treatments-xml/data/9D/37/AB/9D37AB2E611EFFFFFF43FE83DFA3FAB6.xml

<document id="EDFC3EEBADED0BC56B4C1E92AF5CEAC7" ID-CLB-Dataset="299028" ID-DOI="10.50826/bnmnszool.47.2-55" ID-GBIF-Dataset="b7740732-c563-4d41-a776-80341bbe9a6c" ID-ISSN="2434-091X" ID-Zenodo-Dep="12569673" IM.bibliography_approvedBy="carolina" IM.illustrations_approvedBy="carolina" IM.materialsCitations_approvedBy="carolina" IM.metadata_approvedBy="carolina" IM.taxonomicNames_approvedBy="carolina" IM.treatments_approvedBy="carolina" checkinTime="1718643260805" checkinUser="felipe" docAuthor="Saito, Hiroshi &amp; Aung, Mu Mu" docDate="2021" docId="9D37AB2E611EFFFFFF43FE83DFA3FAB6" docLanguage="en" docName="BullNatlMusNatSciSerA.47.2.55-63.pdf" docOrigin="Bulletin of the National Museum of Nature and Science. Series A, Zoology 47 (2)" docStyle="DocumentStyle:A6FFB80BFE6276686563735C80A89639.2:BullNatlMusNatSciSerA.2021-.journal_article.english.affilindex" docStyleId="A6FFB80BFE6276686563735C80A89639" docStyleName="BullNatlMusNatSciSerA.2021-.journal_article.english.affilindex" docStyleVersion="2" docTitle="Leptochiton myeikensis Saito &amp; Aung 2021, n. sp." docType="treatment" docVersion="4" lastPageNumber="62" masterDocId="610ED356611FFFF8FFB1FFECDE64FFF3" masterDocTitle="A New Species of Leptochiton (Mollusca: Polyplacophora) from Shallow Water of the Andaman Sea" masterLastPageNumber="63" masterPageNumber="55" pageNumber="56" updateTime="1719495891270" updateUser="ExternalLinkService" zenodo-license-document="CC-BY-4.0">
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<mods:title id="1CAA8D69B3E6ECB16573623DCC0D7EE2">A New Species of Leptochiton (Mollusca: Polyplacophora) from Shallow Water of the Andaman Sea</mods:title>
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<mods:namePart id="BDCD1ABF6567ECEB8771A84CA678BB3A">Saito, Hiroshi</mods:namePart>
<mods:affiliation id="793767298EAE2C773404A1AF6C18EEE0">Department of Zoology, National Museum of Nature and Science, 4 - 1 - 1 Amakubo, Tsukuba, Ibaraki 305 - 0005, Japan</mods:affiliation>
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<mods:namePart id="8BCFD5B0547A3B222475BC92FCC366FB">Aung, Mu Mu</mods:namePart>
<mods:affiliation id="16F897EF26D5AFF8CC5CCEB2E57B03C7">Forest Research Institute, Forest Department, Ministry of Natural Resources and Environmental Conservation, Yezin, Nay Phi Taw, Myanmar * E-mail: h-saito @ kahaku. go. jp</mods:affiliation>
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<taxonomicName id="D29E61BB611EFFF9FF43FE83DF90FE74" ID-CoL="8H9XJ" authority="Saito &amp; Aung, 2021" authorityName="Saito &amp; Aung" authorityYear="2021" box="[242,500,367,391]" class="Polyplacophora" family="Leptochitonidae" genus="Leptochiton" kingdom="Animalia" order="Lepidopleurida" pageId="1" pageNumber="56" phylum="Mollusca" rank="species" species="myeikensis" status="sp. nov.">
<emphasis id="27EAC62A611EFFF9FF43FE83DF90FE74" bold="true" box="[242,500,367,391]" italics="true" pageId="1" pageNumber="56">Leptochiton myeikensis</emphasis>
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<paragraph id="15211A38611EFFF9FEE6FE62DFB5FE55" blockId="1.[242,567,367,422]" box="[343,465,398,422]" pageId="1" pageNumber="56">
(
<figureCitation id="8DA506BD611EFFF9FEECFE62DFAFFE55" box="[349,459,398,422]" captionStart-0="Fig" captionStart-1="Fig" captionStart-2="Fig" captionStart-3="Fig" captionStart-4="Fig" captionStartId-0="2.[163,196,1550,1572]" captionStartId-1="3.[163,196,1407,1429]" captionStartId-2="4.[163,196,1584,1606]" captionStartId-3="5.[163,196,1153,1175]" captionStartId-4="6.[163,196,1542,1564]" captionTargetBox-0="[158,1217,214,1516]" captionTargetBox-1="[159,1216,215,1372]" captionTargetBox-2="[159,1216,215,1548]" captionTargetBox-3="[159,1216,215,1117]" captionTargetBox-4="[159,1216,238,1506]" captionTargetId-0="figure-68@2.[157,1218,213,1517]" captionTargetId-1="figure-103@3.[157,1218,213,1374]" captionTargetId-2="figure-48@4.[157,1218,213,1550]" captionTargetId-3="figure-256@5.[157,1218,213,1119]" captionTargetId-4="figure-12@6.[157,1218,213,1508]" captionTargetPageId-0="2" captionTargetPageId-1="3" captionTargetPageId-2="4" captionTargetPageId-3="5" captionTargetPageId-4="6" captionText-0="Fig. 1. Leptochiton myeikensis, holotype (NSMT-Mo 79255), Andaman Sea, Maung Yin Island, Myeik Islands, Myanmar, BL 4.3mm. A, B. specimen in life, dorsal and ventral views; C, D. specimen in preserved condition, ventral and lateral views (s: Schwabe organ); E. specimen in situ, underwater photograph. Scale: 1mm." captionText-1="Fig. 2. Leptochiton myeikensis, holotype (NSMT-Mo 79255), Andaman Sea, Maung Yin Island, Myeik Islands, Myanmar, BL 4.3mm. A. valve I, dorsal view; B. valve III, dorsal view; C. valve IV, frontal view; D, E. valve VIII, dorsal and lateral views; F. valve V, sculpture of lateral area; G. valve V, granules of central area, showing arrangement of aesthete pores; H. valve I, granules and arrangement of aesthete pores. Scale: 500μm for A–E; 100μm for F; 50μm for G, H." captionText-2="Fig. 3. Leptochiton