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<document ID-CLB-Dataset="25334" ID-DOI="http://dx.doi.org/10.3897/zookeys.877.38300" ID-GBIF-Dataset="1065a822-8f09-4bff-9f96-4df601b9b120" ID-PMC="PMC6785571" ID-Pensoft-Pub="1313-2970-877-1" ID-Pensoft-UUID="86AE3DEA82A85F1B9196AB4B31E79E8F" ID-PubMed="31616202" ModsDocID="1313-2970-877-1" checkinTime="1570026173025" checkinUser="pensoft" docAuthor="Shih, Hsi-Te, Hsu, Jhih-Wei, Wong, Kingsley J. H. &amp; Ng, Ngan Kee" docDate="2019" docId="676E9A4F051C525E930C93CA87289996" docLanguage="en" docName="ZooKeys 877: 1-29" docOrigin="ZooKeys 877" docSource="http://dx.doi.org/10.3897/zookeys.877.38300" docTitle="Metaplax tredecim Tweedie 1950" docType="treatment" docVersion="6" id="86AE3DEA82A85F1B9196AB4B31E79E8F" lastPageNumber="1" masterDocId="86AE3DEA82A85F1B9196AB4B31E79E8F" masterDocTitle="Review of the mudflat varunid crab genus Metaplax (Crustacea, Brachyura, Varunidae) from East Asia and northern Vietnam" masterLastPageNumber="29" masterPageNumber="1" pageNumber="1" updateTime="1732802365591" updateUser="ExternalLinkService">
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<mods:title id="8E44BAA4F4D962BCCC7347CFF0469A6D">Review of the mudflat varunid crab genus Metaplax (Crustacea, Brachyura, Varunidae) from East Asia and northern Vietnam</mods:title>
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<mods:namePart id="3FAC5A945658F40E801975D847910495">Shih, Hsi-Te</mods:namePart>
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<mods:namePart id="D89BA93D2BE6CD9CEC8996F6C35E63FD">Hsu, Jhih-Wei</mods:namePart>
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<mods:namePart id="8374B5AD060862A8D26DD4FF338ED7C5">Wong, Kingsley J. H.</mods:namePart>
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<mods:namePart id="97EB8DA3B83E10F9CD153D22E369E44F">Ng, Ngan Kee</mods:namePart>
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<mods:date id="96BA8B0C0AF9D466BA01CC7534EFD72E">2019</mods:date>
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<mods:number id="E3BE75D78468E2B5767B6E4CF797AED4">877</mods:number>
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<treatment id="676E9A4F051C525E930C93CA87289996" ID-GBIF-Taxon="159619261" LSID="urn:lsid:plazi:treatment:676E9A4F051C525E930C93CA87289996" httpUri="http://treatment.plazi.org/id/676E9A4F051C525E930C93CA87289996" lastPageNumber="1" pageId="0" pageNumber="1" scope_family="Varunidae" scope_infraOrder="Brachyura">
<subSubSection id="EC82296E65CEE43F5A663E2152B5539E" pageId="0" pageNumber="1" type="nomenclature">
<paragraph id="67582C130990BAC050144A13776FB50A" pageId="0" pageNumber="1">
<taxonomicName id="3D09252A6C799553F1920144F7432196" ID-CoL="42CCP" LSID="676E9A4F-051C-525E-930C-93CA87289996" authority="Tweedie, 1950" authorityName="Tweedie" authorityYear="1950" class="Malacostraca" family="Varunidae" genus="Metaplax" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Metaplax tredecim" order="Decapoda" pageId="0" pageNumber="1" phylum="Arthropoda" rank="species" species="tredecim">Metaplax tredecim Tweedie, 1950</taxonomicName>
<figureCitation id="DED726584218DBBEF4DAB6AADA663760" captionStart="Figure 2" captionStartId="F2" captionText="Figure 2. Metaplax elegans De Man, 1888 (A-C NCHUZOOL 15496, male, 12.7 mm), M. longipes Stimpson, 1858 (D-F ZRC 2019.0581, male, 14.9 mm), M. sheni Gordon, 1930 (G-I NCHUZOOL 15466, male, 9.9 mm), and M. tredecim Tweedie, 1950 (J-L paratype, ZRC 1964.7.14.4 - 18, 16.2 mm). A, D, G, J, A carapace B, E, H, K left infraorbital ridge C, F, I, L outer view of right cheliped. Scale bars: 1.0 mm." figureDoi="10.3897/zookeys.877.38300.figure2" httpUri="https://binary.pensoft.net/fig/343945" pageId="0" pageNumber="1" tableDoi="10.3897/zookeys.877.38300.figure2">
Figures 2
<normalizedToken id="1C01C951BDA75B6231FE1BF88200C0B1" originalValue="J–L">J-L</normalizedToken>
</figureCitation>
,
<figureCitation id="CBE8403B34A0592E5EF12119BFC7C96E" captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. Metaplax tredecim Tweedie, 1950. A, F Dorsal view B ventral view C left infraorbital ridge D right cheliped E right side of carapace showing the five teeth of lateral margin. A-E paratype male (CW 16.2 mm; ZRC 1964.7.14.4 - 18; Labuan) F male (CW 16.5 mm; NCHUZOOL 15473; Hong Kong) G male (CW 15.4 mm; NCHUZOOL 15475; Labuan, Malaysia) H, I male (18.2 mm; NCHUZOOL 15705; Hong Kong) G-I color in life. Scale bars: 2.0 mm." figureDoi="10.3897/zookeys.877.38300.figure6" httpUri="https://binary.pensoft.net/fig/343949" pageId="0" pageNumber="1" tableDoi="10.3897/zookeys.877.38300.figure6">6</figureCitation>
,
