treatments-xml/data/77/45/27/774527B90C865E818E17247D28CCB98F.xml

<document ID-DOI="http://dx.doi.org/10.3897/zookeys.1142.90097" ID-Pensoft-Pub="1313-2970-1142-1" ID-Pensoft-UUID="1D4BDF04F72B59B9984E00D0B4FB338D" ID-ZooBank="A1129EE50F9941CFB73AE771B66E2486" ModsDocID="1313-2970-1142-1" checkinTime="1674655519517" checkinUser="pensoft" docAuthor="Tongkerd, Piyoros, Tumpeesuwan, Sakboworn, Inkhavilay, Khamla, Prasankok, Pongpun, Jeratthitikul, Ekgachai, Panha, Somsak &amp; Sutcharit, Chirasak" docDate="2023" docId="774527B90C865E818E17247D28CCB98F" docLanguage="en" docName="ZooKeys 1142: 1-144" docOrigin="ZooKeys 1142" docPubDate="2023-01-24" docSource="http://dx.doi.org/10.3897/zookeys.1142.90097" docTitle="Rhiostoma laosense Tongkerd &amp; Inkhavilay 2023, sp. nov." docType="treatment" docUuid="9944EEE3-46DD-42F7-AB77-AF9000C45D57" docUuidSource="ZooBank" docVersion="1" id="1D4BDF04F72B59B9984E00D0B4FB338D" lastPageNumber="1" masterDocId="1D4BDF04F72B59B9984E00D0B4FB338D" masterDocTitle="Systematic revision of the snorkel snail genus Rhiostoma Benson, 1860 (Gastropoda, Caenogastropoda, Cyclophoridae) with descriptions of new species" masterLastPageNumber="144" masterPageNumber="1" pageNumber="1" updateTime="1674655519517" updateUser="pensoft">
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<mods:titleInfo>
<mods:title>Systematic revision of the snorkel snail genus Rhiostoma Benson, 1860 (Gastropoda, Caenogastropoda, Cyclophoridae) with descriptions of new species</mods:title>
</mods:titleInfo>
<mods:name type="personal">
<mods:role>
<mods:roleTerm>Author</mods:roleTerm>
</mods:role>
<mods:namePart>Tongkerd, Piyoros</mods:namePart>
<mods:affiliation>Animal Systematics Research Unit, Department of Biology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand</mods:affiliation>
</mods:name>
<mods:name type="personal">
<mods:role>
<mods:roleTerm>Author</mods:roleTerm>
</mods:role>
<mods:namePart>Tumpeesuwan, Sakboworn</mods:namePart>
<mods:affiliation>Animal Systematics Research Unit, Department of Biology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand &amp; Present address: Department of Biology, Faculty of Science, Mahasarakham University, Kantharawichai, Maha Sarakham 44150 Thailand</mods:affiliation>
</mods:name>
<mods:name type="personal">
<mods:role>
<mods:roleTerm>Author</mods:roleTerm>
</mods:role>
<mods:namePart>Inkhavilay, Khamla</mods:namePart>
<mods:affiliation>Department of Biology, Faculty of Natural Science, National University of Laos, P. O. Box 7322, Dongdok, Vientiane, Laos</mods:affiliation>
</mods:name>
<mods:name type="personal">
<mods:role>
<mods:roleTerm>Author</mods:roleTerm>
</mods:role>
<mods:namePart>Prasankok, Pongpun</mods:namePart>
<mods:affiliation>School of Biology, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand</mods:affiliation>
</mods:name>
<mods:name type="personal">
<mods:role>
<mods:roleTerm>Author</mods:roleTerm>
</mods:role>
<mods:namePart>Jeratthitikul, Ekgachai</mods:namePart>
<mods:affiliation>Animal Systematics and Molecular Ecology Laboratory, Department of Biology, Faculty of Science, Mahidol University, Bangkok 10400, Thailand</mods:affiliation>
</mods:name>
<mods:name type="personal">
<mods:role>
<mods:roleTerm>Author</mods:roleTerm>
</mods:role>
<mods:namePart>Panha, Somsak</mods:namePart>
<mods:affiliation>Animal Systematics Research Unit, Department of Biology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand</mods:affiliation>
<mods:nameIdentifier type="email">somsak.pan@chula.ac.th</mods:nameIdentifier>