myeikensis, holotype (NSMT-Mo 79255), Andaman Sea, Maung Yin Island, Myeik Islands, Myanmar, BL 4.3 mm. A. dorsal girdle scales; B. dorsal girdle scales, close up; C. dorsal needle; D. ventral girdle scales; E. ventral girdle scales near girdle margin. Scale: 20 μm for A, D, E; 10 μm for B; 50 μm for C." captionText-3="Fig. 4. Leptochiton myeikensis, holotype (NSMT-Mo 79255), Andaman Sea, Maung Yin Island, Myeik Islands, Myanmar, BL 4.3mm. A. radula, dorsal view; B. close up of left side of radula; C. close up of central part of radula; D. close up of right side of radula. Scale: 20 μm for A; 10 μm for B–D." captionText-4="Fig. 5. Leptochiton myeikensis, holotype (NSMT-Mo 79255), Andaman Sea, Maung Yin Island, Myeik Islands, Myanmar, BL 4.3mm. A. arrangement of aesthete pores in central area; B. arrangement of aesthete pores in head valve; C. dorsal scale; D. dorsal needle; E. wide marginal scale; F. narrow marginal scale; G. ventral scale near girdle margin; H. ventral scale near pallial groove; I. ventral scale in middle portion; J. radula, central three teeth and left side; K. central tooth, outline viewed from different angle, showing narrow body. Scale: 20 μm for C, E–K; 50 μm for D; A, B, schematic drawings, not to scale." figureDoi-0="http://doi.org/10.5281/zenodo.12569675" figureDoi-1="http://doi.org/10.5281/zenodo.12569679" figureDoi-2="http://doi.org/10.5281/zenodo.12569683" figureDoi-3="http://doi.org/10.5281/zenodo.12569689" figureDoi-4="http://doi.org/10.5281/zenodo.12569691" httpUri-0="https://zenodo.org/record/12569675/files/figure.png" httpUri-1="https://zenodo.org/record/12569679/files/figure.png" httpUri-2="https://zenodo.org/record/12569683/files/figure.png" httpUri-3="https://zenodo.org/record/12569689/files/figure.png" httpUri-4="https://zenodo.org/record/12569691/files/figure.png" pageId="1" pageNumber="56">Figures 1–5</figureCitation>
)
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<typeStatus id="CA25A49A611EFFF9FF16FE27DEBCFE11" box="[167,216,459,482]" pageId="1" pageNumber="56">Type</typeStatus>
locality
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. 
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, 
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, 
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, 
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, 
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, 
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.
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<typeStatus id="CA25A49A611EFFF9FF16FDDFDEBDFDB9" box="[167,217,563,586]" pageId="1" pageNumber="56">Type</typeStatus>
depository
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. 
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, 
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and 
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<collectingCounty id="FC4062B4611EFFF9FDDFFDB9DEA7FD7C" pageId="1" pageNumber="56">Tsukuba</collectingCounty>
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.
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<emphasis id="27EAC62A611EFFF9FF16FD76DF7DFD41" box="[167,281,666,690]" italics="true" pageId="1" pageNumber="56">Etymology</emphasis>
. From the name of the locality, Myeik Islands.
</paragraph>
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<emphasis id="27EAC62A611EFFF9FF16FD33DFE7FD04" box="[167,387,735,759]" italics="true" pageId="1" pageNumber="56">Material examined</emphasis>
. 
<materialsCitation id="A5F61065611EFFF9FE15FD33DF54FBFE" ID-GBIF-Occurrence="4899826301" collectingDate="2020-02-16" collectorName="H. Saito" country="Myanmar" county="southern Myeik Islands" elevation="16" latitude="10.7657" location="Andaman Sea" longLatPrecision="7" longitude="98.058" municipality="Maung Yin Island" pageId="1" pageNumber="56" specimenCount="1" typeStatus="holotype">
<typeStatus id="CA25A49A611EFFF9FE15FD33DC6FFD04" box="[420,523,735,759]" pageId="1" pageNumber="56" type="holotype">Holotype</typeStatus>
: NSMT-Mo 79255, ethanol preserved specimen, part of girdle and radula mounted on glass slides and brass stubs for SEM, body length 
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, collected from the 
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, 
<collectingMunicipality id="F5458042611EFFF9FE0EFC86DCFDFC71" box="[447,665,874,898]" pageId="1" pageNumber="56">Maung Yin Island</collectingMunicipality>
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<collectingCountry id="6D895AA8611EFFF9FE18FC61DC76FC56" box="[425,530,909,933]" name="Myanmar" pageId="1" pageNumber="56">Myanmar</collectingCountry>
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, underside of dead coral piece on coarse shell sand, by 
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with scuba, 
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<collectingDate id="7164C510611EFFF9FD33FC3EDF48FBFE" pageId="1" pageNumber="56" value="2020-02-16">16 February 2020</collectingDate>
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.