<figureCitation id="9BE15157543D3198A2688B0B6921EF02" captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Metaplax elegans De Man, 1888 (A-D NCHUZOOL 15496, male, 12.7 mm), right G 1; M. longipes Stimpson, 1858 (E-H ZRC 2019.0581, male, 14.9 mm), right G 1; M. sheni Gordon, 1930 (I-L NCHUZOOL 15466, male, 9.9 mm), right G 1; and M. tredecim Tweedie, 1950 (M-P paratype, ZRC 1964.7.14.4 - 18, 16.2 mm), left G 1. Scale bars: 0.5 mm (A-H, M-P); 0.2 mm (I-L)." figureDoi="10.3897/zookeys.877.38300.figure7" httpUri="https://binary.pensoft.net/fig/343950" pageId="0" pageNumber="1" tableDoi="10.3897/zookeys.877.38300.figure7">
7
<normalizedToken id="CD1CF1017D45E3711D1AE7340A030E1B" originalValue="M–P">M-P</normalizedToken>
</figureCitation>
</paragraph>
</subSubSection>
<subSubSection id="0DA2B31EE153A7AA4DC1153722F51845" pageId="0" pageNumber="1" type="reference_group">
<paragraph id="56369F74FFF6BACB598AC357DA39881C" pageId="0" pageNumber="1">
<taxonomicName id="5C404FDE52B028F8416A98164A2F51B8" class="Malacostraca" family="Varunidae" genus="Metaplax" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Metaplax tredecim" order="Decapoda" pageId="0" pageNumber="1" phylum="Arthropoda" rank="species" species="tredecim">Metaplax tredecim</taxonomicName>
Tweedie, 1950: 354, fig. 6 (type locality: Labuan, Malaysia);
<bibRefCitation id="8045C51E2C1304EBF7C6EB9A6E72CA42" DOI="https://doi.org/10.1007/BF00005670" author="Choy, SC" journalOrPublisher="Hydrobiologia" pageId="0" pageNumber="1" pagination="237 - 247" refId="B9" refString="Choy, SC, Booth, WE, 1994. Prolonged inundation and ecological changes in an Avicennia mangrove: implications for conservation and management. Hydrobiologia 285: 237 - 247" title="Prolonged inundation and ecological changes in an Avicennia mangrove: implications for conservation and management." url="https://doi.org/10.1007/BF00005670" volume="285" year="1994">Choy and Booth 1994</bibRefCitation>
: 243 (Brunei);
<bibRefCitation id="035DC177FFB4E1D349C68DED07BD9E09" author="Davie, PJF" journalOrPublisher="Raffles Bulletin of Zoology" pageId="0" pageNumber="1" pagination="379 - 386" refId="B15" refString="Davie, PJF, Nguyen, VX, 2003. A new species of Metaplax (Crustacea: Brachyura: Varunidae: Cyclograpsinae) from Vietnam. Raffles Bulletin of Zoology 51: 379 - 386" title="A new species of Metaplax (Crustacea: Brachyura: Varunidae: Cyclograpsinae) from Vietnam." volume="51" year="2003">Davie and Nguyen 2003</bibRefCitation>
: 383, fig. 1
<normalizedToken id="3EAA7C9B4B95BAD57365B31B4E98B9CF" originalValue="d–e">d-e</normalizedToken>
(Malaysia: Labuan; Brunei);
<bibRefCitation id="94FE37E5595375DBBDEE66B41D8DAF75" author="Ng, PKL" journalOrPublisher="Raffles Bulletin of Zoology, Supplement" pageId="0" pageNumber="1" pagination="1 - 296" refId="B56" refString="Ng, PKL, Guinot, D, Davie, PJF, 2008. Systema Brachyurorum: Part I. An annotated checklist of extant brachyuran crabs of the world. Raffles Bulletin of Zoology, Supplement 17: 1 - 296" title="Systema Brachyurorum: Part I. An annotated checklist of extant brachyuran crabs of the world." volume="17" year="2008">Ng et al. 2008</bibRefCitation>
: 226 (list);
<bibRefCitation id="39A0FE61B909880E4FA18195EB3EB6A6" pageId="0" pageNumber="1" refId="B94">Yang et al. 2008</bibRefCitation>
: 803 (list; East China and South China seas).
</paragraph>
<paragraph id="CAADD033E34C801EDEA8795963A1534E" pageId="0" pageNumber="1">
<taxonomicName id="93913446AC737FE044833C01F4CC8A9D" class="Malacostraca" family="Varunidae" genus="Metaplax" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Metaplax longipes" order="Decapoda" pageId="0" pageNumber="1" phylum="Arthropoda" rank="species" species="longipes">Metaplax longipes</taxonomicName>
:
<bibRefCitation id="20E516B579B3F40E7BE48BF7B7C8744A" author="Dai, AY" journalOrPublisher="China Ocean Press, Beijing" pageId="0" pageNumber="1" refId="B13" refString="Dai, AY, Yang, SL, Song, YZ, Chen, GX, 1986. Crabs of the China seas. China Ocean Press, Beijing" title="Crabs of the China seas." year="1986">Dai et al. 1986</bibRefCitation>
: 508, fig. 288 (1-2), pl. 72(3) (China: Zhejiang, Fujian, Guangdong) (part);
<bibRefCitation id="E342862939B55F1B358D2F48C9E27FF4" author="Dai, AY" journalOrPublisher="China Ocean Press, Beijing" pageId="0" pageNumber="1" refId="B12" refString="Dai, AY, Yang, SL, 1991. Crabs of the China Seas. China Ocean Press, Beijing" title="Crabs of the China Seas." year="1991">Dai and Yang 1991</bibRefCitation>
: 556, fig. 288 (1-2), pl. 72(3) (China: Zhejiang, Fujian, Guangdong) (part);
<bibRefCitation id="BE705C36B71CE30FBB3D86D274B0EDC5" pageId="0" pageNumber="1" refId="B8">Chertoprud et al. 2012</bibRefCitation>
: 276, pl. 47F (Vietnam: Nha Phu, Nha Trang, Khanh Hoa) (not
<taxonomicName id="A6733AA4129F8F6B33688238DBF535EB" class="Malacostraca" family="Varunidae" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="M. longipes" order="Decapoda" pageId="0" pageNumber="1" phylum="Arthropoda" rank="species" species="longipes">M. longipes</taxonomicName>
Stimpson, 1858).