</mods:name>
<mods:name type="personal">
<mods:role>
<mods:roleTerm>Author</mods:roleTerm>
</mods:role>
<mods:namePart>Sutcharit, Chirasak</mods:namePart>
<mods:affiliation>Animal Systematics Research Unit, Department of Biology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand</mods:affiliation>
<mods:nameIdentifier type="email">jirasak4@yahoo.com</mods:nameIdentifier>
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<mods:titleInfo>
<mods:title>ZooKeys</mods:title>
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<mods:date>2023</mods:date>
<mods:detail type="pubDate">
<mods:number>2023-01-24</mods:number>
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<mods:detail type="volume">
<mods:number>1142</mods:number>
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<mods:start>1</mods:start>
<mods:end>144</mods:end>
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<mods:url>http://dx.doi.org/10.3897/zookeys.1142.90097</mods:url>
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<mods:classification>journal article</mods:classification>
<mods:identifier type="DOI">http://dx.doi.org/10.3897/zookeys.1142.90097</mods:identifier>
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<treatment LSID="urn:lsid:zoobank.org:act:9944EEE3-46DD-42F7-AB77-AF9000C45D57" httpUri="http://treatment.plazi.org/id/774527B90C865E818E17247D28CCB98F" lastPageNumber="1" pageId="0" pageNumber="1">
<subSubSection pageId="0" pageNumber="1" type="nomenclature">
<paragraph pageId="0" pageNumber="1">
27. 
<taxonomicName LSID="https://zoobank.org/9944EEE3-46DD-42F7-AB77-AF9000C45D57" authority="Tongkerd &amp; Inkhavilay" authorityName="Tongkerd &amp; Inkhavilay" authorityYear="2023" class="Gastropoda" family="Cyclophoridae" genus="Rhiostoma" higherTaxonomySource="treatment-meta" kingdom="Animalia" lsidName="Rhiostoma laosense" order="Architaenioglossa" pageId="0" pageNumber="1" phylum="Mollusca" rank="species" species="laosense" status="sp. nov.">Rhiostoma laosense Tongkerd &amp; Inkhavilay</taxonomicName>
<taxonomicNameLabel pageId="0" pageNumber="1">sp. nov.</taxonomicNameLabel>
</paragraph>
</subSubSection>
<subSubSection pageId="0" pageNumber="1" type="description">
<paragraph pageId="0" pageNumber="1">
<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">Figs 44</figureCitation>
<figureCitation captionStart="Figure 52" captionStartId="F52" captionText="Figure 52. Shell of Rhiostoma laosense sp. nov. A holotype CUMZ 10001 / 2 from Wat Pa Pha, Khamkeut, Borikhamxay, Laos B, C paratypes CUMZ 10001 / 3 from type locality D specimen CUMZ 4753 from Tam Mangkorn Cave, Lak Sao, Borikhamxay, Laos E, F specimens CUMZ 10205 from Tad Muang, Khamkeut, Borikhamxay, Laos." figureDoi="10.3897/zookeys.1142.90097.figure52" httpUri="https://binary.pensoft.net/fig/799910" pageId="0" pageNumber="1">, 52</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">, 53D</figureCitation>
</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>
CUMZ 10001/2 (W 28.7 mm, H 14.2; Fig. 
<figureCitation captionStart="Figure 52" captionStartId="F52" captionText="Figure 52. Shell of Rhiostoma laosense sp. nov. A holotype CUMZ 10001 / 2 from Wat Pa Pha, Khamkeut, Borikhamxay, Laos B, C paratypes CUMZ 10001 / 3 from type locality D specimen CUMZ 4753 from Tam Mangkorn Cave, Lak Sao, Borikhamxay, Laos E, F specimens CUMZ 10205 from Tad Muang, Khamkeut, Borikhamxay, Laos." figureDoi="10.3897/zookeys.1142.90097.figure52" httpUri="https://binary.pensoft.net/fig/799910" pageId="0" pageNumber="1">52A</figureCitation>
). 
