<documentID-CLB-Dataset="20043"ID-DOI="http://dx.doi.org/10.3897/zookeys.1091.79564"ID-GBIF-Dataset="64b1edd6-e277-4239-a230-3d87e367a13f"ID-PMC="PMC9005496"ID-Pensoft-Pub="1313-2970-1091-15"ID-Pensoft-UUID="441AFDF6A4B85C8198C4A84CBFDF0AA9"ID-PubMed="35586020"ID-ZooBank="BC5444151BC74724A186FB7ED12B0CAE"ModsDocID="1313-2970-1091-15"checkinTime="1648741050671"checkinUser="pensoft"docAuthor="Mai, Zuqi, Hu, Jian & Jia, Fenglong"docDate="2022"docId="A71FE8B189D159718CA38299629BD9EF"docLanguage="en"docName="ZooKeys 1091: 15-56"docOrigin="ZooKeys 1091"docPubDate="2022-03-31"docSource="http://dx.doi.org/10.3897/zookeys.1091.79564"docTitle="Coelostoma (Lachnocoelostoma) mixtum Mai & Jia 2022, sp. nov."docType="treatment"docUuid="DBD0A5A3-6C16-435E-B4EF-463D3632DF6F"docUuidSource="ZooBank"docVersion="6"id="441AFDF6A4B85C8198C4A84CBFDF0AA9"lastPageNumber="15"masterDocId="441AFDF6A4B85C8198C4A84CBFDF0AA9"masterDocTitle="Additional fauna of Coelostoma Brulle, 1835 from China, with re-establishment of Coelostoma sulcatum Pu, 1963 as a valid species (Coleoptera, Hydrophilidae, Sphaeridiinae)"masterLastPageNumber="56"masterPageNumber="15"pageNumber="15"updateTime="1732931225192"updateUser="ExternalLinkService">
<mods:titleid="1CFFC0BA4A84391AD10781895BE0B5D7">Additional fauna of Coelostoma Brulle, 1835 from China, with re-establishment of Coelostoma sulcatum Pu, 1963 as a valid species (Coleoptera, Hydrophilidae, Sphaeridiinae)</mods:title>
<mods:affiliationid="4D925DA7D44AE95B3D8EA6CFB7879A26">School of Agriculture, Sun Yat-sen University, Guangzhou, 511436, Guangdong, China</mods:affiliation>
<mods:affiliationid="CFB6C7AE562FA445F81DABC560747265">School of Agriculture, Sun Yat-sen University, Guangzhou, 511436, Guangdong, China</mods:affiliation>
<mods:affiliationid="22AF324B52B741096680257221C7C002">School of Agriculture, Sun Yat-sen University, Guangzhou, 511436, Guangdong, China & Institute of Entomology, Life Sciences School, Sun Yat-sen University, Guangzhou, 510275, Guangdong, China</mods:affiliation>
<taxonomicNameid="5164C699AE55442333E26B052792DA8D"ID-CoL="9GCT4"LSID="http://zoobank.org/DBD0A5A3-6C16-435E-B4EF-463D3632DF6F"authority="Mai & Jia"authorityName="Mai & Jia"authorityYear="2022"class="Insecta"family="Hydrophilidae"genus="Coelostoma"higherTaxonomySource="CoL"kingdom="Animalia"lsidName="Coelostoma (Lachnocoelostoma) mixtum"order="Coleoptera"pageId="0"pageNumber="15"phylum="Arthropoda"rank="species"species="mixtum"status="sp. nov."subGenus="Lachnocoelostoma">Coelostoma (Lachnocoelostoma) mixtum Mai & Jia</taxonomicName>
<figureCitationid="7C1706B5191BE25D1AE3B39F53CB88D4"captionStart="Figure 4"captionStartId="F4"captionText="Figure 4. Coelostoma (Lachnocoelostoma) mixtum Mai & Jia, sp. nov. A dorsal view B ventral view C lateral view. Scale bar: 1.0 mm (A-C)."figureDoi="10.3897/zookeys.1091.79564.figure4"httpUri="https://binary.pensoft.net/fig/666186"pageId="0"pageNumber="15">Figures 4A-C</figureCitation>
<figureCitationid="F310A5C19A9B929831A101F5327818A9"captionStart="Figure 5"captionStartId="F5"captionText="Figure 5. Aedeagus of Coelostoma mixtum Mai & Jia, sp. nov. and Coelostoma vagum Orchymont, 1940. A-C C. mixtum sp. nov. A dorsal view B lateral view C ventral view D-F C. vagum D dorsal view E lateral view F illustration by Orchymont (1940). Scale bar: 0.5 mm (A-E)."figureDoi="10.3897/zookeys.1091.79564.figure5"httpUri="https://binary.pensoft.net/fig/666187"pageId="0"pageNumber="15">, 5A-C</figureCitation>
Length 6.13 mm. Head, pronotum and elytra with similar punctation. Prosternum carinate medially, with a prominent tooth anteromedially. Elytra parallel-sided in the middle, without serial punctures laterally. Mesofemora densely pubescent, except on extreme apex. First abdominal ventrite with median carina on basal one-thirds. Fifth ventrite slightly emarginate and with a row of stout setae apically.