</paragraph>
</subSubSection>
<subSubSection id="390B9A1F9B1F09D7ED3ECA01F281E940" pageId="0" pageNumber="1" type="materials_examined">
<paragraph id="04921EBD98A6EC794B705C266480D053" pageId="0" pageNumber="1">Materials examined.</paragraph>
<paragraph id="F4343CA1935A94C95567665FA8DBA255" pageId="0" pageNumber="1">
<emphasis id="3D8FF1BBA936BA1DD5008D8958EEAB0B" bold="true" pageId="0" pageNumber="1">Paratypes</emphasis>
: 2 ♂♂ (15.6-16.2 mm), 1 ♀ (15.7 mm) (ZRC 1964.7.14.4-18), Labuan, Malaysia, coll. G. Nunong, Aug. 1938.
<emphasis id="1AFC5E779F5407D0C35460ACF8A261C3" bold="true" pageId="0" pageNumber="1">Others. Hong Kong</emphasis>
: 1 ♂ (14.2 mm) (NCHUZOOL 15468), Starfish Bay, coll. P.-C. Tsai and H. Y. Cheung, 19 July 2015; 3 ♂♂ (16.4-19.4 mm) (NCHUZOOL 15546), Starfish Bay, coll. K. J. H. Wong, 4 June 2019; 1 ♂ (16.1 mm) (NCHUZOOL 15469), Tai Tan, coll. K. J. H. Wong, 15 July 2015; 1 ♂ (18.1 mm) (NCHUZOOL 15470), Ting Kok, coll. K. J. H. Wong, 22 Aug. 2017; 2 ♂♂ (12.8-16.2 mm), 1 ♀ (15.6 mm) (NCHUZOOL 15471), Kei Ling Ha, coll. K. J. H. Wong, 31 Aug. 2011; 3 ♂♂ (16.9-21.0 mm) (NCHUZOOL 15472), Nai Chung, coll. K. J. H. Wong, 23 June 2015; 2 ♂♂ (16.5-21.5 mm) (NCHUZOOL 15473), Luk Keng, coll. C. W. Lau, 22 May 2016; 1 ♂ (18.2 mm) (NCHUZOOL 15705), Mak Pin, Sai Kung, coll. K. J. H. Wong, 7 July 2019.
<emphasis id="4FAF913F5FCA3FBDE336159E1F9F8DD4" bold="true" pageId="0" pageNumber="1">China</emphasis>
: 4 ♂♂ (18.0-22.7 mm), 1 ♀ (10.7 mm) (NCHUZOOL 15474), Dongzhai Harbor, Hainan, 23 June 2004.
<emphasis id="63823C8844A7483DD5E1B436BD6ED84C" bold="true" pageId="0" pageNumber="1">Vietnam</emphasis>
: Quang Ninh: 1 ♂ (21.8 mm), 2 ♀♀ (15.7-23.4 mm) (NCHUZOOL 15476), Dong Rui, 29 May 2016; 1 ♂ (22.4 mm) (NCHUZOOL 15477), Dong Rui, coll. H.-T. Shih and P.-Y. Hsu, 9 Oct. 2017; 1 ♀ (10.3 mm) (NCHUZOOL 15478), Dong Rui, coll. H.-T. Shih and P.-Y. Hsu, 9 Oct. 2017; Khanh Hoa: 4 ♂♂ (14.4-18.7 mm), 5 ♀♀ (12.6-16.1 mm) (NCHUZOOL 15498), Nha Trang, coll. I.-H. Chen and K. J. H. Wong, 24 Nov. 2010.
<emphasis id="974DF6EEB40BF3098F6367B3023ABD60" bold="true" pageId="0" pageNumber="1">Malaysia</emphasis>
: Labuan, 1 ♂ (15.4 mm), 1 ♀ (16.2 mm) (NCHUZOOL 15475), coll. H.-T. Shih, 23 July 2010; 1 ♂ (17.1 mm) (NCHUZOOL 15497), coll. H.-T. Shih, 27 July 2010.