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<emphasis id="27EAC62A611EFFF9FF16FBF4DF77FBDC" box="[167,275,1048,1071]" italics="true" pageId="1" pageNumber="56">Diagnosis</emphasis>
. Animal very small. Shells moderately elevated, round-backed. Central area with longitudinal rows of semi-fused granules with wide interspaces. Each granule also connected to granules of both sides with weakly raised commarginal ridges. Girdle dorsally densely covered with small, bent, imbricating, round-topped scales which are ornamented with 12–16 sharp ribs. Radula with ca. 80 transverse rows of very small teeth; central tooth narrow, taller than first lateral teeth; head of major lateral teeth with two denticles.
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<emphasis id="27EAC62A611EFFF9FF16FA54DF41FA3C" box="[167,293,1464,1487]" italics="true" pageId="1" pageNumber="56">Description</emphasis>
. Animal very small, 
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in body length, elongate-oval. Valves moderately elevated (dorsal elevation 
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valve IV), round-backed, not beaked. Color of tegmentum and girdle light beige; soft parts reddish hue in living animal.
</paragraph>
<paragraph id="15211A38611EFFF9FF16F96BDD0CFE89" blockId="1.[140,669,458,1799]" lastBlockId="1.[707,1236,215,1799]" pageId="1" pageNumber="56">Head valve semicircular; anterior slope slightly concave. Intermediate valves rectangular, rounded in lateral margins, slightly convex in anterior margin, nearly straight in posterior margin; lateral areas not raised. Tail valve semicircular, narrower than head valve (width ratio: head valve/tail valve = 1.08); mucro central; antemucronal slope slightly convex; postmucronal slope almost straight.</paragraph>
<paragraph id="15211A38611EFFF9FD6CFE69DDF2FB4A" blockId="1.[707,1236,215,1799]" pageId="1" pageNumber="56">Tegmentum of head valve, lateral areas of intermediate valves and postmucronal area of tail valve sculptured with radial rows of small, oval, raised granules, which are semi-fused with continuous granules by low, narrow ridges; number of radial rows 55, 6–8 and 37, respectively. Central area of intermediate valves and antemucronal area of tail valve sculptured with longitudinal rows of oval, flat-topped granules, which are semi-fused with continuous granules as those on the head valve, and also connected to granules of both sides with weakly raised commarginal ridges; the number of rows 32 and 25, respectively. Aesthete pore group on each granule in central and antemucronal areas comprising one megalaesthete and 4–5 micraesthetes on each side. In head valve, lateral areas and postmucronal area, of one megalaesthete and 3-4 micraesthete pores on each side at basal portion of granules; some of frontal micraesthete pores may be obscured below the granule in dorsal view. Articulamentum thin, white. Apophyses small, triangular in intermediate valves, rectangular in tail valve, widely apart.</paragraph>
<paragraph id="15211A38611EFFFAFD6CFB29DC68F8F4" blockId="1.[707,1236,215,1799]" lastBlockId="2.[140,669,1671,1800]" lastPageId="2" lastPageNumber="57" pageId="1" pageNumber="56">
Girdle narrow, dorsally densely covered with small round-topped scales, up to 40 (length)×62 (width) 
<emphasis id="27EAC62A611EFFF9FCA4FAE7DD46FAD1" box="[789,802,1291,1314]" italics="true" pageId="1" pageNumber="56">μ</emphasis>
m, bent, imbricating, ornamented with 12–16 strong, occasionally bifurcated ribs, and scattered long needles, up to 230×12 
<emphasis id="27EAC62A611EFFF9FBC1FABCDA19FA94" box="[1136,1149,1360,1383]" italics="true" pageId="1" pageNumber="56">μ</emphasis>
m, with fine longitudinal grooves, although they may be caused by destruction during preparation for observation. Marginal fringe with two kinds of elongate scales: wider 
<typeStatus id="CA25A49A611EFFF9FC48FA36DA43FA01" box="[1017,1063,1498,1522]" pageId="1" pageNumber="56">type</typeStatus>
attaining to 80×21 
<emphasis id="27EAC62A611EFFF9FCA7FA11DD47F9E7" box="[790,803,1533,1556]" italics="true" pageId="1" pageNumber="56">μ</emphasis>
m, obtusely pointed at the top, truncated at the base, sculptured with 4–5 strong, longitudinal riblets extending from near the base to the tip; other 
<typeStatus id="CA25A49A611EFFF9FC9EF989DD39F98E" box="[815,861,1637,1661]" pageId="1" pageNumber="56">type</typeStatus>
narrower, attaining to 70×12 
<emphasis id="27EAC62A611EFFF9FB1AF989DADCF98F" box="[1195,1208,1637,1660]" italics="true" pageId="1" pageNumber="56">μ</emphasis>
m, more pointed at the tip, sculptured with 2–3 longitudinal riblets also extending to the tip. Ventrally girdle covered with scales similar to wider marginal scales, but shorter, longitudinal riblets not extending to the tip. Ventral scales becoming shorter, more roundish, and having weaker sculpture towards pallial groove; surface of those along pallial groove almost smooth.
</paragraph>
<caption id="41E14AB0611DFFFAFF12F9E2DACCF9AD" ID-DOI="http://doi.org/10.5281/zenodo.12569675" ID-Zenodo-Dep="12569675" httpUri="https://zenodo.org/record/12569675/files/figure.png" pageId="2" pageNumber="57" startId="2.[163,196,1550,1572]" targetBox="[158,1217,214,1516]" targetPageId="2" targetType="figure">
<paragraph id="15211A38611DFFFAFF12F9E2DACCF9AD" blockId="2.[163,1214,1550,1631]" pageId="2" pageNumber="57">
Fig. 1. 
