treatments-xml/data/03/B0/87/03B087C8071944193ACF1DA7D861CAA8.xml

<document ID-DOI="10.11646/zootaxa.5257.1.6" ID-GBIF-Dataset="f96f439c-8ba0-4645-ac22-ce46b40aabae" ID-ISSN="1175-5326" ID-Zenodo-Dep="7765939" ID-ZooBank="E18CE51E-CCD2-4E12-B480-930C79D8B745" checkinTime="1679644040936" checkinUser="plazi" docAuthor="Chen, Hui-Ming, Zheng, Chang-Bin &amp; Jiang, Xuan-Kong" docDate="2023" docId="03B087C8071944193ACF1DA7D861CAA8" docLanguage="en" docName="zootaxa.5257.1.6.pdf" docOrigin="Zootaxa 5257 (1)" docSource="http://dx.doi.org/10.11646/zootaxa.5257.1.6" docStyle="DocumentStyle:647186512141C8FC8976D5BCC54AEB7D.9:Zootaxa.2013-.journal_article" docStyleId="647186512141C8FC8976D5BCC54AEB7D" docStyleName="Zootaxa.2013-.journal_article" docStyleVersion="9" docTitle="Riukiaria spina Chen &amp; Zheng &amp; Jiang 2023, sp. nov." docType="treatment" docVersion="2" lastPageNumber="80" masterDocId="FF89FFB0070544063A581B4CDD5FCA51" masterDocTitle="The millipedes (Diplopoda) in Yintiaoling National Natural Reserve, Southwest China" masterLastPageNumber="81" masterPageNumber="49" pageNumber="77" updateTime="1679644761978" updateUser="ExternalLinkService" zenodo-license-document="CLOSED">
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<mods:title>The millipedes (Diplopoda) in Yintiaoling National Natural Reserve, Southwest China</mods:title>
</mods:titleInfo>
<mods:name type="personal">
<mods:role>
<mods:roleTerm>Author</mods:roleTerm>
</mods:role>
<mods:namePart>Chen, Hui-Ming</mods:namePart>
<mods:nameIdentifier type="ORCID">0000-0002-2449-3036</mods:nameIdentifier>
<mods:affiliation>Institute of Biology, Guizhou Academy of Sciences, Guiyang 550009, China &amp; mei 0601 @ 126. com; https: // orcid. org / 0000 - 0002 - 2449 - 3036</mods:affiliation>
</mods:name>
<mods:name type="personal">
<mods:role>
<mods:roleTerm>Author</mods:roleTerm>
</mods:role>
<mods:namePart>Zheng, Chang-Bin</mods:namePart>
<mods:nameIdentifier type="ORCID">0000-0002-2044-5096</mods:nameIdentifier>
<mods:affiliation>Management Center of Yintiaoling National Nature Reserve, Chongqing 405800, China &amp; 552151709 @ qq. com; https: // orcid. org / 0000 - 0002 - 2044 - 5096</mods:affiliation>
<mods:nameIdentifier type="email">552151709@qq.com</mods:nameIdentifier>
</mods:name>
<mods:name type="personal">
<mods:role>
<mods:roleTerm>Author</mods:roleTerm>
</mods:role>
<mods:namePart>Jiang, Xuan-Kong</mods:namePart>
<mods:nameIdentifier type="ORCID">0000-0003-3506-5894</mods:nameIdentifier>
<mods:affiliation>Institute of Biology, Guizhou Academy of Sciences, Guiyang 550009, China &amp; antoma 93 @ gmail. com; https: // orcid. org / 0000 - 0003 - 3506 - 5894</mods:affiliation>
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<mods:title>Zootaxa</mods:title>
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<mods:date>2023</mods:date>
<mods:detail type="pubDate">
<mods:number>2023-03-24</mods:number>
</mods:detail>
<mods:detail type="volume">
<mods:number>5257</mods:number>
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<mods:detail type="issue">
<mods:number>1</mods:number>
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<mods:identifier type="DOI">10.11646/zootaxa.5257.1.6</mods:identifier>
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<mods:identifier type="ISSN">1175-5326</mods:identifier>
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<mods:identifier type="ZooBank">E18CE51E-CCD2-4E12-B480-930C79D8B745</mods:identifier>
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<treatment ID-DOI="http://doi.org/10.5281/zenodo.7765955" ID-Zenodo-Dep="7765955" LSID="urn:lsid:plazi:treatment:03B087C8071944193ACF1DA7D861CAA8" httpUri="http://treatment.plazi.org/id/03B087C8071944193ACF1DA7D861CAA8" lastPageId="31" lastPageNumber="80" pageId="28" pageNumber="77">
<subSubSection box="[151,440,1771,1798]" pageId="28" pageNumber="77" type="nomenclature">
<paragraph blockId="28.[151,440,1771,1834]" box="[151,440,1771,1798]" pageId="28" pageNumber="77">
<heading bold="true" box="[151,440,1771,1798]" fontSize="11" level="1" pageId="28" pageNumber="77" reason="1">
<emphasis bold="true" box="[151,440,1771,1798]" pageId="28" pageNumber="77">
<taxonomicName authority="Chen &amp; Zheng &amp; Jiang, 2023" authorityName="Chen &amp; Zheng &amp; Jiang" authorityYear="2023" box="[151,339,1771,1798]" class="Diplopoda" family="Xystodesmidae" genus="Riukiaria" kingdom="Animalia" order="Polydesmida" pageId="28" pageNumber="77" phylum="Arthropoda" rank="species" species="spina" status="sp. nov.">