<figureCitationid="DA26F3E18D8801B7CC3403244E07FBA2"captionStart="Figure 5"captionStartId="F5"captionText="Figure 5. Aedeagus of Coelostoma mixtum Mai & Jia, sp. nov. and Coelostoma vagum Orchymont, 1940. A-C C. mixtum sp. nov. A dorsal view B lateral view C ventral view D-F C. vagum D dorsal view E lateral view F illustration by Orchymont (1940). Scale bar: 0.5 mm (A-E)."figureDoi="10.3897/zookeys.1091.79564.figure5"httpUri="https://binary.pensoft.net/fig/666187"pageId="0"pageNumber="15">5A-C</figureCitation>
Orchymont, 1940, but median lobe narrowly rounded apically, apex without a sharp prominent tooth ventrally; parameres abruptly widened apically, distinctly bent inward.
<figureCitationid="2C939620BF059EAB19990389AA8C6E12"captionStart="Figure 4"captionStartId="F4"captionText="Figure 4. Coelostoma (Lachnocoelostoma) mixtum Mai & Jia, sp. nov. A dorsal view B ventral view C lateral view. Scale bar: 1.0 mm (A-C)."figureDoi="10.3897/zookeys.1091.79564.figure4"httpUri="https://binary.pensoft.net/fig/666186"pageId="0"pageNumber="15">4A-C</figureCitation>
). Total length 6.13 mm; maximum width 3.3 mm; body broadly oval, parallel-sided in the middle, moderately convex. Dorsum black and shiny. Labrum, maxillary palpi and labial palpi reddish brown, antennae yellowish to reddish brown with dark club. Ventral surface reddish brown to black. Femora and tibiae dark reddish brown, tarsi pale reddish.
Dorsal surface with dense fine punctures. Interstices between punctures smooth. Clypeus subtruncate anteriorly. Eyes of moderate size, distinctly emarginate anteriorly in lateral view, separated by ca. 4
the width of one eye. Mentum strongly emarginated anteriorly and depressed in anterior half, with sparse fine punctures. Antennae with nine antennomeres, antennal club (antennomeres 7-9) densely pubescent. Maxillary palpomere 2 strongly swollen, palpomere 4 truncate apically, slightly longer than palpomere 3. Gula narrow and glabrous.
<taxonomicNameid="48B8BD354807348D46DAB57C2298A664"authorityName="Mai & Jia"authorityYear="2022"class="Insecta"family="Hydrophilidae"genus="Coelostoma"higherTaxonomySource="CoL"kingdom="Animalia"lsidName="Coelostoma mixtum"order="Coleoptera"pageId="0"pageNumber="15"phylum="Arthropoda"rank="species"species="mixtum">
<bibRefCitationid="16A26D34C83F4432E05AADF2D76D0169"author="Orchymont, A d'"journalOrPublisher="Bulletin et Annales de la Societe Entomologique de Belgique"pageId="0"pageNumber="15"pagination="157 - 197"refId="B23"refString="Orchymont, A d', 1940. Contribution a l'etude des Palpicornia XIV. Bulletin et Annales de la Societe Entomologique de Belgique 80: 157 - 197"title="Contribution a l'etude des Palpicornia XIV."volume="80"year="1940">Orchymont (1940)</bibRefCitation>
Pronotum widest posteriorly, gradually narrowed anteriad, with punctures as on head, anterolateral angles obtusely rounded, posterolateral angles blunt, anterior and lateral margins with narrow marginal bead. Prosternum with a carina medially and a prominent tooth anteromedially. Scutellum in shape of equilateral triangle, with punctures finer and denser than those on pronotum. Elytra with punctures as on pronotum; elytra without serial punctures; sutural stria reaching anterior half of elytra; lateral margin of elytra with bead but not explanate.
Pro- and mesofemora bearing dense pubescence, except on extreme apex. Metafemora not pubescent, with dense microsculptures and spares fine punctures. Meso- and Metatibia slightly flattened, with strong apical spurs and series of sparse stout spines laterally. Tarsi with long dorsal setae and gold ventral setae; metatarsi with fifth tarsomere almost as long as third and fourth combined. Claws curved, with a pair of long setae beneath.
Abdominal ventrites densely pubescent. First ventrite with distinct median carina on basal one-thirds. Fifth ventrite with fine marginal bead and slightly emarginate apically.