<emphasis bold="true" italics="true" pageId="0" pageNumber="1">Paratypes</emphasis>
CUMZ 10001/1 (23 adults + 2 juveniles), CUMZ 10001/3 (2 shells; Fig. 
<figureCitation captionStart="Figure 52" captionStartId="F52" captionText="Figure 52. Shell of Rhiostoma laosense sp. nov. A holotype CUMZ 10001 / 2 from Wat Pa Pha, Khamkeut, Borikhamxay, Laos B, C paratypes CUMZ 10001 / 3 from type locality D specimen CUMZ 4753 from Tam Mangkorn Cave, Lak Sao, Borikhamxay, Laos E, F specimens CUMZ 10205 from Tad Muang, Khamkeut, Borikhamxay, Laos." figureDoi="10.3897/zookeys.1142.90097.figure52" httpUri="https://binary.pensoft.net/fig/799910" pageId="0" pageNumber="1">52B, C</figureCitation>
), NHMUK 20220448 (5 shells), and SMF 368683 (5 shells). All paratypes are from the type locality.
</paragraph>
<caption doi="10.3897/zookeys.1142.90097.figure52" httpUri="https://binary.pensoft.net/fig/799910" pageId="0" pageNumber="1" start="Figure 52" startId="F52">
<paragraph pageId="0" pageNumber="1">
<emphasis bold="true" pageId="0" pageNumber="1">Figure 52.</emphasis>
Shell of 
<taxonomicName authorityName="Tongkerd &amp; Inkhavilay" authorityYear="2023" class="Gastropoda" family="Cyclophoridae" genus="Rhiostoma" kingdom="Animalia" lsidName="Rhiostoma laosense" order="Architaenioglossa" pageId="0" pageNumber="1" phylum="Mollusca" rank="species" species="laosense">
<emphasis italics="true" pageId="0" pageNumber="1">Rhiostoma laosense</emphasis>
</taxonomicName>
sp. nov. 
<emphasis bold="true" pageId="0" pageNumber="1">A</emphasis>
holotype CUMZ 10001/2 from Wat Pa Pha, Khamkeut, Borikhamxay, Laos 
<emphasis bold="true" pageId="0" pageNumber="1">B, C</emphasis>
paratypes CUMZ 10001/3 from type locality 
<emphasis bold="true" pageId="0" pageNumber="1">D</emphasis>
specimen CUMZ 4753 from Tam Mangkorn Cave, Lak Sao, Borikhamxay, Laos 
<emphasis bold="true" pageId="0" pageNumber="1">E, F</emphasis>
specimens CUMZ 10205 from Tad Muang, Khamkeut, Borikhamxay, Laos.
</paragraph>
</caption>
</subSubSection>
<subSubSection pageId="0" pageNumber="1" type="type locality">
<paragraph pageId="0" pageNumber="1">Type locality.</paragraph>
<paragraph pageId="0" pageNumber="1">
Wat Pa Pha, Khamkeut District, Borikhamxay Province, Laos (
<geoCoordinate degrees="18" direction="north" minutes="11" orientation="latitude" precision="1" seconds="17.3" value="18.188137">18°11'17.3&quot;N</geoCoordinate>
, 
<geoCoordinate degrees="104" direction="east" minutes="56" orientation="longitude" precision="1" seconds="26.2" value="104.94061">104°56'26.2&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="Laos" location="Hineboun District" municipality="Khamkeut District" specimenCount="1" stateProvince="Borikhamxay Province">
<emphasis bold="true" pageId="0" pageNumber="1">
<collectingCountry name="Laos">Laos</collectingCountry>
</emphasis>
: Tam Mangkorn (cave), 
<collectingMunicipality>Khamkeut District</collectingMunicipality>
, 
<collectingRegion country="Laos" name="Bolikhamxai">Borikhamxay Province</collectingRegion>
: CUMZ 4753 (2 shells; Fig. 
