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<document ID-DOI="http://dx.doi.org/10.3897/zookeys.1159.99218" ID-Pensoft-Pub="1313-2970-1159-87" ID-Pensoft-UUID="ECCECB868071523DB7628E304850BD62" ID-ZooBank="CD97DD120549412F976508D8DE21605B" ModsDocID="1313-2970-1159-87" checkinTime="1682458941538" checkinUser="pensoft" docAuthor="Okada, Ryohei, Jaitrong, Weeyawat &amp; Wewalka, Guenther" docDate="2023" docId="B2456B3F39C75B3982D2EEF6964E097D" docLanguage="en" docName="ZooKeys 1159: 87-119" docOrigin="ZooKeys 1159" docPubDate="2023-04-25" docSource="http://dx.doi.org/10.3897/zookeys.1159.99218" docTitle="Microdytes maximiliani Wewalka &amp; Okada 2023, sp. nov." docType="treatment" docUuid="E1377AC3-9A63-4D0A-BEEF-FEEFA69E26F3" docUuidSource="ZooBank" docVersion="1" id="ECCECB868071523DB7628E304850BD62" lastPageNumber="87" masterDocId="ECCECB868071523DB7628E304850BD62" masterDocTitle="A review of Microdytes J. Balfour-Browne, 1946 from Thailand, Laos, and Cambodia with descriptions of five new species and new records (Coleoptera, Dytiscidae)" masterLastPageNumber="119" masterPageNumber="87" pageNumber="87" updateTime="1682458941538" updateUser="pensoft">
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<mods:titleInfo>
<mods:title>A review of Microdytes J. Balfour-Browne, 1946 from Thailand, Laos, and Cambodia with descriptions of five new species and new records (Coleoptera, Dytiscidae)</mods:title>
</mods:titleInfo>
<mods:name type="personal">
<mods:role>
<mods:roleTerm>Author</mods:roleTerm>
</mods:role>
<mods:namePart>Okada, Ryohei</mods:namePart>
<mods:nameIdentifier type="ORCID">https://orcid.org/0000-0002-8488-0660</mods:nameIdentifier>
<mods:affiliation>Thailand Natural History Museum, National Science Museum, Technopolis, Pathum Thani, Thailand &amp; Coleopterological Society of Japan, National Museum of Nature and Science, Tsukuba, Japan</mods:affiliation>
<mods:nameIdentifier type="email">wasserinsekt@kub.biglobe.ne.jp</mods:nameIdentifier>
</mods:name>
<mods:name type="personal">
<mods:role>
<mods:roleTerm>Author</mods:roleTerm>
</mods:role>
<mods:namePart>Jaitrong, Weeyawat</mods:namePart>
<mods:nameIdentifier type="ORCID">https://orcid.org/0000-0003-1362-0754</mods:nameIdentifier>
<mods:affiliation>Thailand Natural History Museum, National Science Museum, Technopolis, Pathum Thani, Thailand</mods:affiliation>
</mods:name>
<mods:name type="personal">
<mods:role>
<mods:roleTerm>Author</mods:roleTerm>
</mods:role>
<mods:namePart>Wewalka, Guenther</mods:namePart>
<mods:nameIdentifier type="ORCID">https://orcid.org/0000-0002-2994-8001</mods:nameIdentifier>
<mods:affiliation>Starkfriedgasse 16 / 1 / 3, A - 1190 Vienna, Austria</mods:affiliation>
</mods:name>
<mods:typeOfResource>text</mods:typeOfResource>
<mods:relatedItem type="host">
<mods:titleInfo>
<mods:title>ZooKeys</mods:title>
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<mods:part>
<mods:date>2023</mods:date>
<mods:detail type="pubDate">
<mods:number>2023-04-25</mods:number>
</mods:detail>
<mods:detail type="volume">
<mods:number>1159</mods:number>
</mods:detail>
<mods:extent unit="page">
<mods:start>87</mods:start>
<mods:end>119</mods:end>
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<mods:location>
<mods:url>http://dx.doi.org/10.3897/zookeys.1159.99218</mods:url>
</mods:location>
<mods:classification>journal article</mods:classification>
<mods:identifier type="DOI">http://dx.doi.org/10.3897/zookeys.1159.99218</mods:identifier>
<mods:identifier type="Pensoft-Pub">1313-2970-1159-87</mods:identifier>
<mods:identifier type="ZooBank">CD97DD120549412F976508D8DE21605B</mods:identifier>
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<treatment LSID="urn:lsid:zoobank.org:act:E1377AC3-9A63-4D0A-BEEF-FEEFA69E26F3" httpUri="http://treatment.plazi.org/id/B2456B3F39C75B3982D2EEF6964E097D" lastPageNumber="87" pageId="0" pageNumber="87">
<subSubSection pageId="0" pageNumber="87" type="nomenclature">
<paragraph pageId="0" pageNumber="87">
<taxonomicName LSID="https://zoobank.org/E1377AC3-9A63-4D0A-BEEF-FEEFA69E26F3" authority="Wewalka &amp; Okada" authorityName="Wewalka &amp; Okada" authorityYear="2023" class="Insecta" family="Dytiscidae" genus="Microdytes" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Microdytes maximiliani" order="Coleoptera" pageId="0" pageNumber="87" phylum="Arthropoda" rank="species" species="maximiliani" status="sp. nov.">Microdytes maximiliani Wewalka &amp; Okada</taxonomicName>