</paragraph>
</subSubSection>
<subSubSection id="05F737575695C6C7779424774EF1D069" pageId="0" pageNumber="1" type="diagnosis">
<paragraph id="01ADD92C5EA9D9219394CE4550EC0D82" pageId="0" pageNumber="1">Diagnosis.</paragraph>
<paragraph id="7FE7971CEC35D3A2CB2F918B167C8426" pageId="0" pageNumber="1">
Carapace (
<figureCitation id="54ECB222F757394938034EA6564F5C73" captionStart="Figure 2" captionStartId="F2" captionText="Figure 2. Metaplax elegans De Man, 1888 (A-C NCHUZOOL 15496, male, 12.7 mm), M. longipes Stimpson, 1858 (D-F ZRC 2019.0581, male, 14.9 mm), M. sheni Gordon, 1930 (G-I NCHUZOOL 15466, male, 9.9 mm), and M. tredecim Tweedie, 1950 (J-L paratype, ZRC 1964.7.14.4 - 18, 16.2 mm). A, D, G, J, A carapace B, E, H, K left infraorbital ridge C, F, I, L outer view of right cheliped. Scale bars: 1.0 mm." figureDoi="10.3897/zookeys.877.38300.figure2" httpUri="https://binary.pensoft.net/fig/343945" pageId="0" pageNumber="1" tableDoi="10.3897/zookeys.877.38300.figure2">Figs 2J</figureCitation>
,
<figureCitation id="FC7AC3BB86BD631798729ACCC1D167C8" captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. Metaplax tredecim Tweedie, 1950. A, F Dorsal view B ventral view C left infraorbital ridge D right cheliped E right side of carapace showing the five teeth of lateral margin. A-E paratype male (CW 16.2 mm; ZRC 1964.7.14.4 - 18; Labuan) F male (CW 16.5 mm; NCHUZOOL 15473; Hong Kong) G male (CW 15.4 mm; NCHUZOOL 15475; Labuan, Malaysia) H, I male (18.2 mm; NCHUZOOL 15705; Hong Kong) G-I color in life. Scale bars: 2.0 mm." figureDoi="10.3897/zookeys.877.38300.figure6" httpUri="https://binary.pensoft.net/fig/343949" pageId="0" pageNumber="1" tableDoi="10.3897/zookeys.877.38300.figure6">6A, F, G</figureCitation>
) subquadrate, 1.35 times broader than long (
<emphasis id="369CA45B6945DFBD2ED046009AD8A25E" italics="true" pageId="0" pageNumber="1">N</emphasis>
= 39, SD = 0.03), regions defined by shallow grooves, slightly inflated, surface pitted; front nearly straight, medially slightly concave; lateral margin mildly convex, posteriorly converging, cut into five teeth, anterior two pronounced, quadrate, posterior two inconspicuous; posterolateral facet slightly depressed, behind second notch decorated with two short oblique granular ridges. Infraorbital ridge (
<figureCitation id="E7FF809A70591367D7D1BA19995FCC3A" captionStart="Figure 2" captionStartId="F2" captionText="Figure 2. Metaplax elegans De Man, 1888 (A-C NCHUZOOL 15496, male, 12.7 mm), M. longipes Stimpson, 1858 (D-F ZRC 2019.0581, male, 14.9 mm), M. sheni Gordon, 1930 (G-I NCHUZOOL 15466, male, 9.9 mm), and M. tredecim Tweedie, 1950 (J-L paratype, ZRC 1964.7.14.4 - 18, 16.2 mm). A, D, G, J, A carapace B, E, H, K left infraorbital ridge C, F, I, L outer view of right cheliped. Scale bars: 1.0 mm." figureDoi="10.3897/zookeys.877.38300.figure2" httpUri="https://binary.pensoft.net/fig/343945" pageId="0" pageNumber="1" tableDoi="10.3897/zookeys.877.38300.figure2">Figs 2K</figureCitation>
,
<figureCitation id="F0C281DE8744F6BF92752B0E13EE27C0" captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. Metaplax tredecim Tweedie, 1950. A, F Dorsal view B ventral view C left infraorbital ridge D right cheliped E right side of carapace showing the five teeth of lateral margin. A-E paratype male (CW 16.2 mm; ZRC 1964.7.14.4 - 18; Labuan) F male (CW 16.5 mm; NCHUZOOL 15473; Hong Kong) G male (CW 15.4 mm; NCHUZOOL 15475; Labuan, Malaysia) H, I male (18.2 mm; NCHUZOOL 15705; Hong Kong) G-I color in life. Scale bars: 2.0 mm." figureDoi="10.3897/zookeys.877.38300.figure6" httpUri="https://binary.pensoft.net/fig/343949" pageId="0" pageNumber="1" tableDoi="10.3897/zookeys.877.38300.figure6">6C</figureCitation>
) markedly sexually dimorphic: in males medial four or five roughly same size, decreasing in breadth laterally, laterally of a row of seven or eight small, rounded, isomorphic, tubercles; females with 21-27 small isomorphic tubercles. Chelipeds (
<figureCitation id="94B3DB54FCC26FA18D10B189A0D0B259" captionStart="Figure 2" captionStartId="F2" captionText="Figure 2. Metaplax elegans De Man, 1888 (A-C NCHUZOOL 15496, male, 12.7 mm), M. longipes Stimpson, 1858 (D-F ZRC 2019.0581, male, 14.9 mm), M. sheni Gordon, 1930 (G-I NCHUZOOL 15466, male, 9.9 mm), and M. tredecim Tweedie, 1950 (J-L paratype, ZRC 1964.7.14.4 - 18, 16.2 mm). A, D, G, J, A carapace B, E, H, K left infraorbital ridge C, F, I, L outer view of right cheliped. Scale bars: 1.0 mm." figureDoi="10.3897/zookeys.877.38300.figure2" httpUri="https://binary.pensoft.net/fig/343945" pageId="0" pageNumber="1" tableDoi="10.3897/zookeys.877.38300.figure2">Figs 2L</figureCitation>
,