<emphasis bold="true" box="[151,339,1771,1798]" italics="true" pageId="28" pageNumber="77">Riukiaria spina</emphasis>
</taxonomicName>
<taxonomicNameLabel box="[347,440,1771,1797]" pageId="28" pageNumber="77" rank="species">sp. nov.</taxonomicNameLabel>
</emphasis>
</heading>
</paragraph>
</subSubSection>
<subSubSection box="[151,277,1807,1834]" pageId="28" pageNumber="77" type="description">
<paragraph blockId="28.[151,440,1771,1834]" box="[151,277,1807,1834]" pageId="28" pageNumber="77">
<figureCitation box="[151,277,1807,1834]" captionStart-0="FIGURE 35" captionStart-1="FIGURE 36" captionStart-2="FIGURE 37" captionStartId-0="29.[151,250,1301,1325]" captionStartId-1="30.[151,250,1224,1248]" captionStartId-2="30.[151,250,1933,1957]" captionTargetBox-0="[151,1435,417,1276]" captionTargetBox-1="[151,1435,309,1198]" captionTargetBox-2="[175,1400,1344,1893]" captionTargetId-0="figure-106@29.[151,1435,417,1277]" captionTargetId-1="figure-68@30.[151,1435,309,1201]" captionTargetId-2="figure-123@30.[151,1436,1344,1910]" captionTargetPageId-0="29" captionTargetPageId-1="30" captionTargetPageId-2="30" captionText-0="FIGURE 35. Live specimen of Riukiaria spina sp. nov. A. In visible light; B. In UV-light." captionText-1="FIGURE 36. Riukiaria spina sp. nov., holotype. A. Left gonopod, lateral view; B. Left gonopod, ventral view; C. Left gonopod, mesal view; D. Sternum, coxa, and prefemur of 2nd legpair, posterior view; E. Midbody leg, anterior view. Scale bars: A−C = 0.75 mm; D = 0.5 mm; E = 1 mm." captionText-2="FIGURE 37. Riukiaria spina sp. nov., holotype. A. Left gonopod, lateral view; B. Left gonopod, ventral view; C. Left gonopod, mesal view; D. Sternum, coxa, and prefemur of 2nd legpair, posterior view; E. Midbody leg, anterior view. Scale bars: A−C = 0.75 mm; D = 0.5 mm; E = 1 mm. Abbreviations: c, coxa; pfp, prefemoral process; sl, solenomere." figureDoi-0="http://doi.org/10.5281/zenodo.7766041" figureDoi-1="http://doi.org/10.5281/zenodo.7766043" figureDoi-2="http://doi.org/10.5281/zenodo.7766045" httpUri-0="https://zenodo.org/record/7766041/files/figure.png" httpUri-1="https://zenodo.org/record/7766043/files/figure.png" httpUri-2="https://zenodo.org/record/7766045/files/figure.png" pageId="28" pageNumber="77">Figs 35–37</figureCitation>
</paragraph>
</subSubSection>
<subSubSection pageId="28" pageNumber="77" type="materials_examined">
<paragraph blockId="28.[151,1436,1879,2014]" pageId="28" pageNumber="77">
<emphasis bold="true" box="[151,336,1879,1905]" pageId="28" pageNumber="77">Type materials.</emphasis>
<materialsCitation collectingDate="2022-08-17" collectorName="X. K. Jiang &amp; H. M. Chen" country="China" county="Wuxi County" elevation="1680" latitude="31.472076" location="Linkouzi" longLatPrecision="1" longitude="109.88287" municipality="Yintiaoling National Nature Reserve" pageId="28" pageNumber="77" specimenCount="1" stateProvince="Chongqing" typeStatus="holotype">
<emphasis bold="true" box="[342,451,1879,1905]" pageId="28" pageNumber="77">
<typeStatus box="[342,451,1879,1905]" pageId="28" pageNumber="77">Holotype</typeStatus>
</emphasis>
male: 
<collectingCountry box="[526,596,1879,1905]" name="China" pageId="28" pageNumber="77">China</collectingCountry>
, 
<collectingRegion box="[607,734,1879,1905]" country="China" name="Chongqing" pageId="28" pageNumber="77">Chongqing</collectingRegion>
, 
<collectingCounty box="[745,896,1879,1905]" pageId="28" pageNumber="77">Wuxi County</collectingCounty>
, 
<collectingMunicipality box="[906,1317,1879,1906]" pageId="28" pageNumber="77">Yintiaoling National Nature Reserve</collectingMunicipality>
, 
<location LSID="urn:lsid:plazi:treatment:03B087C8071944193ACF1DA7D861CAA8:8EC660050719441A3F681C1BD8C7CD20" box="[1328,1432,1879,1905]" country="China" county="Wuxi County" latitude="31.472076" longLatPrecision="1" longitude="109.88287" municipality="Yintiaoling National Nature Reserve" name="Linkouzi" pageId="28" pageNumber="77" stateProvince="Chongqing">Linkouzi</location>
, 
<geoCoordinate box="[151,333,1915,1942]" degrees="31" direction="north" minutes="28" orientation="latitude" pageId="28" pageNumber="77" precision="1" seconds="19.47" value="31.472076">31°28’19.47” N</geoCoordinate>
, 
<geoCoordinate box="[344,536,1915,1942]" degrees="109" direction="east" minutes="52" orientation="longitude" pageId="28" pageNumber="77" precision="1" seconds="58.34" value="109.88287">109°52’58.34” E</geoCoordinate>
, alt. 
