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<document id="8ED6C723DF6AB3BA568162D02E8C0686" ID-DOI="10.5281/zenodo.13244740" ID-ISSN="2345-7600" ID-Zenodo-Dep="13244740" IM.bibliography_approvedBy="felipe" IM.illustrations_approvedBy="felipe" IM.materialsCitations_approvedBy="felipe" IM.metadata_approvedBy="felipe" IM.taxonomicNames_approvedBy="felipe" IM.treatmentCitations_approvedBy="felipe" IM.treatments_approvedBy="felipe" checkinTime="1722970161043" checkinUser="felipe" docAuthor="Lam, Katherine &amp; Morton, Brian" docDate="2004" docId="F01A87829300F60FFCB351D3B38AFE4C" docLanguage="en" docName="RafflesBZool.52.1.11-28.pdf" docOrigin="Raffles Bulletin of Zoology 52 (1)" docStyle="DocumentStyle:19380AF0FBA5B2F218DD253A34ABE57F.5:RafflesBZool.2003-2005.journal_article" docStyleId="19380AF0FBA5B2F218DD253A34ABE57F" docStyleName="RafflesBZool.2003-2005.journal_article" docStyleVersion="5" docTitle="Crassostrea ariakensis Fujita 1913" docType="treatment" docVersion="3" lastPageNumber="19" masterDocId="0C23FFFA9307F607FFFB526EB07AFFAC" masterDocTitle="The Oysters Of Hong Kong (Bivalvia: Ostreidae And Gryphaeidae)" masterLastPageNumber="28" masterPageNumber="11" pageNumber="18" updateTime="1722975523410" updateUser="ExternalLinkService" zenodo-license-document="CC-BY-4.0">
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<mods:title id="B4CBE3BEA30B4389E695A90855337F18">The Oysters Of Hong Kong (Bivalvia: Ostreidae And Gryphaeidae)</mods:title>
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<mods:namePart id="1B0980C3F589718BB5F086F6EC7E3750">Lam, Katherine</mods:namePart>
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<mods:namePart id="324C3A53CDBC1958F74CE942AEA4081E">Morton, Brian</mods:namePart>
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<mods:title id="66A52A5050B66AC52EF87EFFB8E137EC">Raffles Bulletin of Zoology</mods:title>
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<mods:date id="27602C2873EFB44A24782E4DA95B0D16">2004</mods:date>
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<treatment id="F01A87829300F60FFCB351D3B38AFE4C" ID-DOI="http://doi.org/10.5281/zenodo.13244873" ID-Zenodo-Dep="13244873" LSID="urn:lsid:plazi:treatment:F01A87829300F60FFCB351D3B38AFE4C" httpUri="http://treatment.plazi.org/id/F01A87829300F60FFCB351D3B38AFE4C" lastPageId="8" lastPageNumber="19" pageId="7" pageNumber="18">
<subSubSection id="30A9651F9300F600FCB351D3B4CBFB99" pageId="7" pageNumber="18" type="nomenclature">
<paragraph id="780C36949300F600FCB351D3B5EAFC79" blockId="7.[840,1424,957,981]" box="[840,1424,957,981]" pageId="7" pageNumber="18">
<heading id="234481F89300F600FCB351D3B5EAFC79" bold="true" box="[840,1424,957,981]" centered="true" fontSize="10" level="2" pageId="7" pageNumber="18" reason="2">
<emphasis id="4AC7EA869300F600FCB351D3B5EAFC79" bold="true" box="[840,1424,957,981]" pageId="7" pageNumber="18">
<taxonomicName id="BFB34D179300F600FCB351D3B4A2FC79" ID-CoL="Z6YW" authority="Fujita, 1913" authorityName="Fujita" authorityYear="1913" box="[840,1240,957,981]" class="Bivalvia" family="Ostreidae" genus="Crassostrea" kingdom="Animalia" order="Ostreida" pageId="7" pageNumber="18" phylum="Mollusca" rank="species" species="ariakensis">
<emphasis id="4AC7EA869300F600FCB351D3B43EFC79" bold="true" box="[840,1092,957,981]" italics="true" pageId="7" pageNumber="18">Crassostrea ariakensis</emphasis>
Fujita, 1913
</taxonomicName>
,
<emphasis id="4AC7EA869300F600FB1E51D3B484FC79" bold="true" box="[1253,1278,957,981]" italics="true" pageId="7" pageNumber="18">ex</emphasis>
