caption>
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<caption pageId="4" pageNumber="31">
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<paragraph pageId="4" pageNumber="31">
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Figure 4.
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<taxonomicName class="Malacostraca" family="Chasmocarcinidae" genus="Australocarcinus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Australocarcinus riparius" order="Decapoda" pageId="4" pageNumber="31" phylum="Arthropoda" rank="species" species="riparius">Australocarcinus riparius</taxonomicName>
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, male (8.8
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<normalizedToken originalValue="×">x</normalizedToken>
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10.2 mm) (ZRC 2006.167), Australia. A overall dorsal habitus B dorsal view of carapace (right side denuded) C right third maxilliped (denuded) D posterior thoracic sternum and pleon E anterior thoracic sternum and pleon F posterior thoracic sternum showing supplementary plate.
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</paragraph>
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</caption>
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<paragraph pageId="4" pageNumber="31">
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All three specimens of
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<taxonomicName lsidName="A. insperatus" pageId="4" pageNumber="31" rank="species" species="insperatus">A. insperatus</taxonomicName>
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sp. n. have a distinct cutting or peeling tooth at the base of the dactylus of the right chela (Fig. 2A), a character which
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<bibRefCitation author="Ng, PKL" journalOrPublisher="Journal of the Singapore National Academy of Science" pageId="5" pageNumber="32" pagination="195 - 199" title="The ' shell peeling' structure of the box crab Calappaphilargius (L.) and other crabs in relation to mollusc shell architecture." volume="13" year="1984">Ng and Tan (1984</bibRefCitation>
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,
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<bibRefCitation author="Ng, PKL" journalOrPublisher="Crustaceana" pageId="5" pageNumber="32" pagination="98 - 100" title="' Right Handedness' in heterochelous calappoid and xanthoid crabs - suggestion for a functional advantage." url="https://doi.org/10.1163/156854085X00288" volume="49" year="1985">1985</bibRefCitation>
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) have suggested is used to specially feed on gastropod snails. As most gastropod snails have dextral coiling (opening on the right side when viewed frontally),
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<bibRefCitation author="Ng, PKL" journalOrPublisher="Journal of the Singapore National Academy of Science" pageId="5" pageNumber="32" pagination="195 - 199" title="The ' shell peeling' structure of the box crab Calappaphilargius (L.) and other crabs in relation to mollusc shell architecture." volume="13" year="1984">Ng and Tan (1984</bibRefCitation>
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,
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<bibRefCitation author="Ng, PKL" journalOrPublisher="Crustaceana" pageId="5" pageNumber="32" pagination="98 - 100" title="' Right Handedness' in heterochelous calappoid and xanthoid crabs - suggestion for a functional advantage." url="https://doi.org/10.1163/156854085X00288" volume="49" year="1985">1985</bibRefCitation>
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) observed that crabs with the enlarged basal dactylar tooth always have this structure on the right chela to make peeling of the shell more efficient. The other three species of
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<taxonomicName class="Malacostraca" family="Chasmocarcinidae" genus="Australocarcinus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Australocarcinus" order="Decapoda" pageId="4" pageNumber="31" phylum="Arthropoda" rank="genus">Australocarcinus</taxonomicName>
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also have this tooth on the right chela (see
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<bibRefCitation author="Ng, PKL" journalOrPublisher="Zootaxa" pageId="5" pageNumber="32" pagination="1 - 182" title="Revision of the family Chasmocarcinidae Serene, 1964 (Crustacea, Brachyura, Goneplacoidea)." url="https://doi.org/10.11646/zootaxa.4209.1.1" volume="4209" year="2016">Ng and Castro 2016</bibRefCitation>
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: figs 95A, C, E) and on both sexes. This suggests that one of the main food items of
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<taxonomicName class="Malacostraca" family="Chasmocarcinidae" genus="Australocarcinus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Australocarcinus" order="Decapoda" pageId="4" pageNumber="31" phylum="Arthropoda" rank="genus">Australocarcinus</taxonomicName>
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are freshwater gastropods.
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</paragraph>
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<paragraph pageId="4" pageNumber="31">
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The discovery of
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<taxonomicName lsidName="A. insperatus" pageId="4" pageNumber="31" rank="species" species="insperatus">A. insperatus</taxonomicName>
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sp. n. is surprising as all the members of the
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<taxonomicName lsidName="" pageId="4" pageNumber="31" rank="subfamily" subfamily="Trogloplacinae">Trogloplacinae</taxonomicName>
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have been previously found in Australasian and Palau waters. Davie (1988) found juvenile crabs under the pleon of a female
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<taxonomicName lsidName="A. riparius" pageId="4" pageNumber="31" rank="species" species="riparius">A. riparius</taxonomicName>
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, with ovigerous specimens possessing some 70 large eggs.