<quantity box="[589,676,1915,1942]" metricMagnitude="3" metricUnit="m" metricValue="1.68" pageId="28" pageNumber="77" unit="m" value="1680.0">
<elevation box="[589,676,1915,1942]" metricMagnitude="3" metricUnit="m" metricValue="1.68" pageId="28" pageNumber="77" unit="m" value="1680.0">1680 m</elevation>
</quantity>
, 
<date box="[688,868,1915,1941]" pageId="28" pageNumber="77" value="2022-08-17">
<collectingDate box="[688,868,1915,1941]" pageId="28" pageNumber="77" value="2022-08-17">17 August 2022</collectingDate>
</date>
, 
<collectorName box="[879,999,1915,1942]" pageId="28" pageNumber="77">X.K. Jiang</collectorName>
&amp; 
<collectorName box="[1034,1159,1915,1942]" pageId="28" pageNumber="77">H.M. Chen</collectorName>
leg.
</materialsCitation>
<materialsCitation collectingDate="2022-08-17" collectorName="X. K. Jiang &amp; H. M. Chen" country="China" county="Wuxi County" elevation="1680" latitude="31.472076" location="Linkouzi" longLatPrecision="1" longitude="109.88287" municipality="Yintiaoling National Nature Reserve" pageId="28" pageNumber="77" specimenCount="3" specimenCount-female="1" specimenCount-male="2" stateProvince="Chongqing" typeStatus="paratype">
<emphasis bold="true" box="[1214,1343,1915,1941]" pageId="28" pageNumber="77">
<typeStatus box="[1214,1338,1915,1941]" pageId="28" pageNumber="77">Paratypes</typeStatus>
:
</emphasis>
<specimenCount box="[1350,1436,1915,1941]" pageId="28" pageNumber="77" type="male">2 males</specimenCount>
and 
<specimenCount box="[199,299,1951,1977]" pageId="28" pageNumber="77" type="female">1 female</specimenCount>
, same data as holotype
</materialsCitation>
.
</paragraph>
</subSubSection>
<subSubSection lastPageId="29" lastPageNumber="78" pageId="28" pageNumber="77" type="diagnosis">
<paragraph blockId="28.[151,1436,1879,2014]" lastBlockId="29.[151,1436,151,393]" lastPageId="29" lastPageNumber="78" pageId="28" pageNumber="77">
<emphasis bold="true" box="[199,322,1987,2013]" pageId="28" pageNumber="77">Diagnosis.</emphasis>
This species is very similar to 
<taxonomicName authority="Golovatch, 2014" authorityName="Golovatch" authorityYear="2014" box="[676,1010,1987,2013]" class="Diplopoda" family="Xystodesmidae" genus="Riukiaria" kingdom="Animalia" order="Polydesmida" pageId="28" pageNumber="77" phylum="Arthropoda" rank="species" species="davidiani">
<emphasis box="[676,814,1987,2013]" italics="true" pageId="28" pageNumber="77">R. davidiani</emphasis>
<bibRefCitation author="Golovatch, S. I." box="[822,1010,1987,2013]" pageId="28" pageNumber="77" pagination="188 - 200" refId="ref10119" refString="Golovatch, S. I. (2014) The millipede genus Riukiaria Attems, 1938 in continental China, with descriptions of new species (Diplopoda: Polydesmida: Xystodesmidae). Zootaxa, 3793 (1), 188 - 200. https: // doi. org / 10.11646 / zootaxa. 3793.1.9" type="journal article" year="2014">Golovatch, 2014</bibRefCitation>
</taxonomicName>
from 
<collectingRegion box="[1080,1170,1987,2013]" country="China" name="Sichuan" pageId="28" pageNumber="77">Sichuan</collectingRegion>
in the slender and bent prefemoral process and solenomere of the gonopods, but differs from the latter by the prefemoral process of the gonopods only slightly bending mesially (
<figureCitation box="[622,763,187,213]" captionStart="FIGURE 36" captionStartId="30.[151,250,1224,1248]" captionTargetBox="[151,1435,309,1198]" captionTargetId="figure-68@30.[151,1435,309,1201]" captionTargetPageId="30" captionText="FIGURE 36. Riukiaria spina sp. nov., holotype. A. Left gonopod, lateral view; B. Left gonopod, ventral view; C. Left gonopod, mesal view; D. Sternum, coxa, and prefemur of 2nd legpair, posterior view; E. Midbody leg, anterior view. Scale bars: A−C = 0.75 mm; D = 0.5 mm; E = 1 mm." figureDoi="http://doi.org/10.5281/zenodo.7766043" httpUri="https://zenodo.org/record/7766043/files/figure.png" pageId="29" pageNumber="78">Figs 36A–C</figureCitation>
, 
<figureCitation box="[773,855,187,213]" captionStart="FIGURE 37" captionStartId="30.[151,250,1933,1957]" captionTargetBox="[175,1400,1344,1893]" captionTargetId="figure-123@30.[151,1436,1344,1910]" captionTargetPageId="30" captionText="FIGURE 37. Riukiaria spina sp. nov., holotype. A. Left gonopod, lateral view; B. Left gonopod, ventral view; C. Left gonopod, mesal view; D. Sternum, coxa, and prefemur of 2nd legpair, posterior view; E. Midbody leg, anterior view. Scale bars: A−C = 0.75 mm; D = 0.5 mm; E = 1 mm. Abbreviations: c, coxa; pfp, prefemoral process; sl, solenomere." figureDoi="http://doi.org/10.5281/zenodo.7766045" httpUri="https://zenodo.org/record/7766045/files/figure.png" pageId="29" pageNumber="78">37A–C</figureCitation>
) not forming semicircle as in 
<taxonomicName authorityName="Golovatch" authorityYear="2014" box="[1192,1329,187,213]" class="Diplopoda" family="Xystodesmidae" genus="Riukiaria" kingdom="Animalia" order="Polydesmida" pageId="29" pageNumber="78" phylum="Arthropoda" rank="species" species="davidiani">
<emphasis box="[1192,1329,187,213]" italics="true" pageId="29" pageNumber="78">R. davidiani</emphasis>
</taxonomicName>
.