Wakiya MS
</emphasis>
</heading>
</paragraph>
<paragraph id="780C36949300F600FC465190B4CBFB99" blockId="7.[957,1308,1022,1077]" pageId="7" pageNumber="18">
Common name: Suminoe oyster (
<figureCitation id="E0882A119300F600FBD45670B400FB99" box="[1071,1146,1054,1077]" captionStart="Fig" captionStartId="8.[136,172,2034,2055]" captionTargetBox="[136,1476,543,1994]" captionTargetId="figure-222@8.[136,1477,543,1995]" captionTargetPageId="8" captionText="Fig. 4. Crassostrea, Saccostrea and Planostrea from Hong Kong showing external and internal views of the right valves and the internal views of the left valves. A-C. C. ariakensis (NHM 20030470). D-F. S. cucullata (NHM 20030496). G-I. S. mordax (NHM 20030492). J- L. P. pestigris (SBMNH 345716). Scale bar = 20 mm." figureDoi="http://doi.org/10.5281/zenodo.13244748" httpUri="https://zenodo.org/record/13244748/files/figure.png" pageId="7" pageNumber="18">Figs. 4</figureCitation>
A-C)
</paragraph>
</subSubSection>
<subSubSection id="30A9651F9300F600FCD65633B46EFB49" pageId="7" pageNumber="18" type="reference_group">
<paragraph id="780C36949300F600FCD65633B53FFBDE" blockId="7.[813,1453,1117,1253]" box="[813,1349,1117,1138]" pageId="7" pageNumber="18">
<treatmentCitationGroup id="58A311BA9300F600FCD65633B53FFBDE" box="[813,1349,1117,1138]" pageId="7" pageNumber="18">
<treatmentCitation id="F91210859300F600FCD65633B4EBFBDE" author="Lischke, C" box="[813,1169,1117,1138]" page="176" pageId="7" pageNumber="18" year="1869">
<taxonomicName id="BFB34D179300F600FCD65633B4EBFBDE" authority="Lischke, 1869: 176" authorityName="Lischke" authorityPageNumber="176" authorityYear="1869" box="[813,1169,1117,1138]" class="Bivalvia" family="Ostreidae" genus="Ostrea" kingdom="Animalia" order="Ostreida" pageId="7" pageNumber="18" phylum="Mollusca" rank="species" species="rivularis">
<emphasis id="4AC7EA869300F600FCD65633B3B0FBDE" box="[813,970,1117,1138]" italics="true" pageId="7" pageNumber="18">Ostrea rivularis</emphasis>
<bibRefCitation id="1C224B659300F600FC2A5633B4EBFBDE" author="Lischke, C" box="[977,1169,1117,1138]" pageId="7" pageNumber="18" refId="ref13419" refString="Lischke, C. E., 1869. Japanische Meeres-Conchylien. Ein Beitrage zur kenntniss der Mollusken Japan's, mit besonderer Rucksicht auf die Geographische Verbreitung Derselben. Theodor Fischer, Cassel." type="book" year="1869">Lischke, 1869: 176</bibRefCitation>
</taxonomicName>
</treatmentCitation>
, Pl. 14,
<figureCitation id="E0882A119300F600FB185633B552FBDE" box="[1251,1320,1117,1138]" captionStart="Fig" captionStartId="2.[136,171,1976,1997]" captionTargetBox="[445,1175,924,1938]" captionTargetId="figure-370@2.[394,1234,879,1983]" captionTargetPageId="2" captionText="Fig. 2. Neighbour-joining tree based on Kimura 2-parameter distances with 1000 bootstraps using COI mtDNA partial sequences (~618 nt) of Crassostrea. The bootstrap percentages supporting each node of the neighbour-joining and most parsimonious trees are indicated above and below the branches, respectively.Only values&gt;70 are shown.The scale represents percentage substitutions.Ostrea chilensis is employed as outgroups. YSO1 to 6, HHW1 to 6 and TT1 to 3 are samples collected from Yung Shue O, Hoi Ha Wan and Tai Tam, Hong Kong, respectively." figureDoi="http://doi.org/10.5281/zenodo.13244744" httpUri="https://zenodo.org/record/13244744/files/figure.png" pageId="7" pageNumber="18">Figs. 2</figureCitation>
,