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<bibRefCitation pageId="4" pageNumber="31">Davie and Guinot (1996)</bibRefCitation>
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found megalopa under a female pleon of
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<taxonomicName lsidName="A. kanaka" pageId="4" pageNumber="31" rank="species" species="kanaka">A. kanaka</taxonomicName>
|
||
, suggesting that the development was direct, like those in primary freshwater crabs like
|
||
<taxonomicName family="Potamidae" lsidName="" pageId="4" pageNumber="31" rank="family">Potamidae</taxonomicName>
|
||
,
|
||
<taxonomicName family="Potamonautidae" lsidName="" pageId="4" pageNumber="31" rank="family">Potamonautidae</taxonomicName>
|
||
and
|
||
<taxonomicName family="Gecarcinucidae" lsidName="" pageId="4" pageNumber="31" rank="family">Gecarcinucidae</taxonomicName>
|
||
(and some
|
||
<taxonomicName family="Sesarmidae" lsidName="" pageId="4" pageNumber="31" rank="family">Sesarmidae</taxonomicName>
|
||
). All trogloplacines also have large vulvae (
|
||
<bibRefCitation author="Ng, PKL" journalOrPublisher="Zootaxa" pageId="5" pageNumber="32" pagination="1 - 182" title="Revision of the family Chasmocarcinidae Serene, 1964 (Crustacea, Brachyura, Goneplacoidea)." url="https://doi.org/10.11646/zootaxa.4209.1.1" volume="4209" year="2016">Ng and Castro 2016</bibRefCitation>
|
||
: figs 99B, D, F, H), suggesting the eggs of the other two species,
|
||
<taxonomicName lsidName="A. palauensis" pageId="4" pageNumber="31" rank="species" species="palauensis">A. palauensis</taxonomicName>
|
||
and
|
||
<taxonomicName class="Malacostraca" family="Chasmocarcinidae" genus="Trogloplax" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Trogloplax joliveti" order="Decapoda" pageId="4" pageNumber="31" phylum="Arthropoda" rank="species" species="joliveti">Trogloplax joliveti</taxonomicName>
|
||
also have large eggs and do not have free-swimming larvae. The vulvae of
|
||
<taxonomicName lsidName="A. insperatus" pageId="4" pageNumber="31" rank="species" species="insperatus">A. insperatus</taxonomicName>
|
||
sp. n. are also large (Fig. 2G). If all trogloplacines have abbreviated (or at least a semi-abbreviated) development and there are no free-swimming larvae, how did they disperse so widely? Despite hypotheses that primary freshwater crabs may have dispersed through Gondwanic connections (
|
||
<bibRefCitation author="Ng, PKL" journalOrPublisher="Journal of Natural History" pageId="5" pageNumber="32" pagination="581 - 600" title="A revision of the family Deckeniidae Ortmann, 1897), with description of a new genus (Gecarcinucidae: Gecarcinucoidea) from the Seychelles, Indian Ocean." url="https://doi.org/10.1080/00222939500770201" volume="29" year="1995">Ng et al. 1995</bibRefCitation>
|
||
), the available evidence is that they are not old enough to have done so (see
|
||
<bibRefCitation author="Daniels, SR" journalOrPublisher="Molecular Phylogenetics and Evolution" pageId="5" pageNumber="32" pagination="227 - 235" title="Evolution of Afrotropical freshwater crab lineages obscured by convergence." url="https://doi.org/10.1016/j.ympev.2006.02.022" volume="40" year="2006">Daniels et al. 2006</bibRefCitation>
|
||
;
|
||
<bibRefCitation author="Cumberlidge, N" journalOrPublisher="Biological Journal of the Linnean Society" pageId="5" pageNumber="32" pagination="399 - 413" title="A revision of the higher taxonomy of the Afrotropical freshwater crabs (Decapoda: Brachyura) with a discussion of their biogeography." url="https://doi.org/10.1111/j.1095-8312.2007.00929.x" volume="93" year="2008">Cumberlidge et al. 2008</bibRefCitation>
|
||
;
|
||
<bibRefCitation author="Klaus, S" journalOrPublisher="Molecular Phylogenetics and Evolution" pageId="5" pageNumber="32" url="https://doi.org/10.1201/9781420092592-c26" year="2009">Klaus et al. 2009</bibRefCitation>
|
||
;
|
||
<bibRefCitation author="Cumberlidge, N" editor="Martin, JW" journalOrPublisher="Invertebrate Systematics" pageId="5" pageNumber="32" title="CRC Press, England" url="https://doi.org/10.1201/9781420092592-c25" year="2009">Cumberlidge and Ng 2009</bibRefCitation>
|
||
;
|
||
<bibRefCitation author="Daniels, SR" journalOrPublisher="Molecular Phylogenetics and Evolution" pageId="5" pageNumber="32" pagination="534 - 542" title="Reconstructing the colonization and diversification history of the endemic freshwater crab (Seychellumalluaudi) in the granitic and volcanic Seychelles Arichpelago." url="https://doi.org/10.1016/j.ympev.2011.07.015" volume="61" year="2011">Daniels 2011</bibRefCitation>
|
||
;
|
||
<bibRefCitation author="Cumberlidge, N" journalOrPublisher="Invertebrate Systematics" pageId="4" pageNumber="31" pagination="17 - 31" title="Recognition of two new species of freshwater crabs from the Seychelles based on molecular evidence (Potamoidea: Potamonautidae)." url="https://doi.org/10.1071/IS13017" volume="28" year="2014">Cumberlidge and Daniels 2014</bibRefCitation>
|
||
); and as such, the disjunct distribution of
|
||
<taxonomicName lsidName="A. insperatus" pageId="4" pageNumber="31" rank="species" species="insperatus">A. insperatus</taxonomicName>
|
||
sp. n. begs further studies. A complete molecular phylogeny of the
|
||
<taxonomicName family="Chasmocarcinidae" lsidName="" pageId="4" pageNumber="31" rank="family">Chasmocarcinidae</taxonomicName>
|
||
is now being undertaken by L. M. Tsang (Chinese University of Hong Kong) and the results should throw some light on this matter in the future.
|
||
</paragraph>
|
||
</subSubSection>
|
||
<subSubSection pageId="4" pageNumber="31" type="biology_ecology">
|
||
<paragraph pageId="4" pageNumber="31">Biology.</paragraph>
|
||
<paragraph pageId="4" pageNumber="31">The freshwater stream where the specimens were collected was shallow, the water flowing over a sandy bottom, with scattered rocks and construction rubble from past development works in the area. The crabs attempted to bury into the soft sand when disturbed.</paragraph>
|
||
</subSubSection>
|
||
</treatment>
|
||
</document> |