<figureCitation id="98651AD57DBF190C7CE984721D041B9E" captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. Metaplax tredecim Tweedie, 1950. A, F Dorsal view B ventral view C left infraorbital ridge D right cheliped E right side of carapace showing the five teeth of lateral margin. A-E paratype male (CW 16.2 mm; ZRC 1964.7.14.4 - 18; Labuan) F male (CW 16.5 mm; NCHUZOOL 15473; Hong Kong) G male (CW 15.4 mm; NCHUZOOL 15475; Labuan, Malaysia) H, I male (18.2 mm; NCHUZOOL 15705; Hong Kong) G-I color in life. Scale bars: 2.0 mm." figureDoi="10.3897/zookeys.877.38300.figure6" httpUri="https://binary.pensoft.net/fig/343949" pageId="0" pageNumber="1" tableDoi="10.3897/zookeys.877.38300.figure6">6D</figureCitation>
) stout, symmetrical, palm 2.3 times longer than broad, length of palm approximately 1.6 times of length of dactyl (
<emphasis id="6932A95EB181BC44F80D54931B21CEA8" italics="true" pageId="0" pageNumber="1">N</emphasis>
= 12), meri slightly dilated anteriorly, lined with minute denticles along the margin; chela surface finely granulated, along cutting edges both fingers unarmed. Ambulatory legs slender, elongated, meri of P3 and P4 tomentum-covered on distal half, and propodi of P2 to P4 with thick mat of setae. G1 (
<figureCitation id="6006BE4171445F64193358A498E87092" captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Metaplax elegans De Man, 1888 (A-D NCHUZOOL 15496, male, 12.7 mm), right G 1; M. longipes Stimpson, 1858 (E-H ZRC 2019.0581, male, 14.9 mm), right G 1; M. sheni Gordon, 1930 (I-L NCHUZOOL 15466, male, 9.9 mm), right G 1; and M. tredecim Tweedie, 1950 (M-P paratype, ZRC 1964.7.14.4 - 18, 16.2 mm), left G 1. Scale bars: 0.5 mm (A-H, M-P); 0.2 mm (I-L)." figureDoi="10.3897/zookeys.877.38300.figure7" httpUri="https://binary.pensoft.net/fig/343950" pageId="0" pageNumber="1" tableDoi="10.3897/zookeys.877.38300.figure7">
Fig. 7
<normalizedToken id="90F3953BE1B3CE07146D3F1CB9CDF23D" originalValue="M–P">M-P</normalizedToken>
</figureCitation>
) elongated, slender, almost straight.
</paragraph>
</subSubSection>
<subSubSection id="A98BE72239FAA493AB14E02DD91B7BE2" pageId="0" pageNumber="1" type="distribution">
<paragraph id="67744B38F60F311EE4E26987C79A1E09" pageId="0" pageNumber="1">Distribution.</paragraph>
<paragraph id="815E2A170C25454AEC17D0935FFFB75C" pageId="0" pageNumber="1">
Southeast and East Asia: northern Borneo (Labuan, Malaysia; Brunei), Vietnam (Quang Ninh; Khanh Hoa), and South China (Hong Kong) (
<figureCitation id="842BD0CAB411C270396C42262123E464" captionStart="Figure 1" captionStartId="F1" captionText="Figure 1. Collection sites (solid symbols) for species of the genus Metaplax used in this study: green rhombus for M. elegans; red circles for M. longipes; blue triangles for M. sheni; and purple squares for M. tredecim. Empty symbols mean the additional records from references (see synonym lists for each species)." figureDoi="10.3897/zookeys.877.38300.figure1" httpUri="https://binary.pensoft.net/fig/343944" pageId="0" pageNumber="1" tableDoi="10.3897/zookeys.877.38300.figure1">Fig. 1</figureCitation>
).
</paragraph>
</subSubSection>
<subSubSection id="85D107AF7401D6AE6E120D4293DB0AD7" pageId="0" pageNumber="1" type="habitat">
<paragraph id="206470171EC103C68308A6EC63A68E40" pageId="0" pageNumber="1">Habitat.</paragraph>
<paragraph id="82013DD8B9C7D7BC6BFF4F2EBA1EBE2F" pageId="0" pageNumber="1">
In Hong Kong, in comparison to
<taxonomicName id="3ADFAE161CC81AE58B3898772B0F4C1B" lsidName="M. longipes" pageId="0" pageNumber="1" rank="species" species="longipes">
<emphasis id="68F42221EE2FFE62147A71063DCEB501" italics="true" pageId="0" pageNumber="1">M. longipes</emphasis>
</taxonomicName>
,
<taxonomicName id="716A02B1BD443279268528F8A2454EBD" lsidName="M. tredecim" pageId="0" pageNumber="1" rank="species" species="tredecim">
<emphasis id="CE8A8A4DBAD0E6D18059BE8E23DD1D5B" italics="true" pageId="0" pageNumber="1">M. tredecim</emphasis>
</taxonomicName>
tends to occur in habitats of coarser, grittier substrates, with less freshwater input, and frequently on open sandflats rather unsheltered by mangroves.
</paragraph>
</subSubSection>
<subSubSection id="4A200EADD6718F4AE7AB3CB5BA745122" pageId="0" pageNumber="1" type="remarks">
<paragraph id="B86E7C8AA94461E2999AE041BB2F0AB2" pageId="0" pageNumber="1">Remarks.</paragraph>
<paragraph id="EE12E3FD58675B441D25A00AEBCEB2C1" pageId="0" pageNumber="1">
Identification of the
<taxonomicName id="B5398E0B02C67CAD4D80BF2C47B28239" class="Malacostraca" family="Varunidae" genus="Metaplax" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Metaplax tredecim" order="Decapoda" pageId="0" pageNumber="1" phylum="Arthropoda" rank="species" species="tredecim">
<emphasis id="9B6919297BCC9A7B450704E50FC199DD" italics="true" pageId="0" pageNumber="1">Metaplax tredecim</emphasis>
</taxonomicName>
had been confusing, particularly based on the number of teeth along the lateral margin of the carapace.
