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sp. 4-
<bibRefCitation author="Tumpeesuwan, S" journalOrPublisher="Master Thesis, Department of Biology, Faculty of Science, Chulalongkorn University" pageId="0" pageNumber="1" refId="B175" refString="Tumpeesuwan, S, 2001. Taxonomy of snorkel snails genus Rhiostoma Benson, 1860 in Thailand. Master Thesis, Department of Biology, Faculty of Science, Chulalongkorn University" title="Taxonomy of snorkel snails genus Rhiostoma Benson, 1860 in Thailand." year="2001">Tumpeesuwan 2001</bibRefCitation>
<bibRefCitation id="A975B0FF7380E1C91A80F1ED964B90B2" author="Tumpeesuwan, S" journalOrPublisher="Master Thesis, Department of Biology, Faculty of Science, Chulalongkorn University" pageId="0" pageNumber="1" refId="B175" refString="Tumpeesuwan, S, 2001. Taxonomy of snorkel snails genus Rhiostoma Benson, 1860 in Thailand. Master Thesis, Department of Biology, Faculty of Science, Chulalongkorn University" title="Taxonomy of snorkel snails genus Rhiostoma Benson, 1860 in Thailand." year="2001">Tumpeesuwan 2001</bibRefCitation>
: 76-81, figs 4.28-4.30 (in part).
</paragraph>
</subSubSection>
<subSubSection pageId="0" pageNumber="1" type="type material">
<paragraph pageId="0" pageNumber="1">Type material.</paragraph>
<paragraph pageId="0" pageNumber="1">
<emphasis bold="true" italics="true" pageId="0" pageNumber="1">Holotype</emphasis>
<subSubSection id="611AA5DB70BDF29D7EFBB6B9CA123BCB" pageId="0" pageNumber="1" type="type material">
<paragraph id="E0ECC7928473B16E685BD90C1CA3EE88" pageId="0" pageNumber="1">Type material.</paragraph>
<paragraph id="B9A6486353933FD4EAB5BBCC2DC5589F" pageId="0" pageNumber="1">
<emphasis id="A9E84B029F452AF69ADE4B0C2DEF5CCF" bold="true" italics="true" pageId="0" pageNumber="1">Holotype</emphasis>
CUMZ 3985/1 (W 18.2 mm, H 10.3; Fig.
<figureCitation captionStart="Figure 50" captionStartId="F50" captionText="Figure 50. Shell of Rhiostoma cheliopegma sp. nov. A holotype CUMZ 3985 / 1 from Tham Takien, Khao Chamao, Rayong B, C paratypes CUMZ 3985 / 2 from type locality D, E from Tham Khao Loi, Khao Chamao, Rayong D specimen CUMZ 4818 and E specimen CUMZ 4871 F paratype CUMZ 4853 from type locality with albinistic shell form." figureDoi="10.3897/zookeys.1142.90097.figure50" httpUri="https://binary.pensoft.net/fig/799908" pageId="0" pageNumber="1">50A</figureCitation>
<figureCitation id="56C65C956FB68297F92264A7B3FFC15D" captionStart="Figure 50" captionStartId="F50" captionText="Figure 50. Shell of Rhiostoma cheliopegma sp. nov. A holotype CUMZ 3985 / 1 from Tham Takien, Khao Chamao, Rayong B, C paratypes CUMZ 3985 / 2 from type locality D, E from Tham Khao Loi, Khao Chamao, Rayong D specimen CUMZ 4818 and E specimen CUMZ 4871 F paratype CUMZ 4853 from type locality with albinistic shell form." figureDoi="10.3897/zookeys.1142.90097.figure50" httpUri="https://binary.pensoft.net/fig/799908" pageId="0" pageNumber="1">50A</figureCitation>
).