<figureCitation id="E0882A119300F600FAC85633B53BFBDE" box="[1331,1345,1117,1138]" captionStart="Fig" captionStartId="6.[136,172,2065,2086]" captionTargetBox="[136,1476,554,1990]" captionTargetId="figure-219@6.[136,1478,554,1990]" captionTargetPageId="6" captionText="Fig. 3. Crassostrea from Hong Kong showing external and internal views of the right valves and the internal views of the left valves. A- C. C. lugubris (NHM 20030490). D-F. C. angulata (NHM 20030491). G-I. C. hongkongensis (NHM 20020501). Scale bars = 20 mm." figureDoi="http://doi.org/10.5281/zenodo.13244746" httpUri="https://zenodo.org/record/13244746/files/figure.png" pageId="7" pageNumber="18">3</figureCitation>
.
</treatmentCitationGroup>
</paragraph>
<paragraph id="780C36949300F600FCD65614B435FB00" blockId="7.[813,1453,1117,1253]" pageId="7" pageNumber="18">
<treatmentCitationGroup id="58A311BA9300F600FCD65614B435FB00" pageId="7" pageNumber="18">
<taxonomicName id="BFB34D179300F600FCD65614B405FB23" ID-CoL="6TCSY" authority="Fujita, 1913: 519" authorityName="Fujita" authorityPageNumber="519" authorityYear="1913" box="[813,1151,1146,1167]" class="Bivalvia" family="Ostreidae" genus="Ostrea" kingdom="Animalia" order="Ostreida" pageId="7" pageNumber="18" phylum="Mollusca" rank="species" species="ariakensis">
<emphasis id="4AC7EA869300F600FCD65614B3ACFB23" box="[813,982,1146,1167]" italics="true" pageId="7" pageNumber="18">Ostrea ariakensis</emphasis>
Fujita, 1913: 519
</taxonomicName>
,
<emphasis id="4AC7EA869300F600FB735614B4E7FB23" box="[1160,1181,1146,1167]" italics="true" pageId="7" pageNumber="18">ex</emphasis>
Wakiya MS;
<treatmentCitation id="F91210859300F600FAE45614B3DCFB00" author="Wakiya, Y" page="363" pageId="7" pageNumber="18" year="1929">
<bibRefCitation id="1C224B659300F600FAE45614B3DCFB00" author="Wakiya, Y" pageId="7" pageNumber="18" pagination="359 - 367" refId="ref14761" refString="Wakiya, Y., 1929. Japanese food oysters. Japanese Journal of Zoology, 2: 359 - 367." type="journal article" year="1929">Wakiya, 1929: 363-364</bibRefCitation>
</treatmentCitation>
, Pl. 9,
<figureCitation id="E0882A119300F600FC1756F9B455FB00" box="[1004,1071,1175,1196]" captionStart="Fig" captionStartId="1.[113,149,2094,2115]" captionTargetBox="[124,1441,1062,2021]" captionTargetId="figure-399@1.[92,1481,1035,2058]" captionTargetPageId="1" captionText="Fig. 1. A map of Hong Kong showing the locations where oysters were collected." figureDoi="http://doi.org/10.5281/zenodo.13244742" httpUri="https://zenodo.org/record/13244742/files/figure.png" pageId="7" pageNumber="18">Figs. 1</figureCitation>
,
<figureCitation id="E0882A119300F600FBC656F9B436FB00" box="[1085,1100,1175,1196]" captionStart="Fig" captionStartId="2.[136,171,1976,1997]" captionTargetBox="[445,1175,924,1938]" captionTargetId="figure-370@2.[394,1234,879,1983]" captionTargetPageId="2" captionText="Fig. 2. Neighbour-joining tree based on Kimura 2-parameter distances with 1000 bootstraps using COI mtDNA partial sequences (~618 nt) of Crassostrea. The bootstrap percentages supporting each node of the neighbour-joining and most parsimonious trees are indicated above and below the branches, respectively.Only values&gt;70 are shown.The scale represents percentage substitutions.Ostrea chilensis is employed as outgroups. YSO1 to 6, HHW1 to 6 and TT1 to 3 are samples collected from Yung Shue O, Hoi Ha Wan and Tai Tam, Hong Kong, respectively." figureDoi="http://doi.org/10.5281/zenodo.13244744" httpUri="https://zenodo.org/record/13244744/files/figure.png" pageId="7" pageNumber="18">2</figureCitation>
.