<taxonomicName id="D29E61BB611DFFFAFF48F9E2DFABF9D0" authorityName="Saito &amp; Aung" authorityYear="2021" box="[249,463,1550,1571]" class="Polyplacophora" family="Leptochitonidae" genus="Leptochiton" kingdom="Animalia" order="Lepidopleurida" pageId="2" pageNumber="57" phylum="Mollusca" rank="species" species="myeikensis">
<emphasis id="27EAC62A611DFFFAFF48F9E2DFABF9D0" box="[249,463,1550,1571]" italics="true" pageId="2" pageNumber="57">Leptochiton myeikensis</emphasis>
</taxonomicName>
, holotype (NSMT-Mo 79255), Andaman Sea, Maung Yin Island, Myeik Islands, Myanmar, BL 4.3 mm. A, B. specimen in life, dorsal and ventral views; C, D. specimen in preserved condition, ventral and lateral views (s: Schwabe organ); E. specimen in situ, underwater photograph. Scale: 1 mm.
</paragraph>
</caption>
<paragraph id="15211A38611DFFFAFD6CF96BDC9FF932" blockId="2.[707,1237,1671,1799]" pageId="2" pageNumber="57">
Gills seven per side, arranged from valve 
<collectionCode id="738F82FD611DFFFAFB2DF964DADCF96C" box="[1180,1208,1672,1695]" country="Norway" name="Mykotektet, National Veterinary Institute" pageId="2" pageNumber="57">VI</collectionCode>
to anus.
</paragraph>
<paragraph id="15211A38611DFFFAFD6CF921DACBF8F4" blockId="2.[707,1237,1671,1799]" pageId="2" pageNumber="57">
Schwabe organ (
<bibRefCitation id="710F67C9611DFFFAFC3AF921DA3FF916" author="Sigwart, J. D. &amp; Sumner-Rooney, L. H. &amp; Schwabe, E. &amp; Hess, M. &amp; Brennan, G. P. &amp; Schrodl, M." box="[907,1115,1741,1765]" pageId="2" pageNumber="57" refId="ref3081" refString="Sigwart, J. D., Sumner-Rooney, L. H., Schwabe, E., Hess, M., Brennan, G. P. and Schrodl, M. 2014. A new sensory organ in lprimitivez molluscs (Mollusca: Lepidopleurida), and its context in the nervous system of chitons. Frontiers in Zoology 11: 7. http: // doi. org / 10.1186 / 1742 - 9994 - 11 - 7." type="journal volume" year="2014">
Sigwart 
<emphasis id="27EAC62A611DFFFAFC55F921DA7CF916" box="[996,1048,1741,1765]" italics="true" pageId="2" pageNumber="57">et al.</emphasis>
, 2014
</bibRefCitation>
) present on both side of oral lappets (
<figureCitation id="8DA506BD611DFFFAFC7AF903DA55F8F4" box="[971,1073,1775,1799]" captionStart="Fig" captionStartId="2.[163,196,1550,1572]" captionTargetBox="[158,1217,214,1516]" captionTargetId="figure-68@2.[157,1218,213,1517]" captionTargetPageId="2" captionText="Fig. 1. Leptochiton myeikensis, holotype (NSMT-Mo 79255), Andaman Sea, Maung Yin Island, Myeik Islands, Myanmar, BL 4.3mm. A, B. specimen in life, dorsal and ventral views; C, D. specimen in preserved condition, ventral and lateral views (s: Schwabe organ); E. specimen in situ, underwater photograph. Scale: 1mm." figureDoi="http://doi.org/10.5281/zenodo.12569675" httpUri="https://zenodo.org/record/12569675/files/figure.png" pageId="2" pageNumber="57">Fig. 1C, s</figureCitation>
), brownish.
</paragraph>
<caption id="41E14AB0611CFFFBFF12FA93DC70F9F9" ID-DOI="http://doi.org/10.5281/zenodo.12569679" ID-Zenodo-Dep="12569679" httpUri="https://zenodo.org/record/12569679/files/figure.png" pageId="3" pageNumber="58" startId="3.[163,196,1407,1429]" targetBox="[159,1216,215,1372]" targetPageId="3" targetType="figure">
<paragraph id="15211A38611CFFFBFF12FA93DC70F9F9" blockId="3.[163,1214,1407,1547]" pageId="3" pageNumber="58">
Fig. 2. 
<taxonomicName id="D29E61BB611CFFFBFF48FA93DFABFA67" authorityName="Saito &amp; Aung" authorityYear="2021" box="[249,463,1407,1428]" class="Polyplacophora" family="Leptochitonidae" genus="Leptochiton" kingdom="Animalia" order="Lepidopleurida" pageId="3" pageNumber="58" phylum="Mollusca" rank="species" species="myeikensis">
<emphasis id="27EAC62A611CFFFBFF48FA93DFABFA67" box="[249,463,1407,1428]" italics="true" pageId="3" pageNumber="58">Leptochiton myeikensis</emphasis>
</taxonomicName>
, holotype (NSMT-Mo 79255), Andaman Sea, Maung Yin Island, Myeik Islands, Myanmar, BL 4.3 mm. A. valve I, dorsal view; B. valve III, dorsal view; C. valve IV, frontal view; D, E. valve VIII, dorsal and lateral views; F. valve V, sculpture of lateral area; G. valve V, granules of central area, showing arrangement of aesthete pores; H. valve I, granules and arrangement of aesthete pores. Scale: 500 
<emphasis id="27EAC62A611CFFFBFBCEFA34DAEEFA1E" box="[1151,1162,1496,1517]" italics="true" pageId="3" pageNumber="58">μ</emphasis>
m for A–E; 100 
<emphasis id="27EAC62A611CFFFBFE9BFA19DF51F9F9" box="[298,309,1525,1546]" italics="true" pageId="3" pageNumber="58">μ</emphasis>
m for F; 50 
<emphasis id="27EAC62A611CFFFBFE2EFA19DFCEF9F9" box="[415,426,1525,1546]" italics="true" pageId="3" pageNumber="58">μ</emphasis>
m for G, H.