<emphasis bold="true" italics="true" pageId="0" pageNumber="1">Paratypes</emphasis>
<emphasis id="1C3B49E05B3A1D0B515C9E18BFE9486F" bold="true" italics="true" pageId="0" pageNumber="1">Paratypes</emphasis>
CUMZ 3985/2 (13 shells; Figs
<figureCitation captionStart="Figure 50" captionStartId="F50" captionText="Figure 50. Shell of Rhiostoma cheliopegma sp. nov. A holotype CUMZ 3985 / 1 from Tham Takien, Khao Chamao, Rayong B, C paratypes CUMZ 3985 / 2 from type locality D, E from Tham Khao Loi, Khao Chamao, Rayong D specimen CUMZ 4818 and E specimen CUMZ 4871 F paratype CUMZ 4853 from type locality with albinistic shell form." figureDoi="10.3897/zookeys.1142.90097.figure50" httpUri="https://binary.pensoft.net/fig/799908" pageId="0" pageNumber="1">50B, C</figureCitation>
<figureCitation id="C514478F66F91D56A786A888843CEC16" captionStart="Figure 50" captionStartId="F50" captionText="Figure 50. Shell of Rhiostoma cheliopegma sp. nov. A holotype CUMZ 3985 / 1 from Tham Takien, Khao Chamao, Rayong B, C paratypes CUMZ 3985 / 2 from type locality D, E from Tham Khao Loi, Khao Chamao, Rayong D specimen CUMZ 4818 and E specimen CUMZ 4871 F paratype CUMZ 4853 from type locality with albinistic shell form." figureDoi="10.3897/zookeys.1142.90097.figure50" httpUri="https://binary.pensoft.net/fig/799908" pageId="0" pageNumber="1">50B, C</figureCitation>
,
<figureCitation captionStart="Figure 53" captionStartId="F53" captionText="Figure 53. Radula morphology A Rhiostoma cambodjense, specimens CUMZ 4714 from Khao Chakan, Srakeo B Rhiostoma cheliopegma sp. nov., paratype CUMZ CUMZ 3985 / 2 Tham Takien, Khao Chamao, Rayong C Rhiostoma gnomus sp. nov. paratype CUMZ 4717 from Pha Chu, Na Noi, Nan D Rhiostoma laosense sp. nov. specimen CUMZ 10205 from Tad Muang, Khammouane, Laos." figureDoi="10.3897/zookeys.1142.90097.figure53" httpUri="https://binary.pensoft.net/fig/799911" pageId="0" pageNumber="1">53B</figureCitation>
<figureCitation id="E78C917FECC14F22F20DD9EF94210DAA" captionStart="Figure 53" captionStartId="F53" captionText="Figure 53. Radula morphology A Rhiostoma cambodjense, specimens CUMZ 4714 from Khao Chakan, Srakeo B Rhiostoma cheliopegma sp. nov., paratype CUMZ CUMZ 3985 / 2 Tham Takien, Khao Chamao, Rayong C Rhiostoma gnomus sp. nov. paratype CUMZ 4717 from Pha Chu, Na Noi, Nan D Rhiostoma laosense sp. nov. specimen CUMZ 10205 from Tad Muang, Khammouane, Laos." figureDoi="10.3897/zookeys.1142.90097.figure53" httpUri="https://binary.pensoft.net/fig/799911" pageId="0" pageNumber="1">53B</figureCitation>
), CUMZ 4470 (55 adults + 14 juveniles), CUMZ 4853 (10 shells; Fig.
<figureCitation captionStart="Figure 50" captionStartId="F50" captionText="Figure 50. Shell of Rhiostoma cheliopegma sp. nov. A holotype CUMZ 3985 / 1 from Tham Takien, Khao Chamao, Rayong B, C paratypes CUMZ 3985 / 2 from type locality D, E from Tham Khao Loi, Khao Chamao, Rayong D specimen CUMZ 4818 and E specimen CUMZ 4871 F paratype CUMZ 4853 from type locality with albinistic shell form." figureDoi="10.3897/zookeys.1142.90097.figure50" httpUri="https://binary.pensoft.net/fig/799908" pageId="0" pageNumber="1">50F</figureCitation>
<figureCitation id="6577BA3705429EF95F81A5F09CA794AB" captionStart="Figure 50" captionStartId="F50" captionText="Figure 50. Shell of Rhiostoma cheliopegma sp. nov. A holotype CUMZ 3985 / 1 from Tham Takien, Khao Chamao, Rayong B, C paratypes CUMZ 3985 / 2 from type locality D, E from Tham Khao Loi, Khao Chamao, Rayong D specimen CUMZ 4818 and E specimen CUMZ 4871 F paratype CUMZ 4853 from type locality with albinistic shell form." figureDoi="10.3897/zookeys.1142.90097.figure50" httpUri="https://binary.pensoft.net/fig/799908" pageId="0" pageNumber="1">50F</figureCitation>
), NHMUK 20220446 (5 shells), and SMF 368681 (5 shells). All paratypes are from the type locality.
</paragraph>
<caption doi="10.3897/zookeys.1142.90097.figure50" httpUri="https://binary.pensoft.net/fig/799908" pageId="0" pageNumber="1" start="Figure 50" startId="F50">
<paragraph pageId="0" pageNumber="1">
<emphasis bold="true" pageId="0" pageNumber="1">Figure 50.</emphasis>
<caption id="0CCFAED963772B99C79817F29B68455B" doi="10.3897/zookeys.1142.90097.figure50" httpUri="https://binary.pensoft.net/fig/799908" pageId="0" pageNumber="1" start="Figure 50" startId="F50">
<paragraph id="B9C57760B306ED4DE39DEE7B6A37137A" pageId="0" pageNumber="1">
<emphasis id="DF45A2BB3DF1E93CB5A54D1C7EBC9CE6" bold="true" pageId="0" pageNumber="1">Figure 50.</emphasis>
Shell of
<taxonomicName authorityName="Tongkerd &amp; Tumpeesuwan" authorityYear="2023" class="Gastropoda" family="Cyclophoridae" genus="Rhiostoma" kingdom="Animalia" lsidName="Rhiostoma cheliopegma" order="Architaenioglossa" pageId="0" pageNumber="1" phylum="Mollusca" rank="species" species="cheliopegma">
<emphasis italics="true" pageId="0" pageNumber="1">Rhiostoma cheliopegma</emphasis>
<taxonomicName id="0E4C0598C08009780EA67E2B2AD0BFCA" authorityName="Tongkerd &amp; Tumpeesuwan" authorityYear="2023" class="Gastropoda" family="Cyclophoridae" genus="Rhiostoma" kingdom="Animalia" lsidName="Rhiostoma cheliopegma" order="Architaenioglossa" pageId="0" pageNumber="1" phylum="Mollusca" rank="species" species="cheliopegma">
<emphasis id="4AB5077B6AA55EBE0210E8348750B7FF" italics="true" pageId="0" pageNumber="1">Rhiostoma cheliopegma</emphasis>
</taxonomicName>
sp. nov.