<figureCitation captionStart="Figure 52" captionStartId="F52" captionText="Figure 52. Shell of Rhiostoma laosense sp. nov. A holotype CUMZ 10001 / 2 from Wat Pa Pha, Khamkeut, Borikhamxay, Laos B, C paratypes CUMZ 10001 / 3 from type locality D specimen CUMZ 4753 from Tam Mangkorn Cave, Lak Sao, Borikhamxay, Laos E, F specimens CUMZ 10205 from Tad Muang, Khamkeut, Borikhamxay, Laos." figureDoi="10.3897/zookeys.1142.90097.figure52" httpUri="https://binary.pensoft.net/fig/799910" pageId="0" pageNumber="1">52D</figureCitation>
), 10005 (17 shells). Tad Muang, 
<location LSID="urn:lsid:plazi:treatment:774527B90C865E818E17247D28CCB98F:5C463B32DEA89F4428C3C28D2FF77635" country="Laos" municipality="Khamkeut District" name="Hineboun District" stateProvince="Borikhamxay Province">Hineboun District</location>
, 
<collectingRegion country="Laos" name="Khammouan">Khammouane Province</collectingRegion>
: CUMZ 10045 (33 shells), 10205 (2 shells; Figs 
<figureCitation captionStart="Figure 52" captionStartId="F52" captionText="Figure 52. Shell of Rhiostoma laosense sp. nov. A holotype CUMZ 10001 / 2 from Wat Pa Pha, Khamkeut, Borikhamxay, Laos B, C paratypes CUMZ 10001 / 3 from type locality D specimen CUMZ 4753 from Tam Mangkorn Cave, Lak Sao, Borikhamxay, Laos E, F specimens CUMZ 10205 from Tad Muang, Khamkeut, Borikhamxay, Laos." figureDoi="10.3897/zookeys.1142.90097.figure52" httpUri="https://binary.pensoft.net/fig/799910" pageId="0" pageNumber="1">52E, F</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">53D</figureCitation>
)
</materialsCitation>
.
</paragraph>
<caption doi="10.3897/zookeys.1142.90097.figure53" httpUri="https://binary.pensoft.net/fig/799911" pageId="0" pageNumber="1" start="Figure 53" startId="F53">
<paragraph pageId="0" pageNumber="1">
<emphasis bold="true" pageId="0" pageNumber="1">Figure 53.</emphasis>
Radula morphology 
<emphasis bold="true" pageId="0" pageNumber="1">A</emphasis>
<taxonomicName baseAuthorityName="Morelet" baseAuthorityYear="1875" class="Gastropoda" family="Cyclophoridae" genus="Rhiostoma" kingdom="Animalia" lsidName="Rhiostoma cambodjense" order="Architaenioglossa" pageId="0" pageNumber="1" phylum="Mollusca" rank="species" species="cambodjense">
<emphasis italics="true" pageId="0" pageNumber="1">Rhiostoma cambodjense</emphasis>
</taxonomicName>
, specimens CUMZ 4714 from Khao Chakan, Srakeo 
<emphasis bold="true" pageId="0" pageNumber="1">B</emphasis>
<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>
sp. nov., 
<typeStatus>paratype</typeStatus>
CUMZ CUMZ 3985/2 Tham Takien, Khao Chamao, Rayong 
<emphasis bold="true" pageId="0" pageNumber="1">C</emphasis>
<taxonomicName authorityName="Tongkerd &amp; Panha" authorityYear="2023" class="Gastropoda" family="Cyclophoridae" genus="Rhiostoma" kingdom="Animalia" lsidName="Rhiostoma gnomus" order="Architaenioglossa" pageId="0" pageNumber="1" phylum="Mollusca" rank="species" species="gnomus">
<emphasis italics="true" pageId="0" pageNumber="1">Rhiostoma gnomus</emphasis>
</taxonomicName>
sp. nov. 