<bibRefCitation id="790814D9976533E13A8FD690F45EF026" author="Tweedie, MWF" journalOrPublisher="Sarawak Museum Journal" pageId="0" pageNumber="1" pagination="338 - 369" refId="B85" refString="Tweedie, MWF, 1950. Grapsoid crabs from Labuan and Sarawak. Sarawak Museum Journal 5: 338 - 369" title="Grapsoid crabs from Labuan and Sarawak." volume="5" year="1950">Tweedie (1950</bibRefCitation>
: fig. 6) showed merely three conspicuous lobes, the posterior one occupying more than half of carapace length. However, as noted by
<bibRefCitation id="4DE2D0C1243C21669B634994D80F5B2E" author="Davie, PJF" journalOrPublisher="Raffles Bulletin of Zoology" pageId="0" pageNumber="1" pagination="379 - 386" refId="B15" refString="Davie, PJF, Nguyen, VX, 2003. A new species of Metaplax (Crustacea: Brachyura: Varunidae: Cyclograpsinae) from Vietnam. Raffles Bulletin of Zoology 51: 379 - 386" title="A new species of Metaplax (Crustacea: Brachyura: Varunidae: Cyclograpsinae) from Vietnam." volume="51" year="2003">Davie and Nguyen (2003)</bibRefCitation>
, members of the genus often have the structures around the posterolateral facet obscured by setae-trapped sediments, and not visible unless carefully denuded. Reexamination of a paratype male (16.2 mm; ZRC 1964.7.14.4-18), after denudation, showed the lateral margin to be interrupted by 4 notches (hence 5 teeth) (
<figureCitation id="BE5A55CBD4CFAD143E43C6BC57FCC990" captionStart="Figure 2" captionStartId="F2" captionText="Figure 2. Metaplax elegans De Man, 1888 (A-C NCHUZOOL 15496, male, 12.7 mm), M. longipes Stimpson, 1858 (D-F ZRC 2019.0581, male, 14.9 mm), M. sheni Gordon, 1930 (G-I NCHUZOOL 15466, male, 9.9 mm), and M. tredecim Tweedie, 1950 (J-L paratype, ZRC 1964.7.14.4 - 18, 16.2 mm). A, D, G, J, A carapace B, E, H, K left infraorbital ridge C, F, I, L outer view of right cheliped. Scale bars: 1.0 mm." figureDoi="10.3897/zookeys.877.38300.figure2" httpUri="https://binary.pensoft.net/fig/343945" pageId="0" pageNumber="1" tableDoi="10.3897/zookeys.877.38300.figure2">Figs 2J</figureCitation>
,
<figureCitation id="424CABFC148D069E9A739D6DF72E2D8D" captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. Metaplax tredecim Tweedie, 1950. A, F Dorsal view B ventral view C left infraorbital ridge D right cheliped E right side of carapace showing the five teeth of lateral margin. A-E paratype male (CW 16.2 mm; ZRC 1964.7.14.4 - 18; Labuan) F male (CW 16.5 mm; NCHUZOOL 15473; Hong Kong) G male (CW 15.4 mm; NCHUZOOL 15475; Labuan, Malaysia) H, I male (18.2 mm; NCHUZOOL 15705; Hong Kong) G-I color in life. Scale bars: 2.0 mm." figureDoi="10.3897/zookeys.877.38300.figure6" httpUri="https://binary.pensoft.net/fig/343949" pageId="0" pageNumber="1" tableDoi="10.3897/zookeys.877.38300.figure6">6A, E</figureCitation>
), the posterior two being inconspicuously defined by the last notch.
</paragraph>
<paragraph id="944CD4238DBFDAC3347A96AF064BFB8A" pageId="0" pageNumber="1">
As mentioned above, two forms, differing in the number of tubercles or lobes on the infraorbital ridge, were recognized in specimens identified with
<taxonomicName id="A628D0B7A12F76E470F96FFFE93D1A2B" lsidName="M. longipes" pageId="0" pageNumber="1" rank="species" species="longipes">
<emphasis id="EBDEE79AB42F9C15BF213A7B5A33B714" italics="true" pageId="0" pageNumber="1">M. longipes</emphasis>
</taxonomicName>
by
<bibRefCitation id="12CAA3B7D827B74775951F65AFD5AA4F" author="Dai, AY" journalOrPublisher="China Ocean Press, Beijing" pageId="0" pageNumber="1" refId="B13" refString="Dai, AY, Yang, SL, Song, YZ, Chen, GX, 1986. Crabs of the China seas. China Ocean Press, Beijing" title="Crabs of the China seas." year="1986">Dai et al. (1986)</bibRefCitation>
and
<bibRefCitation id="B41DB1F4D30128BABF4AAAD40A2C5E94" author="Dai, AY" journalOrPublisher="China Ocean Press, Beijing" pageId="0" pageNumber="1" refId="B12" refString="Dai, AY, Yang, SL, 1991. Crabs of the China Seas. China Ocean Press, Beijing" title="Crabs of the China Seas." year="1991">Dai and Yang (1991)</bibRefCitation>
. We confirmed that specimens from the study area, characterized by the possession of about 17 tubercles or lobes closely represent