<emphasis bold="true" pageId="0" pageNumber="1">A</emphasis>
<emphasis id="F15626BD614CBB44848EFA8690A51948" bold="true" pageId="0" pageNumber="1">A</emphasis>
holotype CUMZ 3985/1 from Tham Takien, Khao Chamao, Rayong
<emphasis bold="true" pageId="0" pageNumber="1">B, C</emphasis>
<emphasis id="5CE73CB1C95B4931226DA494C3DE23D3" bold="true" pageId="0" pageNumber="1">B, C</emphasis>
paratypes CUMZ 3985/2 from type locality
<emphasis bold="true" pageId="0" pageNumber="1">D, E</emphasis>
<emphasis id="663AB219B0DBA1AB895AD364ACB6A463" bold="true" pageId="0" pageNumber="1">D, E</emphasis>
from Tham Khao Loi, Khao Chamao, Rayong
<emphasis bold="true" pageId="0" pageNumber="1">D</emphasis>
<emphasis id="CDB5035C91D8CA66F0DA5DFF83FAB304" bold="true" pageId="0" pageNumber="1">D</emphasis>
specimen CUMZ 4818 and
<emphasis bold="true" pageId="0" pageNumber="1">E</emphasis>
<emphasis id="1A44E66468642426B2BCD1483642DB20" bold="true" pageId="0" pageNumber="1">E</emphasis>
specimen CUMZ 4871
<emphasis bold="true" pageId="0" pageNumber="1">F</emphasis>
<emphasis id="EFAC3EEFAEB1E40CA560E57C72AFFD01" bold="true" pageId="0" pageNumber="1">F</emphasis>
paratype CUMZ 4853 from type locality with albinistic shell form.
</paragraph>
</caption>
</subSubSection>
<subSubSection pageId="0" pageNumber="1" type="type locality">
<paragraph pageId="0" pageNumber="1">Type locality.</paragraph>
<paragraph pageId="0" pageNumber="1">
<subSubSection id="DCDED2B66D6E60AEE73506E94031DC78" pageId="0" pageNumber="1" type="type locality">
<paragraph id="4F4B336C6A220D69568FAB4DAE6233AE" pageId="0" pageNumber="1">Type locality.</paragraph>
<paragraph id="3676758B25AD219E7339229023173863" pageId="0" pageNumber="1">
Isolated limestone hill at Tham Takien, Khao Chamao District, Rayong Province, Thailand (
<geoCoordinate degrees="13" direction="north" minutes="05" orientation="latitude" precision="1" seconds="30.0" value="13.091666">13°05'30.0&quot;N</geoCoordinate>
<geoCoordinate id="51283C6B4B5A0A9AD5D9B9199DCCEDCB" degrees="13" direction="north" minutes="05" orientation="latitude" precision="1" seconds="30.0" value="13.091666">13°05'30.0&quot;N</geoCoordinate>
,
<geoCoordinate degrees="101" direction="east" minutes="36" orientation="longitude" precision="1" seconds="27.7" value="101.6077">101°36'27.7&quot;E</geoCoordinate>
<geoCoordinate id="9E36D810D17E98368147B47DC22C8FC2" degrees="101" direction="east" minutes="36" orientation="longitude" precision="1" seconds="27.7" value="101.6077">101°36'27.7&quot;E</geoCoordinate>
).