</treatmentCitationGroup>
</paragraph>
<paragraph id="780C36949300F600FCD656DAB46EFB49" blockId="7.[813,1453,1117,1253]" pageId="7" pageNumber="18">
<treatmentCitationGroup id="58A311BA9300F600FCD656DAB46EFB49" pageId="7" pageNumber="18">
<emphasis id="4AC7EA869300F600FCD656DAB464FB65" box="[813,1054,1204,1225]" italics="true" pageId="7" pageNumber="18">
<taxonomicName id="BFB34D179300F600FCD656DAB474FB65" ID-CoL="Z6YW" authorityName="Fujita" authorityYear="1913" box="[813,1038,1204,1225]" class="Bivalvia" family="Ostreidae" genus="Crassostrea" kingdom="Animalia" order="Ostreida" pageId="7" pageNumber="18" phylum="Mollusca" rank="species" species="ariakensis">Crassostrea ariakensis</taxonomicName>
-
</emphasis>
<treatmentCitation id="F91210859300F600FBDD56DAB49CFB65" author="Torigoe, K" box="[1062,1254,1204,1225]" page="377" pageId="7" pageNumber="18" year="1981">
<bibRefCitation id="1C224B659300F600FBDD56DAB49CFB65" author="Torigoe, K" box="[1062,1254,1204,1225]" pageId="7" pageNumber="18" pagination="291 - 481" refId="ref14700" refString="Torigoe, K., 1981. Oysters in Japan. Journal of Science-Hiroshima University Series B Division 1, 29: 291 - 481." type="journal article" year="1981">Torigoe, 1981: 377</bibRefCitation>
</treatmentCitation>
, Pl. 15; Lam, 2003: 109-110, Pls. 9, 10.
</treatmentCitationGroup>
</paragraph>
</subSubSection>
<subSubSection id="30A9651F9300F600FCD65764B4EFFA90" pageId="7" pageNumber="18" type="materials_examined">
<paragraph id="780C36949300F600FCD65764B4EFFA90" blockId="7.[813,1452,1290,1340]" pageId="7" pageNumber="18">
<emphasis id="4AC7EA869300F600FCD65764B468FAB3" bold="true" box="[813,1042,1290,1311]" italics="true" pageId="7" pageNumber="18">Material examined. </emphasis>
<typeStatus id="A70888369300F600FBE75764B435FAB3" box="[1052,1103,1290,1311]" pageId="7" pageNumber="18">Type</typeStatus>
not examined, its location being unknown (K. Torigoe, pers. comm.).