</paragraph>
</subSubSection>
<subSubSection pageId="29" pageNumber="78" type="etymology">
<paragraph blockId="29.[151,1436,151,393]" pageId="29" pageNumber="78">
<emphasis bold="true" box="[199,334,223,249]" pageId="29" pageNumber="78">Etymology.</emphasis>
The species name is derived from the shape of the prefemoral process of the gonopods, meaning ‘spine’, noun.
</paragraph>
</subSubSection>
<subSubSection lastPageId="30" lastPageNumber="79" pageId="29" pageNumber="78" type="description">
<paragraph blockId="29.[151,1436,151,393]" pageId="29" pageNumber="78">
<emphasis bold="true" box="[199,345,294,320]" pageId="29" pageNumber="78">Description.</emphasis>
Length ca. 
<quantity box="[484,609,294,321]" metricMagnitude="-2" metricUnit="m" metricValue="5.0" metricValueMax="5.2" metricValueMin="4.8" pageId="29" pageNumber="78" unit="mm" value="50.0" valueMax="52.0" valueMin="48.0">48–52 mm</quantity>
, midbody paranotal width 
<quantity box="[919,1072,295,321]" metricMagnitude="-2" metricUnit="m" metricValue="1.015" metricValueMax="1.06" metricValueMin="0.97" pageId="29" pageNumber="78" unit="mm" value="10.149999999999999" valueMax="10.6" valueMin="9.7">9.7–10.6 mm</quantity>
, metatergal length 
<quantity box="[1292,1432,295,321]" metricMagnitude="-3" metricUnit="m" metricValue="4.449999999999999" metricValueMax="4.8" metricValueMin="4.1" pageId="29" pageNumber="78" unit="mm" value="4.449999999999999" valueMax="4.8" valueMin="4.1">4.1–4.8 mm</quantity>
, collum width 
<quantity box="[308,446,330,357]" metricMagnitude="-3" metricUnit="m" metricValue="8.4" metricValueMax="8.5" metricValueMin="8.3" pageId="29" pageNumber="78" unit="mm" value="8.4" valueMax="8.5" valueMin="8.3">8.3–8.5 mm</quantity>
, length 
<quantity box="[536,675,331,357]" metricMagnitude="-3" metricUnit="m" metricValue="3.45" metricValueMax="3.6" metricValueMin="3.3" pageId="29" pageNumber="78" unit="mm" value="3.45" valueMax="3.6" valueMin="3.3">3.3–3.6 mm</quantity>
. Body uniformly light yellow (
<figureCitation box="[1026,1132,330,357]" captionStart="FIGURE 35" captionStartId="29.[151,250,1301,1325]" captionTargetBox="[151,1435,417,1276]" captionTargetId="figure-106@29.[151,1435,417,1277]" captionTargetPageId="29" captionText="FIGURE 35. Live specimen of Riukiaria spina sp. nov. A. In visible light; B. In UV-light." figureDoi="http://doi.org/10.5281/zenodo.7766041" httpUri="https://zenodo.org/record/7766041/files/figure.png" pageId="29" pageNumber="78">Fig. 35A</figureCitation>
). Fluorescence in UV light strong (
<figureCitation box="[236,340,366,393]" captionStart="FIGURE 35" captionStartId="29.[151,250,1301,1325]" captionTargetBox="[151,1435,417,1276]" captionTargetId="figure-106@29.[151,1435,417,1277]" captionTargetPageId="29" captionText="FIGURE 35. Live specimen of Riukiaria spina sp. nov. A. In visible light; B. In UV-light." figureDoi="http://doi.org/10.5281/zenodo.7766041" httpUri="https://zenodo.org/record/7766041/files/figure.png" pageId="29" pageNumber="78">Fig. 35B</figureCitation>
).