</paragraph>
</subSubSection>
<subSubSection pageId="0" pageNumber="1" type="materials_examined">
<paragraph pageId="0" pageNumber="1">Other material examined.</paragraph>
<paragraph pageId="0" pageNumber="1">
<materialsCitation collectingDate="2023-01-01" collectingDateMax="2023-12-31" collectingDateMin="2023-01-01" country="Thailand" location="Tham Neramit Bureau of Monks" specimenCount="1" stateProvince="Chonburi">
<emphasis bold="true" pageId="0" pageNumber="1">
<collectingCountry name="Thailand">Thailand</collectingCountry>
<subSubSection id="CCE454EB77D98B46D7A97571A9029F7A" pageId="0" pageNumber="1" type="materials_examined">
<paragraph id="331752560CDC6C349CE206225C35D26A" pageId="0" pageNumber="1">Other material examined.</paragraph>
<paragraph id="E470A056F3CC99705B23CE2510D3EDBE" pageId="0" pageNumber="1">
<materialsCitation id="6C713980939212112D1D73917385EA46" collectingDate="2023-01-01" collectingDateMax="2023-12-31" collectingDateMin="2023-01-01" country="Thailand" location="Tham Neramit Bureau of Monks" specimenCount="1" stateProvince="Chonburi">
<emphasis id="10B89886438CF144D98E464280696F6B" bold="true" pageId="0" pageNumber="1">
<collectingCountry id="9E18E1BF5EDE26FA274568C665971B0F" name="Thailand">Thailand</collectingCountry>
</emphasis>
: Khao Cha-Ang Oun, Bo Thong,
<collectingRegion country="Thailand" name="Chon Buri">Chonburi</collectingRegion>
<collectingRegion id="27AB52DF4B4EC87B41EA011DECC19F13" country="Thailand" name="Chon Buri">Chonburi</collectingRegion>
: CUMZ 3809, 3818, 3861, 3984, 4377, 4448, 4461, 4755/1, 4886, 10053, 10054, 10055, 10057, 10058, 10060. Khao Cha-Ang, Bo Thong,
<collectingRegion country="Thailand" name="Chon Buri">Chonburi</collectingRegion>
<collectingRegion id="45FD4B340D0EF6CA1C3A79A966277E88" country="Thailand" name="Chon Buri">Chonburi</collectingRegion>
: CUMZ 4755/2, 4824, 4847, 4865. Khao Ha Yot, Bo Thong,
<collectingRegion country="Thailand" name="Chon Buri">Chonburi</collectingRegion>
<collectingRegion id="EEB62182A317A38BC7F380525162CBAF" country="Thailand" name="Chon Buri">Chonburi</collectingRegion>
: CUMZ 4833, 10052, 10059, 10082. Khao Tham Mi, Bo Thong,
<collectingRegion country="Thailand" name="Chon Buri">Chonburi</collectingRegion>
<collectingRegion id="2E2622386B89FD3E6278F35C15695ED3" country="Thailand" name="Chon Buri">Chonburi</collectingRegion>
: CUMZ 10081. Tham Khao Prathun, Bo Thong,
<collectingRegion country="Thailand" name="Chon Buri">Chonburi</collectingRegion>
<collectingRegion id="8F2D81D27A0C6FD6F39F1637DC61F3FB" country="Thailand" name="Chon Buri">Chonburi</collectingRegion>
: CUMZ 4860. Wat Pluang Thong, Bo Thong,
<collectingRegion country="Thailand" name="Chon Buri">Chonburi</collectingRegion>
<collectingRegion id="E7EEF182C9EE15426E764B5AABBE778D" country="Thailand" name="Chon Buri">Chonburi</collectingRegion>
: CUMZ 4354, 4355, 4357, 4360. Tham Khao Bost, Khao Chamao,
<collectingRegion country="Thailand" name="Rayong">Rayong</collectingRegion>
<collectingRegion id="64790E6E671DD22D50B10D66593B05DE" country="Thailand" name="Rayong">Rayong</collectingRegion>
: CUMZ 4884/2.
<location LSID="urn:lsid:plazi:treatment:4AD27BA693EF5C3C8227360D6DFFE297:5D89BCBF593E4322B82D010375649CBF" country="Thailand" name="Tham Neramit Bureau of Monks" stateProvince="Chonburi">Tham Neramit Bureau of Monks</location>
<location id="5D89BCBF593E4322B82D010375649CBF" LSID="urn:lsid:plazi:treatment:4AD27BA693EF5C3C8227360D6DFFE297:5D89BCBF593E4322B82D010375649CBF" country="Thailand" name="Tham Neramit Bureau of Monks" stateProvince="Chonburi">Tham Neramit Bureau of Monks</location>
, Khao Chamao,
<collectingRegion country="Thailand" name="Rayong">Rayong</collectingRegion>
<collectingRegion id="4368DC3836F0AC4852EB4C09809057C3" country="Thailand" name="Rayong">Rayong</collectingRegion>
: CUMZ 4468, 4876. Wat Ma Diea, Tham Khao Loy, Khao Chamao,
<collectingRegion country="Thailand" name="Rayong">Rayong</collectingRegion>
<collectingRegion id="76BCFD0991BD6AD8FE16A65E6A1ECD71" country="Thailand" name="Rayong">Rayong</collectingRegion>
: CUMZ 4467, 4469, 4815, 4818 (Fig.
<figureCitation captionStart="Figure 50" captionStartId="F50" captionText="Figure 50. Shell of Rhiostoma cheliopegma sp. nov. A holotype CUMZ 3985 / 1 from Tham Takien, Khao Chamao, Rayong B, C paratypes CUMZ 3985 / 2 from type locality D, E from Tham Khao Loi, Khao Chamao, Rayong D specimen CUMZ 4818 and E specimen CUMZ 4871 F paratype CUMZ 4853 from type locality with albinistic shell form." figureDoi="10.3897/zookeys.1142.90097.figure50" httpUri="https://binary.pensoft.net/fig/799908" pageId="0" pageNumber="1">50D</figureCitation>
<figureCitation id="6E77F9957AE351E3DF411328D215C5A0" captionStart="Figure 50" captionStartId="F50" captionText="Figure 50. Shell of Rhiostoma cheliopegma sp. nov. A holotype CUMZ 3985 / 1 from Tham Takien, Khao Chamao, Rayong B, C paratypes CUMZ 3985 / 2 from type locality D, E from Tham Khao Loi, Khao Chamao, Rayong D specimen CUMZ 4818 and E specimen CUMZ 4871 F paratype CUMZ 4853 from type locality with albinistic shell form." figureDoi="10.3897/zookeys.1142.90097.figure50" httpUri="https://binary.pensoft.net/fig/799908" pageId="0" pageNumber="1">50D</figureCitation>
), 4871 (Fig.