</paragraph>
</subSubSection>
<subSubSection id="30A9651F9300F600FCD6570AB45DF8D7" pageId="7" pageNumber="18" type="description">
<paragraph id="780C36949300F600FCD6570AB45DF8D7" blockId="7.[813,1452,1380,1915]" pageId="7" pageNumber="18">
<emphasis id="4AC7EA869300F600FCD6570AB3BDFAD0" bold="true" box="[813,967,1380,1404]" italics="true" pageId="7" pageNumber="18">Description. </emphasis>
Shell outline is orbicular to spatulate; outline tongue-shaped. External surface is whitish with broken rays of purplish brown. The scales of the outer shell layer radiating from the dorsal side are brown to light brown. This species is sympatric with
<taxonomicName id="BFB34D179300F600FC08578AB564FA57" authorityName="Lam &amp; Morton" authorityYear="2003" box="[1011,1310,1508,1531]" class="Bivalvia" family="Ostreidae" genus="Crassostrea" kingdom="Animalia" order="Ostreida" pageId="7" pageNumber="18" phylum="Mollusca" rank="species" species="hongkongensis">
<emphasis id="4AC7EA869300F600FC08578AB564FA57" box="[1011,1310,1508,1531]" italics="true" pageId="7" pageNumber="18">Crassostrea hongkongensis</emphasis>
</taxonomicName>
and is, thus, bored and heavily encrusted by other marine invertebrates in a similar way. Left valve deeply cupped. Right valve usually either flat or slightly convex dorsally and slightly concave near the ventral margin. Internally whitish with hollow chambers of irregular size and position. Hinge line short; the ligament occupying its full length. Attachment area of the left valve is variably small, usually not more than half the shell height. Adductor muscle scar is D-shaped with the outline on the dorsal side being concave and with light to dark purplish growth lines which vary in colour among individuals. Colour may be different on right and left valves in the same individual.
</paragraph>
</subSubSection>
<subSubSection id="30A9651F9300F60FFCD655CAB146FE95" lastPageId="8" lastPageNumber="19" pageId="7" pageNumber="18" type="distribution">
<paragraph id="780C36949300F60FFCD655CAB146FE95" blockId="7.[813,1452,1956,2107]" lastBlockId="8.[136,775,193,313]" lastPageId="8" lastPageNumber="19" pageId="7" pageNumber="18">
<emphasis id="4AC7EA869300F600FCD655CAB3B5F810" bold="true" box="[813,975,1956,1980]" italics="true" pageId="7" pageNumber="18">Distribution. </emphasis>
This species is cultivated in the Pearl River Delta,
<collectingRegion id="BA77F8769300F600FC8055AAB417F877" box="[891,1133,1988,2011]" country="China" name="Guangdong" pageId="7" pageNumber="18">Guangdong Province</collectingRegion>
,
<collectingCountry id="00A476049300F600FB8755AAB4BBF877" box="[1148,1217,1988,2011]" name="China" pageId="7" pageNumber="18">China</collectingCountry>
, i.e. under estuarine conditions. In
<collectingCountry id="00A476049300F600FC33558AB433F857" box="[968,1097,2020,2043]" name="Hong Kong" pageId="7" pageNumber="18">Hong Kong</collectingCountry>
, it occurs only in oyster farms in Deep Bay and is thus cultured with
<taxonomicName id="BFB34D179300F600FAE25A6AB3B1F797" authorityName="Lam &amp; Morton" authorityYear="2003" class="Bivalvia" family="Ostreidae" genus="Crassostrea" kingdom="Animalia" order="Ostreida" pageId="7" pageNumber="18" phylum="Mollusca" rank="species" species="hongkongensis">
<emphasis id="4AC7EA869300F600FAE25A6AB3B1F797" italics="true" pageId="7" pageNumber="18">Crassostrea hongkongensis</emphasis>
</taxonomicName>
but in lower numbers. The species is reported to occur naturally in
<collectingCountry id="00A47604930FF60FFE9652AFB1D0FF74" box="[365,426,193,216]" name="Japan" pageId="8" pageNumber="19">Japan</collectingCountry>
and along the southern coast of
<collectingCountry id="00A47604930FF60FFF73528FB0B1FF54" box="[136,203,225,248]" name="China" pageId="8" pageNumber="19">China</collectingCountry>
to
<collectingCountry id="00A47604930FF60FFF03528FB127FF54" box="[248,349,225,248]" name="Vietnam" pageId="8" pageNumber="19">Vietnam</collectingCountry>
. It is also cultivated in
<collectingRegion id="BA77F876930FF60FFD84528FB2A9FF54" box="[639,723,225,248]" country="United States of America" name="Oregon" pageId="8" pageNumber="19">Oregon</collectingRegion>
and
<collectingRegion id="BA77F876930FF60FFF73536FB175FEB4" box="[136,271,257,280]" country="United States of America" name="Washington" pageId="8" pageNumber="19">Washington</collectingRegion>
, the
<collectingCountry id="00A47604930FF60FFEB1536FB211FEB4" box="[330,619,257,280]" name="United States of America" pageId="8" pageNumber="19">United States of America</collectingCountry>
(Robinson &amp; Langdon, 1992).