<typeStatus>paratype</typeStatus>
CUMZ 4717 from Pha Chu, Na Noi, Nan 
<emphasis bold="true" pageId="0" pageNumber="1">D</emphasis>
<taxonomicName authorityName="Tongkerd &amp; Inkhavilay" authorityYear="2023" class="Gastropoda" family="Cyclophoridae" genus="Rhiostoma" kingdom="Animalia" lsidName="Rhiostoma laosense" order="Architaenioglossa" pageId="0" pageNumber="1" phylum="Mollusca" rank="species" species="laosense">
<emphasis italics="true" pageId="0" pageNumber="1">Rhiostoma laosense</emphasis>
</taxonomicName>
sp. nov. specimen CUMZ 10205 from Tad Muang, 
<collectingRegion country="Laos" name="Khammouan">Khammouane</collectingRegion>
, 
<collectingCountry name="Laos">Laos</collectingCountry>
.
</paragraph>
</caption>
</subSubSection>
<subSubSection pageId="0" pageNumber="1" type="diagnosis">
<paragraph pageId="0" pageNumber="1">Diagnosis.</paragraph>
<paragraph pageId="0" pageNumber="1">Shell large, depressed, and without detached whorl. Breathing device canal-shaped, pointed anteriorly, and attached to preceding whorl. Peristome double; outer lip with wide canal; inner lip continuous without incision. Operculum calcareous, cup-shaped, and densely lamellate.</paragraph>
</subSubSection>
<subSubSection pageId="0" pageNumber="1" type="differential diagnosis">
<paragraph pageId="0" pageNumber="1">Differential diagnosis.</paragraph>
<paragraph pageId="0" pageNumber="1">
This new species is superficially similar to 
<taxonomicName lsidName="R. morleti" pageId="0" pageNumber="1" rank="species" species="morleti">
<emphasis italics="true" pageId="0" pageNumber="1">R. morleti</emphasis>
</taxonomicName>
and 
<taxonomicName lsidName="R. prestoni" pageId="0" pageNumber="1" rank="species" species="prestoni">
<emphasis italics="true" pageId="0" pageNumber="1">R. prestoni</emphasis>
</taxonomicName>
; the distinguishing characters are the canal-shaped breathing device with outer lip expanded at the base and inner lip continuous without incision, and the operculum with dense lamellae. In contrast, 
<taxonomicName lsidName="R. morleti" pageId="0" pageNumber="1" rank="species" species="morleti">
<emphasis italics="true" pageId="0" pageNumber="1">R. morleti</emphasis>
</taxonomicName>
has an incomplete tube or canal-shaped breathing device with outer lip forming a canal or nearly closed tube, inner lip with shallow incision or a small hole, and operculum with loose lamellae. In addition, 
<taxonomicName lsidName="R. prestoni" pageId="0" pageNumber="1" rank="species" species="prestoni">
<emphasis italics="true" pageId="0" pageNumber="1">R. prestoni</emphasis>
</taxonomicName>
has a canal-shaped breathing device with a wide and shallow incision on the inner lip.
</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>
.
</emphasis>
Shell large, width 26.7-31.0 mm, height 12.3-15.9 mm, thickened, and flattened to sub-discoidal shape. Apex acute with dark colouration; spire flat. Whorls 4 to 5, convex, increasing regularly; suture wide and deep; last whorl rounded and stout. Shell surface with fine growth lines. Periostracum thin or thick, corneous, dark brown. Shell colour uniformly reddish brown to dark brownish irregular patterns; wide and dark spiral band on periphery. Detached whorl absent. Peristome circular and double; lip thickened, expanded, and multi-layered. Aperture opened sub-laterally. Breathing device canal-shaped, attached to preceding whorl and protruding anteriorly; outer lip protruding, with expanded base and wide canal; inner lip continuous without incision at base of breathing device. Umbilicus widely opened and deep. Operculum calcareous, cup-shaped, and multispiral with dense lamellae (Fig. 