<figureCitation captionStart="Figure 50" captionStartId="F50" captionText="Figure 50. Shell of Rhiostoma cheliopegma sp. nov. A holotype CUMZ 3985 / 1 from Tham Takien, Khao Chamao, Rayong B, C paratypes CUMZ 3985 / 2 from type locality D, E from Tham Khao Loi, Khao Chamao, Rayong D specimen CUMZ 4818 and E specimen CUMZ 4871 F paratype CUMZ 4853 from type locality with albinistic shell form." figureDoi="10.3897/zookeys.1142.90097.figure50" httpUri="https://binary.pensoft.net/fig/799908" pageId="0" pageNumber="1">50E</figureCitation>
<figureCitation id="687EF7F7EEA7138AFCAC1B39E7B37644" captionStart="Figure 50" captionStartId="F50" captionText="Figure 50. Shell of Rhiostoma cheliopegma sp. nov. A holotype CUMZ 3985 / 1 from Tham Takien, Khao Chamao, Rayong B, C paratypes CUMZ 3985 / 2 from type locality D, E from Tham Khao Loi, Khao Chamao, Rayong D specimen CUMZ 4818 and E specimen CUMZ 4871 F paratype CUMZ 4853 from type locality with albinistic shell form." figureDoi="10.3897/zookeys.1142.90097.figure50" httpUri="https://binary.pensoft.net/fig/799908" pageId="0" pageNumber="1">50E</figureCitation>
), 10083. Wat Tham Wattana Mongkon, Khao Chamao,
<collectingRegion country="Thailand" name="Rayong">Rayong</collectingRegion>
<collectingRegion id="A16BC2662E963D6564C1B9BDE6FE6832" country="Thailand" name="Rayong">Rayong</collectingRegion>
: CUMZ 4864
</materialsCitation>
.
</paragraph>
</subSubSection>
<subSubSection pageId="0" pageNumber="1" type="diagnosis">
<paragraph pageId="0" pageNumber="1">Diagnosis.</paragraph>
<paragraph pageId="0" pageNumber="1">Shell small, depressed, and without detached whorl. Peristome multi-layered; lip thickened; breathing device notch-shaped. Shell colour usually uniformly reddish to dark brown. Operculum calcareous, thick, tall cup-shaped, and multispiral.</paragraph>
<subSubSection id="56C3415001A0D0CFBAB9CA7A4A5B3035" pageId="0" pageNumber="1" type="diagnosis">
<paragraph id="061A7CDDEA5BC012E9571AC32D9C0DD1" pageId="0" pageNumber="1">Diagnosis.</paragraph>
<paragraph id="0073048443959438995BFB45BD23F7A0" pageId="0" pageNumber="1">Shell small, depressed, and without detached whorl. Peristome multi-layered; lip thickened; breathing device notch-shaped. Shell colour usually uniformly reddish to dark brown. Operculum calcareous, thick, tall cup-shaped, and multispiral.</paragraph>
</subSubSection>
<subSubSection pageId="0" pageNumber="1" type="differential diagnosis">
<paragraph pageId="0" pageNumber="1">Differential diagnosis.</paragraph>
<paragraph pageId="0" pageNumber="1">
<subSubSection id="BDBCAB59E404B61827CC1FFAECCB6511" pageId="0" pageNumber="1" type="differential diagnosis">
<paragraph id="239567C38291AB4AA2FF16A74F3AB0B1" pageId="0" pageNumber="1">Differential diagnosis.</paragraph>
<paragraph id="805EA0847C5AAA39BC29BC7D0B8AD445" pageId="0" pageNumber="1">
This new species is superficially similar to
<taxonomicName lsidName="R. cambodjense" pageId="0" pageNumber="1" rank="species" species="cambodjense">
<emphasis italics="true" pageId="0" pageNumber="1">R. cambodjense</emphasis>
<taxonomicName id="522CD4D49262DD1D5D838C367952B4B8" lsidName="R. cambodjense" pageId="0" pageNumber="1" rank="species" species="cambodjense">
<emphasis id="7C64AD53AA0CAEAA6A49D47FE6A5A8B6" italics="true" pageId="0" pageNumber="1">R. cambodjense</emphasis>
</taxonomicName>
, and the two species are distributed in nearby geographical areas in eastern Thailand.