</paragraph>
</subSubSection>
<subSubSection id="30A9651F930FF60FFF73530CB38AFE4C" pageId="8" pageNumber="19" type="discussion">
<paragraph id="780C3694930FF60FFF73530CB38AFE4C" blockId="8.[136,775,354,474]" lastBlockId="8.[835,1475,191,480]" pageId="8" pageNumber="19">
<emphasis id="4AC7EA86930FF60FFF73530CB258FED6" box="[136,546,354,378]" italics="true" pageId="8" pageNumber="19">
<emphasis id="4AC7EA86930FF60FFF73530CB174FED6" bold="true" box="[136,270,354,378]" italics="true" pageId="8" pageNumber="19">Remarks. </emphasis>
<taxonomicName id="BFB34D17930FF60FFEE1530DB258FED6" authorityName="Fujita" authorityYear="1913" box="[282,546,355,378]" class="Bivalvia" family="Ostreidae" genus="Crassostrea" kingdom="Animalia" order="Ostreida" pageId="8" pageNumber="19" phylum="Mollusca" rank="species" species="ariakensis">Crassostrea ariakensis</taxonomicName>
</emphasis>
has been called
<taxonomicName id="BFB34D17930FF60FFD16530DB09FFE36" authorityName="Lischke" authorityYear="1869" class="Bivalvia" family="Ostreidae" genus="Ostrea" kingdom="Animalia" order="Ostreida" pageId="8" pageNumber="19" phylum="Mollusca" rank="species" species="rivularis">
<emphasis id="4AC7EA86930FF60FFD16530DB09FFE36" italics="true" pageId="8" pageNumber="19">C. rivularis</emphasis>
</taxonomicName>
, which has been determined to be invalid (
<bibRefCitation id="1C224B65930FF60FFD5253EDB0BAFE16" author="Torigoe, K" pageId="8" pageNumber="19" pagination="291 - 481" refId="ref14700" refString="Torigoe, K., 1981. Oysters in Japan. Journal of Science-Hiroshima University Series B Division 1, 29: 291 - 481." type="journal article" year="1981">Torigoe, 1981</bibRefCitation>
). This is because the
<typeStatus id="A7088836930FF60FFE6353CDB18EFE16" box="[408,500,419,442]" pageId="8" pageNumber="19" type="holotype">holotype</typeStatus>
of
<taxonomicName id="BFB34D17930FF60FFDE853CDB0BAFE76" authority="Gould, 1861" authorityName="Gould" authorityYear="1861" class="Bivalvia" family="Ostreidae" genus="Ostrea" kingdom="Animalia" order="Ostreida" pageId="8" pageNumber="19" phylum="Mollusca" rank="species" species="rivularis">
<emphasis id="4AC7EA86930FF60FFDE853CDB2C0FE16" box="[531,698,419,442]" italics="true" pageId="8" pageNumber="19">Ostrea rivularis</emphasis>
Gould, 1861
</taxonomicName>
, from the East
<collectingCountry id="00A47604930FF60FFEA753ADB1E6FE76" box="[348,412,451,474]" name="China" pageId="8" pageNumber="19">China</collectingCountry>
Sea was in fact a species of
<taxonomicName id="BFB34D17930FF60FFD3853ADB37DFE76" authorityName="Roding" authorityYear="1798" box="[707,775,451,474]" class="Bivalvia" family="Ostreidae" genus="Lopha" kingdom="Animalia" order="Ostreida" pageId="8" pageNumber="19" phylum="Mollusca" rank="genus">
<emphasis id="4AC7EA86930FF60FFD3853ADB37DFE76" box="[707,775,451,474]" italics="true" pageId="8" pageNumber="19">Lopha</emphasis>
</taxonomicName>
and is different from