<figureCitationid="D01EABDD2C3A3F0C8A1A543511692AA5"captionStart="Figure 5"captionStartId="F5"captionText="Figure 5. Aedeagus of Coelostoma mixtum Mai & Jia, sp. nov. and Coelostoma vagum Orchymont, 1940. A-C C. mixtum sp. nov. A dorsal view B lateral view C ventral view D-F C. vagum D dorsal view E lateral view F illustration by Orchymont (1940). Scale bar: 0.5 mm (A-E)."figureDoi="10.3897/zookeys.1091.79564.figure5"httpUri="https://binary.pensoft.net/fig/666187"pageId="0"pageNumber="15">5A-C</figureCitation>
as long as wide; median lobe gradually narrowing towards apex, with a small finger like apex, narrowly rounded apically; gonopore rounded, situated subapically; parameres much longer than the median lobe, abruptly widened apically, distinctly bent inward.
<bibRefCitationid="BAC0E8CE0B55BDBA5E7375B26B82F457"DOI="https://doi.org/10.11646/zootaxa.4232.1.8"author="Jia, F-L"journalOrPublisher="Zootaxa"pageId="0"pageNumber="15"pagination="113 - 122"refId="B15"refString="Jia, F-L, Lin, R-C, Chan, E, Skale, A, Fikacek, M, 2017. Two new species of Coelostoma Brulle, 1835 from China and additional faunistic records of the genus from the Oriental Region (Coleoptera: Hydrophilidae: Sphaeridiinae: Coelostomatini). Zootaxa 4232 (1): 113 - 122, DOI: https://doi.org/10.11646/zootaxa.4232.1.8"title="Two new species of Coelostoma Brulle, 1835 from China and additional faunistic records of the genus from the Oriental Region (Coleoptera: Hydrophilidae: Sphaeridiinae: Coelostomatini)."url="https://doi.org/10.11646/zootaxa.4232.1.8"volume="4232"year="2017">Jia et al. (2017)</bibRefCitation>
<bibRefCitationid="E6718AF563D2753C9DE661B971A8EB4E"DOI="https://doi.org/10.37520/aemnp.2020.008"author="Liu, H-C"journalOrPublisher="Acta Entomologica Musei Nationalis Pragae"pageId="0"pageNumber="15"pagination="155 - 162"refId="B19"refString="Liu, H-C, Hu, F-S, Fikacek, M, 2020. Review of the genus Coelostoma of Taiwan with description of a new species (Coleoptera: Hydrophilidae). Acta Entomologica Musei Nationalis Pragae 60 (1): 155 - 162, DOI: https://doi.org/10.37520/aemnp.2020.008"title="Review of the genus Coelostoma of Taiwan with description of a new species (Coleoptera: Hydrophilidae)."url="https://doi.org/10.37520/aemnp.2020.008"volume="60"year="2020">Liu et al. 2020</bibRefCitation>
<figureCitationid="A83C8BB9335C528096433D21ACE61B37"captionStart="Figure 5"captionStartId="F5"captionText="Figure 5. Aedeagus of Coelostoma mixtum Mai & Jia, sp. nov. and Coelostoma vagum Orchymont, 1940. A-C C. mixtum sp. nov. A dorsal view B lateral view C ventral view D-F C. vagum D dorsal view E lateral view F illustration by Orchymont (1940). Scale bar: 0.5 mm (A-E)."figureDoi="10.3897/zookeys.1091.79564.figure5"httpUri="https://binary.pensoft.net/fig/666187"pageId="0"pageNumber="15">5D-F</figureCitation>
<figureCitationid="CCCDE66DBAAE4CF520EE7E25800F2210"captionStart="Figure 5"captionStartId="F5"captionText="Figure 5. Aedeagus of Coelostoma mixtum Mai & Jia, sp. nov. and Coelostoma vagum Orchymont, 1940. A-C C. mixtum sp. nov. A dorsal view B lateral view C ventral view D-F C. vagum D dorsal view E lateral view F illustration by Orchymont (1940). Scale bar: 0.5 mm (A-E)."figureDoi="10.3897/zookeys.1091.79564.figure5"httpUri="https://binary.pensoft.net/fig/666187"pageId="0"pageNumber="15">5B</figureCitation>
<figureCitationid="092A908B48B0E6CF1C593B658EF8C698"captionStart="Figure 5"captionStartId="F5"captionText="Figure 5. Aedeagus of Coelostoma mixtum Mai & Jia, sp. nov. and Coelostoma vagum Orchymont, 1940. A-C C. mixtum sp. nov. A dorsal view B lateral view C ventral view D-F C. vagum D dorsal view E lateral view F illustration by Orchymont (1940). Scale bar: 0.5 mm (A-E)."figureDoi="10.3897/zookeys.1091.79564.figure5"httpUri="https://binary.pensoft.net/fig/666187"pageId="0"pageNumber="15">5E</figureCitation>