<taxonomicName authorityName="Tongkerd &amp; Tumpeesuwan" authorityYear="2023" class="Gastropoda" family="Cyclophoridae" genus="Rhiostoma" kingdom="Animalia" lsidName="Rhiostoma cheliopegma" order="Architaenioglossa" pageId="0" pageNumber="1" phylum="Mollusca" rank="species" species="cheliopegma">
<emphasis italics="true" pageId="0" pageNumber="1">Rhiostoma cheliopegma</emphasis>
<taxonomicName id="5181C525D232D61757DC38E13E32297B" authorityName="Tongkerd &amp; Tumpeesuwan" authorityYear="2023" class="Gastropoda" family="Cyclophoridae" genus="Rhiostoma" kingdom="Animalia" lsidName="Rhiostoma cheliopegma" order="Architaenioglossa" pageId="0" pageNumber="1" phylum="Mollusca" rank="species" species="cheliopegma">
<emphasis id="738D05454B4744B9EA72FA8A8AC6DDB3" italics="true" pageId="0" pageNumber="1">Rhiostoma cheliopegma</emphasis>
</taxonomicName>
sp. nov. differs from
<taxonomicName lsidName="R. cambodjense" pageId="0" pageNumber="1" rank="species" species="cambodjense">
<emphasis italics="true" pageId="0" pageNumber="1">R. cambodjense</emphasis>
<taxonomicName id="7812518581F8BD6A920963CA419D0145" lsidName="R. cambodjense" pageId="0" pageNumber="1" rank="species" species="cambodjense">
<emphasis id="94E7D21D93FF886A8A7AEC8D4B514102" italics="true" pageId="0" pageNumber="1">R. cambodjense</emphasis>
</taxonomicName>
by a sub-discoidal shell, a uniform or blotched reddish brown colour pattern, apertural lip thickened, and expanded tall cup-shaped operculum. For comparison,
<taxonomicName lsidName="R. cambodjense" pageId="0" pageNumber="1" rank="species" species="cambodjense">
<emphasis italics="true" pageId="0" pageNumber="1">R. cambodjense</emphasis>
<taxonomicName id="E01384CA4A5E260B67C71858923E2BF0" lsidName="R. cambodjense" pageId="0" pageNumber="1" rank="species" species="cambodjense">
<emphasis id="5C23DDF99C757EB0F05A80A4B6AB03B3" italics="true" pageId="0" pageNumber="1">R. cambodjense</emphasis>
</taxonomicName>
has a heliciform shell, uniformly brownish or yellowish shell, apertural lip thin, and low cup-shaped operculum. In addition, the COI barcoding in this study suggests separating these two species (Fig.
<figureCitation captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. Maximum likelihood (ML) tree showing the relationships among Rhiostoma species based on 660 bp of the mitochondrial COI gene sequence. The major nodes are indicated by numbers as the Maximum likelihood (ML) bootstrap values and Bayesian posterior probabilities of Bayesian inference (BI), respectively. Nodes with sufficient support by both ML and BI are indicated by black circles, and nodes with partial support by only ML are indicated by grey circles, and only BI by white circles. Newly described species in this study are highlighted in blue." figureDoi="10.3897/zookeys.1142.90097.figure3" httpUri="https://binary.pensoft.net/fig/799861" pageId="0" pageNumber="1">3</figureCitation>
<figureCitation id="69AB3C2A5544C0D68D8D5C4F2FBB0B87" captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. Maximum likelihood (ML) tree showing the relationships among Rhiostoma species based on 660 bp of the mitochondrial COI gene sequence. The major nodes are indicated by numbers as the Maximum likelihood (ML) bootstrap values and Bayesian posterior probabilities of Bayesian inference (BI), respectively. Nodes with sufficient support by both ML and BI are indicated by black circles, and nodes with partial support by only ML are indicated by grey circles, and only BI by white circles. Newly described species in this study are highlighted in blue." figureDoi="10.3897/zookeys.1142.90097.figure3" httpUri="https://binary.pensoft.net/fig/799861" pageId="0" pageNumber="1">3</figureCitation>
).
</paragraph>
</subSubSection>
<subSubSection pageId="0" pageNumber="1" type="description">
<paragraph pageId="0" pageNumber="1">Description.</paragraph>
<paragraph pageId="0" pageNumber="1">
<emphasis bold="true" pageId="0" pageNumber="1">
<emphasis italics="true" pageId="0" pageNumber="1">Shell</emphasis>
<subSubSection id="97DDE57AD346DE2A8DC37D407B6D7091" pageId="0" pageNumber="1" type="description">
<paragraph id="75D1D7F8C545E9313F5DB174AB354D17" pageId="0" pageNumber="1">Description.</paragraph>
<paragraph id="174C1AA5B047866BB161E741B35DC921" pageId="0" pageNumber="1">
<emphasis id="03A9031285363AEBEE2831F7B6E7EDFB" bold="true" pageId="0" pageNumber="1">
<emphasis id="812CD0EBE9DA50DE62F58744BA5EFFC0" italics="true" pageId="0" pageNumber="1">Shell</emphasis>
.
</emphasis>
Shell small, width 17.1-20.0 mm, height 5.8-11.5 mm, thickened, and sub-discoidal shape. Apex acute with dark colouration; spire slightly elevated. Whorls 4 to 5, convex, increasing regularly; suture wide and shallow; last whorl rounded. Shell surface nearly smooth with fine growth lines. Periostracum thin, corneous, and transparent. Shell colour usually uniformly reddish to dark brownish (rarely with albinistic forms), sometimes with unclear patterns; with narrow dark brown spiral band on periphery. Detached whorl usually absent. Peristome circular and double; lip thickened, expanded and multi-layered. Aperture opened sub-laterally. Breathing device notch-shaped; outer lip protruding, with narrow groove; inner lip with shallow to deep incision. Umbilicus widely opened and deep. Operculum calcareous, thickened, tall and cup-shaped, and multispiral (Fig.