<taxonomicName id="BFB34D17930FF60FFBD552D1B4D7FF7A" authorityName="Gould" authorityYear="1861" box="[1070,1197,191,214]" class="Bivalvia" family="Ostreidae" genus="Ostrea" kingdom="Animalia" order="Ostreida" pageId="8" pageNumber="19" phylum="Mollusca" rank="species" species="rivularis">
<emphasis id="4AC7EA86930FF60FFBD552D1B4D7FF7A" box="[1070,1197,191,214]" italics="true" pageId="8" pageNumber="19">O. rivularis</emphasis>
</taxonomicName>
as described by
<bibRefCitation id="1C224B65930FF60FFA9D52D1B303FF5F" author="Lischke, C" pageId="8" pageNumber="19" refId="ref13419" refString="Lischke, C. E., 1869. Japanische Meeres-Conchylien. Ein Beitrage zur kenntniss der Mollusken Japan's, mit besonderer Rucksicht auf die Geographische Verbreitung Derselben. Theodor Fischer, Cassel." type="book" year="1869">Lischke, 1869</bibRefCitation>
(Habe &amp; Kosuge, 1967). It is difficult to separate
<taxonomicName id="BFB34D17930FF60FFA5152B3B3C0FEBD" authorityName="Fujita" authorityYear="1913" class="Bivalvia" family="Ostreidae" genus="Crassostrea" kingdom="Animalia" order="Ostreida" pageId="8" pageNumber="19" phylum="Mollusca" rank="species" species="ariakensis">
<emphasis id="4AC7EA86930FF60FFA5152B3B3C0FEBD" italics="true" pageId="8" pageNumber="19">C. ariakensis</emphasis>
</taxonomicName>
and
<taxonomicName id="BFB34D17930FF60FFC005294B4B6FEBD" authorityName="Lam &amp; Morton" authorityYear="2003" box="[1019,1228,250,273]" class="Bivalvia" family="Ostreidae" genus="Crassostrea" kingdom="Animalia" order="Ostreida" pageId="8" pageNumber="19" phylum="Mollusca" rank="species" species="hongkongensis">
<emphasis id="4AC7EA86930FF60FFC005294B4B6FEBD" box="[1019,1228,250,273]" italics="true" pageId="8" pageNumber="19">C. hongkongensis</emphasis>
</taxonomicName>
using external shell characters. In general, however, the former is more rounded and scales on both valves are generally more erect. The definitive morphological distinction between the two is the shape of the adductor muscle. In
<taxonomicName id="BFB34D17930FF60FFB585301B54AFE2A" authorityName="Fujita" authorityYear="1913" box="[1187,1328,367,390]" class="Bivalvia" family="Ostreidae" genus="Crassostrea" kingdom="Animalia" order="Ostreida" pageId="8" pageNumber="19" phylum="Mollusca" rank="species" species="ariakensis">
<emphasis id="4AC7EA86930FF60FFB585301B54AFE2A" box="[1187,1328,367,390]" italics="true" pageId="8" pageNumber="19">C. ariakensis</emphasis>
</taxonomicName>
, the adductor muscle scar is crescent-shaped, whereas in
<taxonomicName id="BFB34D17930FF60FFAFD53E3B5B8FE08" authorityName="Lam &amp; Morton" authorityYear="2003" box="[1286,1474,397,420]" class="Bivalvia" family="Ostreidae" genus="Crassostrea" kingdom="Animalia" order="Ostreida" pageId="8" pageNumber="19" phylum="Mollusca" rank="species" species="hongkongensis">
<emphasis id="4AC7EA86930FF60FFAFD53E3B5B8FE08" box="[1286,1474,397,420]" italics="true" pageId="8" pageNumber="19">C. hongkongensis</emphasis>
</taxonomicName>
the outline of the muscle on the dorsal side is straight to slightly convex.
</paragraph>
</subSubSection>
</treatment>
</document>