</paragraph>
<caption ID-DOI="http://doi.org/10.5281/zenodo.7766041" ID-Zenodo-Dep="7766041" box="[151,1072,1301,1325]" httpUri="https://zenodo.org/record/7766041/files/figure.png" pageId="29" pageNumber="78" startId="29.[151,250,1301,1325]" targetBox="[151,1435,417,1276]" targetPageId="29">
<paragraph blockId="29.[151,1072,1301,1325]" box="[151,1072,1301,1325]" pageId="29" pageNumber="78">
<emphasis bold="true" box="[151,288,1301,1325]" pageId="29" pageNumber="78">FIGURE 35.</emphasis>
Live specimen of 
<taxonomicName authority="Chen &amp; Zheng &amp; Jiang, 2023" authorityName="Chen &amp; Zheng &amp; Jiang" authorityYear="2023" box="[476,633,1301,1325]" class="Diplopoda" family="Xystodesmidae" genus="Riukiaria" kingdom="Animalia" order="Polydesmida" pageId="29" pageNumber="78" phylum="Arthropoda" rank="species" species="spina" status="sp. nov.">
<emphasis box="[476,633,1301,1325]" italics="true" pageId="29" pageNumber="78">Riukiaria spina</emphasis>
</taxonomicName>
<emphasis bold="true" box="[639,752,1301,1325]" pageId="29" pageNumber="78">
<taxonomicNameLabel box="[639,720,1301,1325]" pageId="29" pageNumber="78" rank="species">sp. nov.</taxonomicNameLabel>
A.
</emphasis>
In visible light; 
<emphasis bold="true" box="[919,942,1301,1325]" pageId="29" pageNumber="78">B.</emphasis>
In UV-light.
</paragraph>
</caption>
<paragraph blockId="29.[151,1437,1371,2010]" pageId="29" pageNumber="78">
Head smooth, epicranial suture distinct, several setae scattered above clypeus, with 2 dense rows at its margin and on labrum. Antennae slender. Antennomeres 1 and 7 short and small, slightly longer than wide. Antennomeres 2–6 clavate. Lengths of antennomeres: 6&gt;5≈4≈3≈2&gt;1&gt;7. Gnathochilarium densely setose. Collum convex, smooth, shiny, without marginal ridge, tapering laterally. Pro- and metaterga smooth without any traces of tubercles or punctuation, not even wrinkles (
<figureCitation box="[460,566,1515,1542]" captionStart="FIGURE 35" captionStartId="29.[151,250,1301,1325]" captionTargetBox="[151,1435,417,1276]" captionTargetId="figure-106@29.[151,1435,417,1277]" captionTargetPageId="29" captionText="FIGURE 35. Live specimen of Riukiaria spina sp. nov. A. In visible light; B. In UV-light." figureDoi="http://doi.org/10.5281/zenodo.7766041" httpUri="https://zenodo.org/record/7766041/files/figure.png" pageId="29" pageNumber="78">Fig. 35A</figureCitation>
). Posteriolateral edge of paranota strongly pointed caudad. Pore formula normal, pores on paranota 5,7,9,10,12,13,15,16,17, and 18, in median excavation of paranota (in lateral view). Epiproct in dorsal view subtriangular, in lateral view protruding over paraprocts, parallel-sided, slightly curved ventrad, with 7+7 setae, 3+3 of them sitting on knobs. Paraprocts strongly marginate with 2+2 setae, hypoproct with 1+1 setae on knobs. Midbody legs well separated, sterna wide and smooth. Postgonopodal legs (
<figureCitation box="[1068,1165,1659,1685]" captionStart="FIGURE 36" captionStartId="30.[151,250,1224,1248]" captionTargetBox="[151,1435,309,1198]" captionTargetId="figure-68@30.[151,1435,309,1201]" captionTargetPageId="30" captionText="FIGURE 36. Riukiaria spina sp. nov., holotype. A. Left gonopod, lateral view; B. Left gonopod, ventral view; C. Left gonopod, mesal view; D. Sternum, coxa, and prefemur of 2nd legpair, posterior view; E. Midbody leg, anterior view. Scale bars: A−C = 0.75 mm; D = 0.5 mm; E = 1 mm." figureDoi="http://doi.org/10.5281/zenodo.7766043" httpUri="https://zenodo.org/record/7766043/files/figure.png" pageId="29" pageNumber="78">Fig. 36E</figureCitation>
) with moderately developed ventral spine on prefemur, increasingly stronger towards body end. Femur as long as tarsus. Postfemur stout, about half-length of femur. Tibia straight, both subequal in length of postfemur. Tarsus slender. Claw curved.
</paragraph>
<paragraph blockId="29.[151,1437,1371,2010]" pageId="29" pageNumber="78">
Male 2nd leg pair coxa with strong median projections about half as long as length of coxa, densely setose, without membraneous tubules apically (
<figureCitation box="[607,713,1803,1829]" captionStart="FIGURE 36" captionStartId="30.[151,250,1224,1248]" captionTargetBox="[151,1435,309,1198]" captionTargetId="figure-68@30.[151,1435,309,1201]" captionTargetPageId="30" captionText="FIGURE 36. Riukiaria spina sp. nov., holotype. A. Left gonopod, lateral view; B. Left gonopod, ventral view; C. Left gonopod, mesal view; D. Sternum, coxa, and prefemur of 2nd legpair, posterior view; E. Midbody leg, anterior view. Scale bars: A−C = 0.75 mm; D = 0.5 mm; E = 1 mm." figureDoi="http://doi.org/10.5281/zenodo.7766043" httpUri="https://zenodo.org/record/7766043/files/figure.png" pageId="29" pageNumber="78">Fig. 36D</figureCitation>
). Male gonopodal aperture on segment 7 wide, elliptical, about twice as wide as long, gonopods in situ usually deeply embedded, with acropodites crossing each other.