<figureCitation captionStart="Figure 52" captionStartId="F52" captionText="Figure 52. Shell of Rhiostoma laosense sp. nov. A holotype CUMZ 10001 / 2 from Wat Pa Pha, Khamkeut, Borikhamxay, Laos B, C paratypes CUMZ 10001 / 3 from type locality D specimen CUMZ 4753 from Tam Mangkorn Cave, Lak Sao, Borikhamxay, Laos E, F specimens CUMZ 10205 from Tad Muang, Khamkeut, Borikhamxay, Laos." figureDoi="10.3897/zookeys.1142.90097.figure52" httpUri="https://binary.pensoft.net/fig/799910" pageId="0" pageNumber="1">52</figureCitation>
).
</paragraph>
<paragraph pageId="0" pageNumber="1">
<emphasis bold="true" pageId="0" pageNumber="1">
<emphasis italics="true" pageId="0" pageNumber="1">Radula</emphasis>
.
</emphasis>
Teeth arrangement and shape are very 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>
. Central tooth with five cusps; central cusp with similar shape and nearly equal size with two lateral cusps on each side. Lateral teeth are composed of three dull cusps. Marginal teeth each composed of three 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">53D</figureCitation>
).
</paragraph>
</subSubSection>
<subSubSection pageId="0" pageNumber="1" type="etymology">
<paragraph pageId="0" pageNumber="1">Etymology.</paragraph>
<paragraph pageId="0" pageNumber="1">
The species name 
<emphasis italics="true" pageId="0" pageNumber="1">laosense</emphasis>
is derived from the type locality Laos, where the type specimen was collected.
</paragraph>
</subSubSection>
<subSubSection pageId="0" pageNumber="1" type="distribution">
<paragraph pageId="0" pageNumber="1">Distribution.</paragraph>
<paragraph pageId="0" pageNumber="1">
This new species is known from multiple localities on the massive limestone karsts in Borikhamxay and Khammouane provinces, southern Laos (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>
).
</paragraph>
</subSubSection>
<subSubSection pageId="0" pageNumber="1" type="remarks">
<paragraph pageId="0" pageNumber="1">Remarks.</paragraph>
<paragraph pageId="0" pageNumber="1">
No live specimens of this species were found during our surveys. The record from Laos in 
<bibRefCitation DOI="https://doi.org/10.3897/zookeys.834.28800" author="Inkhavilay, K" journalOrPublisher="ZooKeys" pageId="0" pageNumber="1" pagination="1 - 166" refId="B65" refString="Inkhavilay, K, Sutcharit, C, Bantaowong, U, Chanabun, R, Siriwut, W, Srisonchai, R, Pholyotha, A, Jirapatrasilp, P, Panha, S, 2019. Annotated checklist of the terrestrial molluscs from Laos (Mollusca, Gastropoda). ZooKeys 834: 1 - 166, DOI: https://doi.org/10.3897/zookeys.834.28800" title="Annotated checklist of the terrestrial molluscs from Laos (Mollusca, Gastropoda)." url="https://doi.org/10.3897/zookeys.834.28800" volume="834" year="2019">Inkhavilay et al. (2019)</bibRefCitation>
as &quot; 
<taxonomicName authorityName="Dautzenberg &amp; Fischer" authorityYear="1906" class="Gastropoda" family="Cyclophoridae" genus="Rhiostoma" kingdom="Animalia" lsidName="Rhiostoma morleti" order="Architaenioglossa" pageId="0" pageNumber="1" phylum="Mollusca" rank="species" species="morleti">
<emphasis italics="true" pageId="0" pageNumber="1">Rhiostoma morleti</emphasis>
</taxonomicName>
Dautzenberg &amp; Fischer, 1906&quot; should be referred to as this new species based on a unique canal-shaped breathing device protruding anteriorly.
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