<figureCitation captionStart="Figure 50" captionStartId="F50" captionText="Figure 50. Shell of Rhiostoma cheliopegma sp. nov. A holotype CUMZ 3985 / 1 from Tham Takien, Khao Chamao, Rayong B, C paratypes CUMZ 3985 / 2 from type locality D, E from Tham Khao Loi, Khao Chamao, Rayong D specimen CUMZ 4818 and E specimen CUMZ 4871 F paratype CUMZ 4853 from type locality with albinistic shell form." figureDoi="10.3897/zookeys.1142.90097.figure50" httpUri="https://binary.pensoft.net/fig/799908" pageId="0" pageNumber="1">50</figureCitation>
<figureCitation id="F860F690B2F7E854CD91B2B15CFA684A" captionStart="Figure 50" captionStartId="F50" captionText="Figure 50. Shell of Rhiostoma cheliopegma sp. nov. A holotype CUMZ 3985 / 1 from Tham Takien, Khao Chamao, Rayong B, C paratypes CUMZ 3985 / 2 from type locality D, E from Tham Khao Loi, Khao Chamao, Rayong D specimen CUMZ 4818 and E specimen CUMZ 4871 F paratype CUMZ 4853 from type locality with albinistic shell form." figureDoi="10.3897/zookeys.1142.90097.figure50" httpUri="https://binary.pensoft.net/fig/799908" pageId="0" pageNumber="1">50</figureCitation>
).
</paragraph>
<paragraph pageId="0" pageNumber="1">
<emphasis bold="true" pageId="0" pageNumber="1">
<emphasis italics="true" pageId="0" pageNumber="1">Radula</emphasis>
<paragraph id="91F88C0ACAE12250388E3818F665D5FE" pageId="0" pageNumber="1">
<emphasis id="4001FAFA1812672B4105435F13FB384C" bold="true" pageId="0" pageNumber="1">
<emphasis id="F9666B5817A104CB9B0A90E83458F2E5" italics="true" pageId="0" pageNumber="1">Radula</emphasis>
.
</emphasis>
Teeth arrangement and shape are similar to those of
<taxonomicName lsidName="R. cambodjense" pageId="0" pageNumber="1" rank="species" species="cambodjense">
<emphasis italics="true" pageId="0" pageNumber="1">R. cambodjense</emphasis>
<taxonomicName id="17A90C652DAEA21ADD49998315D278E7" lsidName="R. cambodjense" pageId="0" pageNumber="1" rank="species" species="cambodjense">
<emphasis id="0CFCDA26C79FC44F8C1C6F79CC78F7F5" italics="true" pageId="0" pageNumber="1">R. cambodjense</emphasis>
</taxonomicName>
. Central tooth with large central cusp and two lateral cusps on each side. Lateral teeth have four cusps: central cusp large, triangular, and flanked by two small inner cusps and one outer cusp. Marginal teeth each consisting of three pointed cusps (Fig.
<figureCitation captionStart="Figure 53" captionStartId="F53" captionText="Figure 53. Radula morphology A Rhiostoma cambodjense, specimens CUMZ 4714 from Khao Chakan, Srakeo B Rhiostoma cheliopegma sp. nov., paratype CUMZ CUMZ 3985 / 2 Tham Takien, Khao Chamao, Rayong C Rhiostoma gnomus sp. nov. paratype CUMZ 4717 from Pha Chu, Na Noi, Nan D Rhiostoma laosense sp. nov. specimen CUMZ 10205 from Tad Muang, Khammouane, Laos." figureDoi="10.3897/zookeys.1142.90097.figure53" httpUri="https://binary.pensoft.net/fig/799911" pageId="0" pageNumber="1">53B</figureCitation>
<figureCitation id="CC9A74A91E7CC47614E58B309275237F" captionStart="Figure 53" captionStartId="F53" captionText="Figure 53. Radula morphology A Rhiostoma cambodjense, specimens CUMZ 4714 from Khao Chakan, Srakeo B Rhiostoma cheliopegma sp. nov., paratype CUMZ CUMZ 3985 / 2 Tham Takien, Khao Chamao, Rayong C Rhiostoma gnomus sp. nov. paratype CUMZ 4717 from Pha Chu, Na Noi, Nan D Rhiostoma laosense sp. nov. specimen CUMZ 10205 from Tad Muang, Khammouane, Laos." figureDoi="10.3897/zookeys.1142.90097.figure53" httpUri="https://binary.pensoft.net/fig/799911" pageId="0" pageNumber="1">53B</figureCitation>
).