</paragraph>
<paragraph blockId="29.[151,1437,1371,2010]" lastBlockId="30.[151,1436,151,285]" lastPageId="30" lastPageNumber="79" pageId="29" pageNumber="78">
Coxa of gonopod (
<figureCitation box="[410,551,1875,1901]" captionStart="FIGURE 36" captionStartId="30.[151,250,1224,1248]" captionTargetBox="[151,1435,309,1198]" captionTargetId="figure-68@30.[151,1435,309,1201]" captionTargetPageId="30" captionText="FIGURE 36. Riukiaria spina sp. nov., holotype. A. Left gonopod, lateral view; B. Left gonopod, ventral view; C. Left gonopod, mesal view; D. Sternum, coxa, and prefemur of 2nd legpair, posterior view; E. Midbody leg, anterior view. Scale bars: A−C = 0.75 mm; D = 0.5 mm; E = 1 mm." figureDoi="http://doi.org/10.5281/zenodo.7766043" httpUri="https://zenodo.org/record/7766043/files/figure.png" pageId="29" pageNumber="78">Figs 36A–C</figureCitation>
, 
<figureCitation box="[562,591,1876,1902]" captionStart="FIGURE 37" captionStartId="30.[151,250,1933,1957]" captionTargetBox="[175,1400,1344,1893]" captionTargetId="figure-123@30.[151,1436,1344,1910]" captionTargetPageId="30" captionText="FIGURE 37. Riukiaria spina sp. nov., holotype. A. Left gonopod, lateral view; B. Left gonopod, ventral view; C. Left gonopod, mesal view; D. Sternum, coxa, and prefemur of 2nd legpair, posterior view; E. Midbody leg, anterior view. Scale bars: A−C = 0.75 mm; D = 0.5 mm; E = 1 mm. Abbreviations: c, coxa; pfp, prefemoral process; sl, solenomere." figureDoi="http://doi.org/10.5281/zenodo.7766045" httpUri="https://zenodo.org/record/7766045/files/figure.png" pageId="29" pageNumber="78">37</figureCitation>
) stout, approximately as long as wide, glabrous, without proximal apophysis. Cannula normal, situated on mesal side (
<figureCitation box="[658,800,1911,1938]" captionStart="FIGURE 36" captionStartId="30.[151,250,1224,1248]" captionTargetBox="[151,1435,309,1198]" captionTargetId="figure-68@30.[151,1435,309,1201]" captionTargetPageId="30" captionText="FIGURE 36. Riukiaria spina sp. nov., holotype. A. Left gonopod, lateral view; B. Left gonopod, ventral view; C. Left gonopod, mesal view; D. Sternum, coxa, and prefemur of 2nd legpair, posterior view; E. Midbody leg, anterior view. Scale bars: A−C = 0.75 mm; D = 0.5 mm; E = 1 mm." figureDoi="http://doi.org/10.5281/zenodo.7766043" httpUri="https://zenodo.org/record/7766043/files/figure.png" pageId="29" pageNumber="78">Figs 36B, C</figureCitation>
; 
<figureCitation box="[813,897,1912,1938]" captionStart="FIGURE 37" captionStartId="30.[151,250,1933,1957]" captionTargetBox="[175,1400,1344,1893]" captionTargetId="figure-123@30.[151,1436,1344,1910]" captionTargetPageId="30" captionText="FIGURE 37. Riukiaria spina sp. nov., holotype. A. Left gonopod, lateral view; B. Left gonopod, ventral view; C. Left gonopod, mesal view; D. Sternum, coxa, and prefemur of 2nd legpair, posterior view; E. Midbody leg, anterior view. Scale bars: A−C = 0.75 mm; D = 0.5 mm; E = 1 mm. Abbreviations: c, coxa; pfp, prefemoral process; sl, solenomere." figureDoi="http://doi.org/10.5281/zenodo.7766045" httpUri="https://zenodo.org/record/7766045/files/figure.png" pageId="29" pageNumber="78">37B, C</figureCitation>
). Telopodite consists of two slender and simple processes, prefemoral process and acropodite (solenomere), typical for 
<taxonomicName box="[962,1068,1947,1973]" class="Diplopoda" family="Xystodesmidae" genus="Riukiaria" kingdom="Animalia" order="Polydesmida" pageId="29" pageNumber="78" phylum="Arthropoda" rank="genus">
<emphasis box="[962,1068,1947,1973]" italics="true" pageId="29" pageNumber="78">Riukiaria</emphasis>
</taxonomicName>
. Prefemur densely covered with long hairs. Base of prefemoral process developed, originated from the base of prefemur. Prefemoral process extremely slender, spine-like bending mesially, as long as acropodite, with no setae, hairs, or processes. Acropodite long, scythe-shaped with a sharp tip, arched proximally towards prefemoral process. Prostatic groove running along mesal side, and ending on the pointed tip (
<figureCitation box="[625,729,223,249]" captionStart="FIGURE 37" captionStartId="30.[151,250,1933,1957]" captionTargetBox="[175,1400,1344,1893]" captionTargetId="figure-123@30.[151,1436,1344,1910]" captionTargetPageId="30" captionText="FIGURE 37. Riukiaria spina sp. nov., holotype. A. Left gonopod, lateral view; B. Left gonopod, ventral view; C. Left gonopod, mesal view; D. Sternum, coxa, and prefemur of 2nd legpair, posterior view; E. Midbody leg, anterior view. Scale bars: A−C = 0.75 mm; D = 0.5 mm; E = 1 mm. Abbreviations: c, coxa; pfp, prefemoral process; sl, solenomere." figureDoi="http://doi.org/10.5281/zenodo.7766045" httpUri="https://zenodo.org/record/7766045/files/figure.png" pageId="30" pageNumber="79">Fig. 37B</figureCitation>
).