</paragraph>
</caption>
<paragraph id="15211A38611CFFFCFF16F9AEDC75F916" blockId="3.[140,669,1602,1799]" lastBlockId="4.[140,669,1706,1765]" lastPageId="4" lastPageNumber="59" pageId="3" pageNumber="58">
Radula 
<quantity id="D266B7DD611CFFFBFF4CF9AEDF2FF9AA" box="[253,331,1602,1626]" metricMagnitude="-3" metricUnit="m" metricValue="1.3" pageId="3" pageNumber="58" unit="mm" value="1.3">1.3 mm</quantity>
long with 80 transverse rows of very small mature teeth. Central tooth narrow, with small blade at top, keeled, widened at basal half. First lateral teeth longer than central tooth, bearing small cusp at top. Major lateral teeth with bidentate cusp; inner denticle much smaller than outer main one; shaft plate-like with folded part at proximal portion and fin-like process in outer-basal portion; fin-like process with small notch at distal portion. Major uncinal teeth rather wide, with folded blade in distal half. Inner marginal teeth small, roughly u-shape, holding base of major uncinal tooth. Outer marginal teeth wide, obtusely pointed at both sides.
</paragraph>
<caption id="41E14AB0611BFFFCFF12F9DCDACAF973" ID-DOI="http://doi.org/10.5281/zenodo.12569683" ID-Zenodo-Dep="12569683" httpUri="https://zenodo.org/record/12569683/files/figure.png" pageId="4" pageNumber="59" startId="4.[163,196,1584,1606]" targetBox="[159,1216,215,1548]" targetPageId="4" targetType="figure">
<paragraph id="15211A38611BFFFCFF12F9DCDACAF973" blockId="4.[163,1214,1584,1664]" pageId="4" pageNumber="59">
Fig. 3. 
<taxonomicName id="D29E61BB611BFFFCFF48F9DCDFABF9B6" authorityName="Saito &amp; Aung" authorityYear="2021" box="[249,463,1584,1605]" class="Polyplacophora" family="Leptochitonidae" genus="Leptochiton" kingdom="Animalia" order="Lepidopleurida" pageId="4" pageNumber="59" phylum="Mollusca" rank="species" species="myeikensis">
<emphasis id="27EAC62A611BFFFCFF48F9DCDFABF9B6" box="[249,463,1584,1605]" italics="true" pageId="4" pageNumber="59">Leptochiton myeikensis</emphasis>
</taxonomicName>
, holotype (NSMT-Mo 79255), Andaman Sea, Maung Yin Island, Myeik Islands, Myanmar, BL 4.3 mm. A. dorsal girdle scales; B. dorsal girdle scales, close up; C. dorsal needle; D. ventral girdle scales; E. ventral girdle scales near girdle margin. Scale: 20 
<emphasis id="27EAC62A611BFFFCFC9DF987DD53F973" box="[812,823,1643,1664]" italics="true" pageId="4" pageNumber="59">μ</emphasis>
m for A, D, E; 10 
<emphasis id="27EAC62A611BFFFCFC6AF987DD82F973" box="[987,998,1643,1664]" italics="true" pageId="4" pageNumber="59">μ</emphasis>
m for B; 50 
<emphasis id="27EAC62A611BFFFCFBE7F987DA05F973" box="[1110,1121,1643,1664]" italics="true" pageId="4" pageNumber="59">μ</emphasis>
m for C.
</paragraph>
</caption>
<paragraph id="15211A38611BFFFCFD6CF946DAB5F931" blockId="4.[707,1236,1706,1799]" box="[733,1233,1706,1730]" pageId="4" pageNumber="59">
<emphasis id="27EAC62A611BFFFCFD6CF946DD3BF931" box="[733,863,1706,1730]" italics="true" pageId="4" pageNumber="59">Distribution</emphasis>
. Only known from 
<typeStatus id="CA25A49A611BFFFCFBF6F946DA11F931" box="[1095,1141,1706,1730]" pageId="4" pageNumber="59">type</typeStatus>
locality.