</paragraph>
</subSubSection>
<subSubSection pageId="0" pageNumber="1" type="etymology">
<paragraph pageId="0" pageNumber="1">Etymology.</paragraph>
<paragraph pageId="0" pageNumber="1">
<subSubSection id="9D69D16E5232C9B3CF707F1B15CF1495" pageId="0" pageNumber="1" type="etymology">
<paragraph id="A11FE494DE8E55716670DF32F6DADB95" pageId="0" pageNumber="1">Etymology.</paragraph>
<paragraph id="E6F4D4322E1897AD174ADB5702F16D76" pageId="0" pageNumber="1">
The species name
<emphasis italics="true" pageId="0" pageNumber="1">cheliopegma</emphasis>
<emphasis id="F45796F1073B3DB63A4A94AC885E770F" italics="true" pageId="0" pageNumber="1">cheliopegma</emphasis>
is derived from two Greek words
<emphasis italics="true" pageId="0" pageNumber="1">cheilos</emphasis>
<emphasis id="AFEE43E21E551C1E4AE62F6EA673A7A7" italics="true" pageId="0" pageNumber="1">cheilos</emphasis>
meaning lip or rim, and
<emphasis italics="true" pageId="0" pageNumber="1">pegma</emphasis>
<emphasis id="B87B6C0ED61CBF88ABA21647B8DDE438" italics="true" pageId="0" pageNumber="1">pegma</emphasis>
meaning thickened. This name refers to the strongly thickened apertural lip, which is the distinct character of this species.
</paragraph>
</subSubSection>
<subSubSection pageId="0" pageNumber="1" type="distribution">
<paragraph pageId="0" pageNumber="1">Distribution.</paragraph>
<paragraph pageId="0" pageNumber="1">
<subSubSection id="69A66484554017B245B3A98B602B2352" pageId="0" pageNumber="1" type="distribution">
<paragraph id="4EF3A91A6046B37746C1AA2A35BBE90E" pageId="0" pageNumber="1">Distribution.</paragraph>
<paragraph id="CB5DA92476FC6FA069762D380D74396E" pageId="0" pageNumber="1">
This new subspecies is known from several isolated limestone hills in Chonburi and Rayong provinces, eastern Thailand (Fig.
<figureCitation captionStart="Figure 44" captionStartId="F44" captionText="Figure 44. Distribution map of Rhiostoma morleti - species group." figureDoi="10.3897/zookeys.1142.90097.figure44" httpUri="https://binary.pensoft.net/fig/799902" pageId="0" pageNumber="1">44</figureCitation>
<figureCitation id="4A6260CB8D110DBD67A4CA5FC41A5F24" captionStart="Figure 44" captionStartId="F44" captionText="Figure 44. Distribution map of Rhiostoma morleti - species group." figureDoi="10.3897/zookeys.1142.90097.figure44" httpUri="https://binary.pensoft.net/fig/799902" pageId="0" pageNumber="1">44</figureCitation>
).
</paragraph>
</subSubSection>
<subSubSection pageId="0" pageNumber="1" type="remarks">
<paragraph pageId="0" pageNumber="1">Remarks.</paragraph>
<paragraph pageId="0" pageNumber="1">
<subSubSection id="657F1ACE55B0E3656F3F04A7FD07139C" pageId="0" pageNumber="1" type="remarks">
<paragraph id="075597DE8218B58FB57BA24BDE9E6CB9" pageId="0" pageNumber="1">Remarks.</paragraph>
<paragraph id="BC08A1D08398DEEA8DB5C59FD0D973B7" pageId="0" pageNumber="1">
Despite the COI barcoding seeming to show two subclades (Chonburi and Rayong populations) within this species (Fig.
<figureCitation captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. Maximum likelihood (ML) tree showing the relationships among Rhiostoma species based on 660 bp of the mitochondrial COI gene sequence. The major nodes are indicated by numbers as the Maximum likelihood (ML) bootstrap values and Bayesian posterior probabilities of Bayesian inference (BI), respectively. Nodes with sufficient support by both ML and BI are indicated by black circles, and nodes with partial support by only ML are indicated by grey circles, and only BI by white circles. Newly described species in this study are highlighted in blue." figureDoi="10.3897/zookeys.1142.90097.figure3" httpUri="https://binary.pensoft.net/fig/799861" pageId="0" pageNumber="1">3</figureCitation>
<figureCitation id="0C91C26559801361BC0D1E3C7DA77003" captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. Maximum likelihood (ML) tree showing the relationships among Rhiostoma species based on 660 bp of the mitochondrial COI gene sequence. The major nodes are indicated by numbers as the Maximum likelihood (ML) bootstrap values and Bayesian posterior probabilities of Bayesian inference (BI), respectively. Nodes with sufficient support by both ML and BI are indicated by black circles, and nodes with partial support by only ML are indicated by grey circles, and only BI by white circles. Newly described species in this study are highlighted in blue." figureDoi="10.3897/zookeys.1142.90097.figure3" httpUri="https://binary.pensoft.net/fig/799861" pageId="0" pageNumber="1">3</figureCitation>
). We assign them as conspecific due to the indistinguishable shell form and breathing device and their geographical proximity in eastern Thailand. Therefore, more effort should be paid to additional molecular markers, and morphometric analyses are required to determine whether these distinct subclades should be recognised as a distinct taxon.
</paragraph>
</subSubSection>