</paragraph>
</subSubSection>
<subSubSection box="[199,753,258,285]" pageId="30" pageNumber="79" type="distribution">
<paragraph blockId="30.[151,1436,151,285]" box="[199,753,258,285]" pageId="30" pageNumber="79">
<emphasis bold="true" box="[199,353,258,284]" pageId="30" pageNumber="79">Distribution.</emphasis>
Known only from the 
<typeStatus box="[608,656,259,285]" pageId="30" pageNumber="79">type</typeStatus>
locality.
</paragraph>
</subSubSection>
<caption ID-DOI="http://doi.org/10.5281/zenodo.7766043" ID-Zenodo-Dep="7766043" httpUri="https://zenodo.org/record/7766043/files/figure.png" pageId="30" pageNumber="79" startId="30.[151,250,1224,1248]" targetBox="[151,1435,309,1198]" targetPageId="30">
<paragraph blockId="30.[151,1436,1224,1320]" pageId="30" pageNumber="79">
<emphasis bold="true" box="[151,287,1224,1248]" pageId="30" pageNumber="79">FIGURE 36.</emphasis>
<taxonomicName authority="Chen &amp; Zheng &amp; Jiang, 2023" authorityName="Chen &amp; Zheng &amp; Jiang" authorityYear="2023" box="[292,448,1224,1248]" class="Diplopoda" family="Xystodesmidae" genus="Riukiaria" kingdom="Animalia" order="Polydesmida" pageId="30" pageNumber="79" phylum="Arthropoda" rank="species" species="spina" status="sp. nov.">
<emphasis box="[292,448,1224,1248]" italics="true" pageId="30" pageNumber="79">Riukiaria spina</emphasis>
</taxonomicName>
<emphasis bold="true" box="[453,532,1224,1248]" pageId="30" pageNumber="79">
<taxonomicNameLabel box="[453,532,1224,1248]" pageId="30" pageNumber="79" rank="species">sp. nov.</taxonomicNameLabel>
</emphasis>
, holotype. 
<emphasis bold="true" box="[644,669,1224,1248]" pageId="30" pageNumber="79">A.</emphasis>
Left gonopod, lateral view; 
<emphasis bold="true" box="[951,974,1224,1248]" pageId="30" pageNumber="79">B.</emphasis>
Left gonopod, ventral view; 
<emphasis bold="true" box="[1264,1289,1224,1248]" pageId="30" pageNumber="79">C.</emphasis>
Left gonopod, mesal view; 
<emphasis bold="true" box="[279,304,1260,1284]" pageId="30" pageNumber="79">D.</emphasis>
Sternum, coxa, and prefemur of 2nd legpair, posterior view; 
<emphasis bold="true" box="[924,948,1260,1284]" pageId="30" pageNumber="79">E.</emphasis>
Midbody leg, anterior view. 
<emphasis bold="true" box="[1242,1361,1260,1284]" pageId="30" pageNumber="79">Scale bars:</emphasis>
A−C = 0.75 mm; D = 0.5 mm; E = 1 mm.
</paragraph>
</caption>
<caption ID-DOI="http://doi.org/10.5281/zenodo.7766045" ID-Zenodo-Dep="7766045" httpUri="https://zenodo.org/record/7766045/files/figure.png" pageId="30" pageNumber="79" startId="30.[151,250,1933,1957]" targetBox="[175,1400,1344,1893]" targetPageId="30">
<paragraph blockId="30.[151,1436,1933,2030]" pageId="30" pageNumber="79">
<emphasis bold="true" box="[151,287,1933,1958]" pageId="30" pageNumber="79">FIGURE 37.</emphasis>
<taxonomicName authority="Chen &amp; Zheng &amp; Jiang, 2023" authorityName="Chen &amp; Zheng &amp; Jiang" authorityYear="2023" box="[292,448,1934,1958]" class="Diplopoda" family="Xystodesmidae" genus="Riukiaria" kingdom="Animalia" order="Polydesmida" pageId="30" pageNumber="79" phylum="Arthropoda" rank="species" species="spina" status="sp. nov.">
<emphasis box="[292,448,1934,1958]" italics="true" pageId="30" pageNumber="79">Riukiaria spina</emphasis>
</taxonomicName>
<emphasis bold="true" box="[453,532,1934,1958]" pageId="30" pageNumber="79">
<taxonomicNameLabel box="[453,532,1934,1958]" pageId="30" pageNumber="79" rank="species">sp. nov.</taxonomicNameLabel>
</emphasis>
, holotype. 