</paragraph>
<paragraph id="15211A38611BFFFFFD6CF921DC7AFE6E" blockId="4.[707,1236,1706,1799]" lastBlockId="7.[140,670,215,1349]" lastPageId="7" lastPageNumber="62" pageId="4" pageNumber="59">
<emphasis id="27EAC62A611BFFFCFD6CF921DD5EF916" box="[733,826,1741,1765]" italics="true" pageId="4" pageNumber="59">Remarks</emphasis>
. The present new species is characterized by longitudinal rows of granules on the central area of the intermediate valves and on the antemucronal area of the tail valve, 9–11 aesthetes in each granule, wide, round-topped dorsal scales with 12–16 riblets, a high number of transverse rows of radula teeth (80 rows), narrow central tooth of the radula and bidentate cusps of the major lateral teeth, with the inner denticle being distinctly shorter than the outer one. Sirenko (2020) recognized five species groups defined by the condition of the characters mentioned above (arrangement of granules, number of aesthete pores, shape and sculpture of dorsal girdle scales, number of transverse rows of radula, and shape of central tooth and the head of major lateral teeth). He assigned 47 species into those five groups. The present species does not match any of those five groups. Among approximately ninety remaining species in this genus, the present species most resembles 
<taxonomicName id="D29E61BB611AFFFDFBABFA9EDDD1FA5F" authority="Sirenko, 2015" authorityName="Sirenko" authorityYear="2015" class="Polyplacophora" family="Leptochitonidae" genus="Leptochiton" kingdom="Animalia" order="Lepidopleurida" pageId="5" pageNumber="60" phylum="Mollusca" rank="species" species="lascrusesi">
<emphasis id="27EAC62A611AFFFDFBABFA9EDD6BFA5F" italics="true" pageId="5" pageNumber="60">Leptochiton lascrusesi</emphasis>
<bibRefCitation id="710F67C9611AFFFDFCABFA79DDD1FA5F" author="Sirenko, B. I." box="[794,949,1428,1453]" pageId="5" pageNumber="60" pagination="151 - 202" refId="ref3198" refString="Sirenko, B. I. 2015. Shallow and deep-sea chitons of the genus Leptochiton Gray, 1847 (Mollusca: Polyplacophora: Lepidopleurida) from Peruvian and Chilean waters. Zootaxa 4033: 151 - 202. http: // dx. doi. org / 10. 11646 / Zootaxa. 4033.2.1." type="journal article" year="2015">Sirenko, 2015</bibRefCitation>
</taxonomicName>
described from intertidal zone of Las Cruses, 
<collectingCountry id="6D895AA8611AFFFDFC1BFA5BDD82FA3C" box="[938,998,1463,1487]" name="Chile" pageId="5" pageNumber="60">Chile</collectingCountry>
, 
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, 
<geoCoordinate id="70AA7CFF611AFFFDFBE8FA5BDAD5FA3C" box="[1113,1201,1462,1487]" degrees="71" direction="east" minutes="37" orientation="longitude" pageId="5" pageNumber="60" precision="925" value="71.61667">71°37′E</geoCoordinate>
, in having longitudinal rows of granules in central and antemucronal areas, wide, round-topped dorsal scales with distinct riblets, high number of transverse rows of the radula teeth. However, the present new species differs from the latter in having round-backed valves (carinate in 
<taxonomicName id="D29E61BB611AFFFDFB34F964DD6BF931" authorityName="Sirenko" authorityYear="2015" class="Polyplacophora" family="Leptochitonidae" genus="Leptochiton" kingdom="Animalia" order="Lepidopleurida" pageId="5" pageNumber="60" phylum="Mollusca" rank="species" species="lascrusesi">
<emphasis id="27EAC62A611AFFFDFB34F964DD6BF931" italics="true" pageId="5" pageNumber="60">L. lascrusesi</emphasis>
</taxonomicName>
), radial rows of granules on the head valve, lateral area of the intermediate valves and the antemucronal area of the tail valve (quincunx arrangement in 
<taxonomicName id="D29E61BB6118FFFFFEFCFF34DF85FF1C" authorityName="Sirenko" authorityYear="2015" box="[333,481,215,239]" class="Polyplacophora" family="Leptochitonidae" genus="Leptochiton" kingdom="Animalia" order="Lepidopleurida" pageId="7" pageNumber="62" phylum="Mollusca" rank="species" species="lascrusesi">
<emphasis id="27EAC62A6118FFFFFEFCFF34DF85FF1C" box="[333,481,215,239]" italics="true" pageId="7" pageNumber="62">L. lascrusesi</emphasis>
</taxonomicName>
), 9-11 aesthete pores on each granule (
<quantity id="D266B7DD6118FFFFFE3AFF16DFD2FEE1" box="[395,438,250,274]" metricMagnitude="-2" metricUnit="m" metricValue="7.62" pageId="7" pageNumber="62" unit="in" value="3.0">3 in</quantity>
<taxonomicName id="D29E61BB6118FFFFFE0FFF17DC23FEE1" authorityName="Sirenko" authorityYear="2015" box="[446,583,250,274]" class="Polyplacophora" family="Leptochitonidae" genus="Leptochiton" kingdom="Animalia" order="Lepidopleurida" pageId="7" pageNumber="62" phylum="Mollusca" rank="species" species="lascrusesi">
<emphasis id="27EAC62A6118FFFFFE0FFF17DC23FEE1" box="[446,583,250,274]" italics="true" pageId="7" pageNumber="62">L. lascrusesi</emphasis>
</taxonomicName>
), 12-16 riblets on the dorsal girdle scale (
<quantity id="D266B7DD6118FFFFFE44FEF1DC34FEC6" box="[501,592,285,309]" metricMagnitude="-1" metricUnit="m" metricValue="2.794" metricValueMax="3.048" metricValueMin="2.54" pageId="7" pageNumber="62" unit="in" value="11.0" valueMax="12.0" valueMin="10.0">10-12 in</quantity>
<taxonomicName id="D29E61BB6118FFFFFDE9FEF1DEBCFEA4" authorityName="Sirenko" authorityYear="2015" class="Polyplacophora" family="Leptochitonidae" genus="Leptochiton" kingdom="Animalia" order="Lepidopleurida" pageId="7" pageNumber="62" phylum="Mollusca" rank="species" species="lascrusesi">
<emphasis id="27EAC62A6118FFFFFDE9FEF1DEBCFEA4" italics="true" pageId="7" pageNumber="62">L. lascrusesi</emphasis>
</taxonomicName>
), 80 rows of the radula teeth (
<quantity id="D266B7DD6118FFFFFD85FED3DC19FEA4" box="[564,637,319,343]" metricMagnitude="0" metricUnit="m" metricValue="3.048" pageId="7" pageNumber="62" unit="in" value="120.0">120 in</quantity>
<taxonomicName id="D29E61BB6118FFFFFD36FEACDE93FE89" authorityName="Sirenko" authorityYear="2015" class="Polyplacophora" family="Leptochitonidae" genus="Leptochiton" kingdom="Animalia" order="Lepidopleurida" pageId="7" pageNumber="62" phylum="Mollusca" rank="species" species="lascrusesi">
<emphasis id="27EAC62A6118FFFFFD36FEACDE93FE89" italics="true" pageId="7" pageNumber="62">L. lascrusesi</emphasis>
</taxonomicName>
), and bicuspid head of the major lateral teeth (unicuspid in 
<taxonomicName id="D29E61BB6118FFFFFE39FE69DC6BFE6E" authorityName="Sirenko" authorityYear="2015" box="[392,527,389,413]" class="Polyplacophora" family="Leptochitonidae" genus="Leptochiton" kingdom="Animalia" order="Lepidopleurida" pageId="7" pageNumber="62" phylum="Mollusca" rank="species" species="lascrusesi">
<emphasis id="27EAC62A6118FFFFFE39FE69DC6BFE6E" box="[392,527,389,413]" italics="true" pageId="7" pageNumber="62">L. lascrusesi</emphasis>
</taxonomicName>
).