<taxonomicName id="B281E3A758789747F5615785ED3355B2" lsidName="M. tredecim" pageId="0" pageNumber="1" rank="species" species="tredecim">
<emphasis id="A7DEEC652FB335066AF4A345526F477A" italics="true" pageId="0" pageNumber="1">M. tredecim</emphasis>
</taxonomicName>
. There is little doubt that the material studied by
<bibRefCitation id="AFC8564F17629D6BA4BE6DD326C1E2AF" author="Dai, AY" journalOrPublisher="China Ocean Press, Beijing" pageId="0" pageNumber="1" refId="B13" refString="Dai, AY, Yang, SL, Song, YZ, Chen, GX, 1986. Crabs of the China seas. China Ocean Press, Beijing" title="Crabs of the China seas." year="1986">Dai et al. (1986)</bibRefCitation>
and
<bibRefCitation id="2A8821B4B6E1B9D88E0BCB410D01A64E" author="Dai, AY" journalOrPublisher="China Ocean Press, Beijing" pageId="0" pageNumber="1" refId="B12" refString="Dai, AY, Yang, SL, 1991. Crabs of the China Seas. China Ocean Press, Beijing" title="Crabs of the China Seas." year="1991">Dai and Yang (1991)</bibRefCitation>
included two species,
<taxonomicName id="75E76FC5CD8D0287670C29B1900151B9" lsidName="M. longipes" pageId="0" pageNumber="1" rank="species" species="longipes">
<emphasis id="DD45902EDD7B1A2915097D0F33C932E0" italics="true" pageId="0" pageNumber="1">M. longipes</emphasis>
</taxonomicName>
and
<taxonomicName id="92B1F9AF4E4E668DD0C7ED8C7F0CD093" lsidName="M. tredecim" pageId="0" pageNumber="1" rank="species" species="tredecim">
<emphasis id="9CE5B95F3DC9DDCB1A1CADA3E26FCCFF" italics="true" pageId="0" pageNumber="1">M. tredecim</emphasis>
</taxonomicName>
.
</paragraph>
<paragraph id="4CE91846E17700363A9F88E239F350AA" pageId="0" pageNumber="1">
<bibRefCitation id="A5C38B4CEAD97D608078E0B50872536F" pageId="0" pageNumber="1" refId="B8">Chertoprud et al. (2012)</bibRefCitation>
recorded &quot;
<taxonomicName id="F9374522D1DA7F692ACAA6B1DCE83542" lsidName="M. longipes" pageId="0" pageNumber="1" rank="species" species="longipes">
<emphasis id="58635666D92A7500EBB82CBDE740CFB7" italics="true" pageId="0" pageNumber="1">M. longipes</emphasis>
</taxonomicName>
&quot; from Nha Phu, southeastern Vietnam. However, given the infraorbital ridge with 17 tubercles and the chelipeds with the length of palm/the length of dactyl ratio about 1.5 (estimated from their plate 47F on page 295), this record is suspected to represent
<taxonomicName id="77BFEDA0AEE0A1B160946AB9A9DF7370" lsidName="M. tredecim" pageId="0" pageNumber="1" rank="species" species="tredecim">
<emphasis id="B271D17B7EAE46402519E7E65264D5E5" italics="true" pageId="0" pageNumber="1">M. tredecim</emphasis>
</taxonomicName>
instead (see Table
<tableCitation id="4B67E8A6E23E2B0A00538475A1886DC9" captionStartId="T2" httpUri="http://table.plazi.org/id/2CCAB3CE4375FA31438947C2ED9CEA7C" pageId="0" pageNumber="1" tableUuid="2CCAB3CE4375FA31438947C2ED9CEA7C">2</tableCitation>
).
</paragraph>
<caption id="BDFAD55C075A8FFAB40B9B384EA4DC2F" doi="10.3897/zookeys.877.38300.figure6" httpUri="https://binary.pensoft.net/fig/343949" pageId="0" pageNumber="1" start="Figure 6" startId="F6">
<paragraph id="7E2B6E45C983DBE80A52B06FF83F9B45" pageId="0" pageNumber="1">
<emphasis id="9BF75F4062E6C56B9B7C60DBBBA2F5C1" bold="true" pageId="0" pageNumber="1">Figure 6.</emphasis>
<taxonomicName id="DF0FD19552CD1403C010FAC1B30945FC" class="Malacostraca" family="Varunidae" genus="Metaplax" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Metaplax tredecim" order="Decapoda" pageId="0" pageNumber="1" phylum="Arthropoda" rank="species" species="tredecim">
<emphasis id="4D11633156B2D188183D3335D715C5CB" italics="true" pageId="0" pageNumber="1">Metaplax tredecim</emphasis>
</taxonomicName>
Tweedie, 1950.
<emphasis id="6A60FD1E4E58D992234FCD57239E7EFF" bold="true" pageId="0" pageNumber="1">A, F</emphasis>
Dorsal view
<emphasis id="7BD362CB6A7452E153D9B08AEF873F79" bold="true" pageId="0" pageNumber="1">B</emphasis>
ventral view
<emphasis id="EBFD6E4104D64D961A3CD4B57E86D02E" bold="true" pageId="0" pageNumber="1">C</emphasis>
left infraorbital ridge
<emphasis id="C1124D6EEEE882FCDBEAEB4B6DAF2DB2" bold="true" pageId="0" pageNumber="1">D</emphasis>
right cheliped
<emphasis id="55113C8241AF2DEAD9F05DEE3E3A2778" bold="true" pageId="0" pageNumber="1">E</emphasis>
right side of carapace showing the five teeth of lateral margin.