<emphasis bold="true" box="[644,669,1933,1957]" pageId="30" pageNumber="79">A.</emphasis>
Left gonopod, lateral view; 
<emphasis bold="true" box="[951,974,1934,1958]" pageId="30" pageNumber="79">B.</emphasis>
Left gonopod, ventral view; 
<emphasis bold="true" box="[1264,1289,1933,1957]" pageId="30" pageNumber="79">C.</emphasis>
Left gonopod, mesal view; 
<emphasis bold="true" box="[279,304,1970,1994]" pageId="30" pageNumber="79">D.</emphasis>
Sternum, coxa, and prefemur of 2nd legpair, posterior view; 
<emphasis bold="true" box="[924,948,1970,1994]" pageId="30" pageNumber="79">E.</emphasis>
Midbody leg, anterior view. 
<emphasis bold="true" box="[1242,1361,1969,1994]" pageId="30" pageNumber="79">Scale bars:</emphasis>
A−C = 0.75 mm; D = 0.5 mm; E = 1 mm. 
<emphasis bold="true" box="[504,665,2005,2029]" pageId="30" pageNumber="79">Abbreviations:</emphasis>
c, coxa; pfp, prefemoral process; sl, solenomere.
</paragraph>
</caption>
<subSubSection pageId="31" pageNumber="80" type="discussion">
<paragraph blockId="31.[151,1437,151,249]" pageId="31" pageNumber="80">
<emphasis bold="true" box="[199,315,151,177]" pageId="31" pageNumber="80">Remarks.</emphasis>
<taxonomicName box="[322,428,151,177]" class="Diplopoda" family="Xystodesmidae" genus="Riukiaria" kingdom="Animalia" order="Polydesmida" pageId="31" pageNumber="80" phylum="Arthropoda" rank="genus">
<emphasis box="[322,428,151,177]" italics="true" pageId="31" pageNumber="80">Riukiaria</emphasis>
</taxonomicName>
contains 36 species distributed in 
<collectingCountry box="[814,881,151,177]" name="China" pageId="31" pageNumber="80">China</collectingCountry>
and 
<collectingCountry box="[936,1000,151,177]" name="Japan" pageId="31" pageNumber="80">Japan</collectingCountry>
(
<bibRefCitation author="Marek, P. E. &amp; Tanabe, T. &amp; Sierwald, P." box="[1014,1221,151,177]" pageId="31" pageNumber="80" pagination="1 - 117" refId="ref10805" refString="Marek, P. E., Tanabe, T. &amp; Sierwald, P. (2014) A species catalog of the millipede family Xystodesmidae. Virginia Museum of Natural History Publications, 17, 1 - 117." type="journal article" year="2014">
Marek 
<emphasis box="[1096,1146,151,177]" italics="true" pageId="31" pageNumber="80">et al</emphasis>
. 2014
</bibRefCitation>
). In 
<collectingCountry box="[1270,1340,151,177]" name="China" pageId="31" pageNumber="80">China</collectingCountry>
, thirteen species have been reported from 
<collectingRegion box="[524,614,187,213]" country="China" name="Shaanxi" pageId="31" pageNumber="80">Shaanxi</collectingRegion>
(1 species), 
<collectingRegion box="[758,848,187,213]" country="China" name="Sichuan" pageId="31" pageNumber="80">Sichuan</collectingRegion>
(2 species), 
<collectingRegion box="[992,1092,187,213]" country="China" name="Zhejiang" pageId="31" pageNumber="80">Zhejiang</collectingRegion>
(2 species), 
<collectingRegion box="[1236,1308,187,213]" country="China" name="Fujian" pageId="31" pageNumber="80">Fujian</collectingRegion>
(1 species) and 
<collectingCountry box="[198,280,223,249]" name="Taiwan" pageId="31" pageNumber="80">Taiwan</collectingCountry>
(7 species). 
<taxonomicName authority="Chen &amp; Zheng &amp; Jiang, 2023" authorityName="Chen &amp; Zheng &amp; Jiang" authorityYear="2023" box="[422,595,223,249]" class="Diplopoda" family="Xystodesmidae" genus="Riukiaria" kingdom="Animalia" order="Polydesmida" pageId="31" pageNumber="80" phylum="Arthropoda" rank="species" species="spina" status="sp. nov.">
<emphasis box="[422,595,223,249]" italics="true" pageId="31" pageNumber="80">Riukiaria spina</emphasis>
</taxonomicName>
<emphasis bold="true" box="[602,692,223,249]" pageId="31" pageNumber="80">
<taxonomicNameLabel box="[602,692,223,249]" pageId="31" pageNumber="80" rank="species">sp. nov.</taxonomicNameLabel>
</emphasis>
is the first species of 
<taxonomicName box="[936,1042,223,249]" class="Diplopoda" family="Xystodesmidae" genus="Riukiaria" kingdom="Animalia" order="Polydesmida" pageId="31" pageNumber="80" phylum="Arthropoda" rank="genus">
<emphasis box="[936,1042,223,249]" italics="true" pageId="31" pageNumber="80">Riukiaria</emphasis>
</taxonomicName>
reported from Chongqing.
</paragraph>
</subSubSection>
</treatment>
</document>