</paragraph>
<caption id="41E14AB0611AFFFDFF12FB6DDDFCFB22" ID-DOI="http://doi.org/10.5281/zenodo.12569689" ID-Zenodo-Dep="12569689" httpUri="https://zenodo.org/record/12569689/files/figure.png" pageId="5" pageNumber="60" startId="5.[163,196,1153,1175]" targetBox="[159,1216,215,1117]" targetPageId="5" targetType="figure">
<paragraph id="15211A38611AFFFDFF12FB6DDDFCFB22" blockId="5.[163,1214,1153,1233]" pageId="5" pageNumber="60">
Fig. 4. 
<taxonomicName id="D29E61BB611AFFFDFF48FB6DDFABFB65" authorityName="Saito &amp; Aung" authorityYear="2021" box="[249,463,1153,1174]" class="Polyplacophora" family="Leptochitonidae" genus="Leptochiton" kingdom="Animalia" order="Lepidopleurida" pageId="5" pageNumber="60" phylum="Mollusca" rank="species" species="myeikensis">
<emphasis id="27EAC62A611AFFFDFF48FB6DDFABFB65" box="[249,463,1153,1174]" italics="true" pageId="5" pageNumber="60">Leptochiton myeikensis</emphasis>
</taxonomicName>
, holotype (NSMT-Mo 79255), Andaman Sea, Maung Yin Island, Myeik Islands, Myanmar, BL 4.3 mm. A. radula, dorsal view; B. close up of left side of radula; C. close up of central part of radula; D. close up of right side of radula. Scale: 20 
<emphasis id="27EAC62A611AFFFDFD1BFB50DCD1FB22" box="[682,693,1212,1233]" italics="true" pageId="5" pageNumber="60">μ</emphasis>
m for A; 10 
<emphasis id="27EAC62A611AFFFDFC95FB50DD4BFB22" box="[804,815,1212,1233]" italics="true" pageId="5" pageNumber="60">μ</emphasis>
m for B–D.
</paragraph>
</caption>
<caption id="41E14AB06119FFFEFF12F9EADDFDF95D" ID-DOI="http://doi.org/10.5281/zenodo.12569691" ID-Zenodo-Dep="12569691" httpUri="https://zenodo.org/record/12569691/files/figure.png" pageId="6" pageNumber="61" startId="6.[163,196,1542,1564]" targetBox="[159,1216,238,1506]" targetPageId="6" targetType="figure">
<paragraph id="15211A386119FFFEFF12F9EADDFDF95D" blockId="6.[163,1215,1541,1710]" pageId="6" pageNumber="61">
Fig. 5. 
<taxonomicName id="D29E61BB6119FFFEFF48F9EADFABF9E8" authorityName="Saito &amp; Aung" authorityYear="2021" box="[249,463,1542,1563]" class="Polyplacophora" family="Leptochitonidae" genus="Leptochiton" kingdom="Animalia" order="Lepidopleurida" pageId="6" pageNumber="61" phylum="Mollusca" rank="species" species="myeikensis">
<emphasis id="27EAC62A6119FFFEFF48F9EADFABF9E8" box="[249,463,1542,1563]" italics="true" pageId="6" pageNumber="61">Leptochiton myeikensis</emphasis>
</taxonomicName>
, holotype (NSMT-Mo 79255), Andaman Sea, Maung Yin Island, Myeik Islands, Myanmar, BL 4.3 mm. A. arrangement of aesthete pores in central area; B. arrangement of aesthete pores in head valve; C. dorsal scale; D. dorsal needle; E. wide marginal scale; F. narrow marginal scale; G. ventral scale near girdle margin; H. ventral scale near pallial groove; I. ventral scale in middle portion; J. radula, central three teeth and left side; K. central tooth, outline viewed from different angle, showing narrow body. Scale: 20 
<emphasis id="27EAC62A6119FFFEFE98F975DF50F95D" box="[297,308,1689,1710]" italics="true" pageId="6" pageNumber="61">μ</emphasis>
m for C, E–K; 50 
<emphasis id="27EAC62A6119FFFEFE69F975DF87F95D" box="[472,483,1689,1710]" italics="true" pageId="6" pageNumber="61">μ</emphasis>
m for D; A, B, schematic drawings, not to scale.