<emphasis id="05A10D7A62D951B97741945236E538D6" bold="true" pageId="0" pageNumber="1">
<normalizedToken id="3ABE709EF2A5A3A368C9C24DB0DF1A7C" originalValue="A–E">A-E</normalizedToken>
</emphasis>
paratype male (CW 16.2 mm; ZRC 1964.7.14.4-18; Labuan)
<emphasis id="EBD5AB72AF78E808DA8F4497FEF0E622" bold="true" pageId="0" pageNumber="1">F</emphasis>
male (CW 16.5 mm; NCHUZOOL 15473; Hong Kong)
<emphasis id="B0E458991E96140EE9695903EE8EB5D1" bold="true" pageId="0" pageNumber="1">G</emphasis>
male (CW 15.4 mm; NCHUZOOL 15475; Labuan, Malaysia)
<emphasis id="50589FEF7B25DE69C9BB9476F1DC459A" bold="true" pageId="0" pageNumber="1">H, I</emphasis>
male (18.2 mm; NCHUZOOL 15705; Hong Kong)
<emphasis id="7B4C362D89FEA890EDEA4512A4C92BFF" bold="true" pageId="0" pageNumber="1">
<normalizedToken id="24C253989120A5C2AFD388FD0247422D" originalValue="G–I">G-I</normalizedToken>
</emphasis>
color in life. Scale bars: 2.0 mm.
</paragraph>
</caption>
<caption id="A9A141B3210F90B8A09AAE0A84051700" doi="10.3897/zookeys.877.38300.figure7" httpUri="https://binary.pensoft.net/fig/343950" pageId="0" pageNumber="1" start="Figure 7" startId="F7">
<paragraph id="5BAD4F758DF07B6B2F2302CEFF794EBD" pageId="0" pageNumber="1">
<emphasis id="608AA5D047CDFB3195CCA0565FB17468" bold="true" pageId="0" pageNumber="1">Figure 7.</emphasis>
<taxonomicName id="125AC2380779B58ACF0234D5C4D82A44" class="Malacostraca" family="Varunidae" genus="Metaplax" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Metaplax elegans" order="Decapoda" pageId="0" pageNumber="1" phylum="Arthropoda" rank="species" species="elegans">
<emphasis id="E4398C0BF7841DA8CD1247F35AF2F03C" italics="true" pageId="0" pageNumber="1">Metaplax elegans</emphasis>
</taxonomicName>
De Man, 1888 (
<emphasis id="C84D537BDFA095F4481D1B14C9CD7FC4" bold="true" pageId="0" pageNumber="1">
<normalizedToken id="D117F1E5FC1F61EB9970C6AC5F09F936" originalValue="A–D">A-D</normalizedToken>
</emphasis>
NCHUZOOL 15496, male, 12.7 mm), right G1;
<taxonomicName id="7095AD32E745CA0BF118A2AF9E5F94A0" lsidName="M. longipes" pageId="0" pageNumber="1" rank="species" species="longipes">
<emphasis id="8DB4A578846E87228B828634F8E78FF7" italics="true" pageId="0" pageNumber="1">M. longipes</emphasis>
</taxonomicName>
Stimpson, 1858 (
<emphasis id="9ABA2AA00B7F319A1115BA80A17684E8" bold="true" pageId="0" pageNumber="1">
<normalizedToken id="CDD4E30323FC3DD1543F9C7A51D91F89" originalValue="E–H">E-H</normalizedToken>
</emphasis>
ZRC 2019.0581, male, 14.9 mm), right G1;
<taxonomicName id="9FE0CB3E56AF97FFF75A9A509CB9D747" lsidName="M. sheni" pageId="0" pageNumber="1" rank="species" species="sheni">
<emphasis id="4BDDD747D9D00B7B102DAF24BF59F06C" italics="true" pageId="0" pageNumber="1">M. sheni</emphasis>
</taxonomicName>
Gordon, 1930 (
<emphasis id="CE0AC7F656B5C6F25194E61FB24B1322" bold="true" pageId="0" pageNumber="1">
<normalizedToken id="8C60FC0AB670DD50521E1A4FAA4E81DC" originalValue="I–L">I-L</normalizedToken>
</emphasis>
NCHUZOOL 15466, male, 9.9 mm), right G1; and
<taxonomicName id="AFEC190C88F8253759E27F59ABCBD569" lsidName="M. tredecim" pageId="0" pageNumber="1" rank="species" species="tredecim">
<emphasis id="21EDC2A6694A3CD9E3C8CE86A5B38AD6" italics="true" pageId="0" pageNumber="1">M. tredecim</emphasis>
</taxonomicName>
Tweedie, 1950 (
<emphasis id="91C02AD9FFA3E0CFB6AEFC82AC4A10DD" bold="true" pageId="0" pageNumber="1">
<normalizedToken id="190CDA36943EA072A3B514166D30FEA4" originalValue="M–P">M-P</normalizedToken>
</emphasis>
paratype, ZRC 1964.7.14.4-18, 16.2 mm), left G1. Scale bars: 0.5 mm (
<emphasis id="9654A7AC1189192970147C3A0C894E16" bold="true" pageId="0" pageNumber="1">
<normalizedToken id="0BB0AD8D7C4056C94EECB6FDC66070F1" originalValue="A–H">A-H</normalizedToken>
,
<normalizedToken id="46E9B8FDF2A3213FA691083A74B97B73" originalValue="M–P">M-P</normalizedToken>
</emphasis>
); 0.2 mm (
<emphasis id="C8C1A6A15920C990A7BB2BCFFFB7FC2C" bold="true" pageId="0" pageNumber="1">
<normalizedToken id="66F08792C834AFD568BA651119808643" originalValue="I–L">I-L</normalizedToken>
</emphasis>
).
</paragraph>
</caption>
</subSubSection>
</treatment>
</document>
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