</paragraph>
</caption>
<paragraph id="15211A386118FFFFFF16FE4BDFA3FAB6" blockId="7.[140,670,215,1349]" pageId="7" pageNumber="62">
The present new species is easily distinguishable from the other four species known in this genus from tropical and subtropical shallow waters: 
<taxonomicName id="D29E61BB6118FFFFFF59FDE3DCF9FDD4" authority="(Leloup, 1981)" baseAuthorityName="Leloup" baseAuthorityYear="1981" box="[232,669,527,551]" class="Polyplacophora" family="Leptochitonidae" genus="Leptochiton" kingdom="Animalia" order="Lepidopleurida" pageId="7" pageNumber="62" phylum="Mollusca" rank="species" species="nierstraszi">
<emphasis id="27EAC62A6118FFFFFF59FDE3DF83FDD4" box="[232,487,527,551]" italics="true" pageId="7" pageNumber="62">Leptochiton nierstraszi</emphasis>
(
<bibRefCitation id="710F67C96118FFFFFE4DFDE3DCF1FDD4" author="Leloup, E." box="[508,661,527,551]" pageId="7" pageNumber="62" pagination="1 - 46" refId="ref2865" refString="Leloup, E. 1981. Chitons de Tulear, Reunion, Maurice et Tahiti. Bulletin de l`Institut royal des Sciences naturelles de Belgique 53: 1 - 46." type="journal article" year="1981">Leloup, 1981</bibRefCitation>
)
</taxonomicName>
described from 
<collectingCountry id="6D895AA86118FFFFFEFFFDDEDFABFDB9" box="[334,463,562,586]" name="Madagascar" pageId="7" pageNumber="62">Madagascar</collectingCountry>
has a quincunx arrangement of the granules on the shell, and unicuspid head of the major lateral teeth of the radula; 
<taxonomicName id="D29E61BB6118FFFFFF5BFD76DCF9FD41" authority="Schwabe, 2006" authorityName="Schwabe" authorityYear="2006" box="[234,669,666,690]" class="Polyplacophora" family="Leptochitonidae" genus="Leptochiton" kingdom="Animalia" order="Lepidopleurida" pageId="7" pageNumber="62" phylum="Mollusca" rank="species" species="hiriensis">
<emphasis id="27EAC62A6118FFFFFF5BFD76DFBDFD41" box="[234,473,666,690]" italics="true" pageId="7" pageNumber="62">Leptochiton hiriensis</emphasis>
Schwabe, 2006
</taxonomicName>
from Rapa, Polynesia has prominent commarginal ridges, broader, rectangular central tooth of the radula and tricuspid head of the major lateral teeth. 
<taxonomicName id="D29E61BB6118FFFFFF59FCC9DF50FCAC" authority="Sirenko and Schwabe, 2011" authorityName="Sirenko and Schwabe" authorityYear="2011" class="Polyplacophora" family="Leptochitonidae" genus="Leptochiton" kingdom="Animalia" order="Lepidopleurida" pageId="7" pageNumber="62" phylum="Mollusca" rank="species" species="muelleri">
<emphasis id="27EAC62A6118FFFFFF59FCC9DF85FCCE" box="[232,481,805,829]" italics="true" pageId="7" pageNumber="62">Leptochiton muelleri</emphasis>
Sirenko and Schwabe, 2011
</taxonomicName>
described from 
<collectingCountry id="6D895AA86118FFFFFE45FCABDC01FCAC" box="[500,613,839,863]" name="Sri Lanka" pageId="7" pageNumber="62">Sri Lanka</collectingCountry>
, and reported from 
<collectingCountry id="6D895AA86118FFFFFEF0FC86DFFFFC71" box="[321,411,874,898]" name="Vietnam" pageId="7" pageNumber="62">Vietnam</collectingCountry>
(
<bibRefCitation id="710F67C96118FFFFFE06FC86DC3AFC71" author="Sirenko, B. I." box="[439,606,874,898]" pageId="7" pageNumber="62" pagination="65 - 73" refId="ref3165" refString="Sirenko, B. I. 2014. New findings of minute chiton of the genus Leptochiton (Mollusca, Polyplacophora) in Vietnamese waters. Ruthenica 24: 65 - 73." type="journal article" year="2014">Sirenko, 2014</bibRefCitation>
) has higher valves, quincunx arrangement of the granules on the head valve, lateral and antemucronal areas, five aesthete pores on each granule, fewer number of transverse rows of the radula teeth (42 rows of mature teeth in the 
<typeStatus id="CA25A49A6118FFFFFE07FBFBDC7CFBDC" box="[438,536,1047,1071]" pageId="7" pageNumber="62" type="holotype">holotype</typeStatus>
), and tricuspid head of the major lateral teeth; 
<taxonomicName id="D29E61BB6118FFFFFDAFFBD6DC6DFB86" authority="Sirenko and Saito, 2020" authorityName="Sirenko and Saito" authorityYear="2020" class="Polyplacophora" family="Leptochitonidae" genus="Leptochiton" kingdom="Animalia" order="Lepidopleurida" pageId="7" pageNumber="62" phylum="Mollusca" rank="species" species="pumilus">
<emphasis id="27EAC62A6118FFFFFDAFFBD6DE84FB86" italics="true" pageId="7" pageNumber="62">Leptochiton pumilus</emphasis>
Sirenko and Saito, 2020
</taxonomicName>
from 
<collectingCountry id="6D895AA86118FFFFFDEDFBB1DF76FB64" name="Papua New Guinea" pageId="7" pageNumber="62">Papua New Guinea</collectingCountry>
and the 
<collectingCountry id="6D895AA86118FFFFFEDFFB93DF82FB64" box="[366,486,1151,1175]" name="Philippines" pageId="7" pageNumber="62">Philippines</collectingCountry>
has much higher valves with grid-like sculpture on the central and antemucronal areas, five aesthete pores on each granule, flat ventral scales, and fewer number of transverse rows of the radula teeth (31 rows of mature teeth in the 
<typeStatus id="CA25A49A6118FFFFFEEBFAC1DFD8FAB6" box="[346,444,1325,1349]" pageId="7" pageNumber="62" type="holotype">holotype</typeStatus>
).
</paragraph>
</subSubSection>
</treatment>
</document>