<taxonomicNameLabel pageId="0" pageNumber="87">sp. nov.</taxonomicNameLabel>
</paragraph>
</subSubSection>
<subSubSection pageId="0" pageNumber="87" type="description">
<paragraph pageId="0" pageNumber="87">
<figureCitation captionStart="Figures 26" captionStartId="F2" captionText="Figures 2 - 6. Habitus of 2 Microdytes eliasi sp. nov., female, paratype 3 M. jeenthongi sp. nov., male, holotype 4 M. maximiliani sp. nov., male, holotype 5 M. sekaensis sp. nov., male, holotype 6 M. ubonensis sp. nov., male, holotype. Scale bar: 1.0 mm." figureDoi="10.3897/zookeys.1159.99218.figures2-6" httpUri="https://binary.pensoft.net/fig/842221" pageId="0" pageNumber="87">Figs 4</figureCitation>
<figureCitation captionStart="Figures 711" captionStartId="F3" captionText="Figures 7 - 11. Variation of markings of 7 Microdytes eliasi sp. nov. 8 M. jeenthongi sp. nov 9 M. maximiliani sp. nov. 10 M. sekaensis sp. nov. 11 M. ubonensis sp. nov. Scale bar: 1.0 mm." figureDoi="10.3897/zookeys.1159.99218.figures7-11" httpUri="https://binary.pensoft.net/fig/842222" pageId="0" pageNumber="87">, 9</figureCitation>
<figureCitation captionStart="Figures 1214" captionStartId="F4" captionText="Figures 12 - 14. 12 Microdytes eliasi sp. nov. 13 M. jeenthongi sp. nov. 14 M. maximiliani sp. nov. A median lobe in ventral aspect B median lobe in lateral aspect C left paramere in lateral aspect D right paramere in medial aspect. Scale bar: 0.25 mm." figureDoi="10.3897/zookeys.1159.99218.figures12-14" httpUri="https://binary.pensoft.net/fig/842223" pageId="0" pageNumber="87">, 14</figureCitation>
<figureCitation captionStart="Figures 3840" captionStartId="F8" captionText="Figures 38 - 40. Diagnostic characters of Microdytes species. 38 Impression of lateral side (M. maximiliani sp. nov.) 39 ventral surface A with setae (M. heineri) B with very coarse punctures (M. schoedli) C with coarse punctures (M. maculatus) D with fine punctures (M. balkei) E with very fine punctures (M. jeenthongi sp. nov.) 40 clypeus bead A not bordered (M. ubonensis sp. nov.) B finely bordered (M. schwendingeri) C produced (M. dimorphus)." figureDoi="10.3897/zookeys.1159.99218.figures38-40" httpUri="https://binary.pensoft.net/fig/842228" pageId="0" pageNumber="87">, 38</figureCitation>
</paragraph>
</subSubSection>
<subSubSection pageId="0" pageNumber="87" type="type locality">
<paragraph pageId="0" pageNumber="87">Type locality.</paragraph>
<paragraph pageId="0" pageNumber="87">Laos, Louang Namtha Province, 10 km E Muang Sing, 21°09-10'N, 101°13-15'E, alt. 750-1400 m.</paragraph>
</subSubSection>
<subSubSection pageId="0" pageNumber="87" type="type material">
<paragraph pageId="0" pageNumber="87">Type material.</paragraph>
<paragraph pageId="0" pageNumber="87">
<emphasis bold="true" italics="true" pageId="0" pageNumber="87">Holotype</emphasis>
(NMB): ♂, &quot;Laos, Louang Namtha prov., 10 km E Muang Sing, 750-1400 m, Ban Oudonsinh B. Nam Det \ B. Nam Mai, 21°09-10'N \ 101°13-15'E, 14.-20.V.2011&quot; \ &quot;NHMB Basel Laos 2011 Expedition D. Hauk &amp; M. Geiser&quot; [printed white labels] \ &quot;HOLOTYPUS
<taxonomicName authorityName="Wewalka &amp; Okada" authorityYear="2023" class="Insecta" family="Dytiscidae" genus="Microdytes" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Microdytes maximiliani" order="Coleoptera" pageId="0" pageNumber="87" phylum="Arthropoda" rank="species" species="maximiliani">Microdytes maximiliani</taxonomicName>
sp. nov. Wewalka &amp; Okada 2022&quot; [printed red label].
<emphasis bold="true" italics="true" pageId="0" pageNumber="87">Paratypes</emphasis>
(4 exs.): 2♂♂, 1♀, with same data as the holotype (CGW, NMB, NMP); 1♀, China: Yunnan, Xishuangbanna, ca. 10 km NW Menglun, ca. 700-800 m, 7.XI.1999, M.
<normalizedToken originalValue="Jäch">Jaech</normalizedToken>
et al. (CWBS 360) (NMW). All paratypes are provided with printed red paratype labels.
</paragraph>
</subSubSection>
<subSubSection pageId="0" pageNumber="87" type="diagnosis">
<paragraph pageId="0" pageNumber="87">Diagnosis.</paragraph>
<paragraph pageId="0" pageNumber="87">
<taxonomicName authorityName="Wewalka &amp; Okada" authorityYear="2023" class="Insecta" family="Dytiscidae" genus="Microdytes" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Microdytes maximiliani" order="Coleoptera" pageId="0" pageNumber="87" phylum="Arthropoda" rank="species" species="maximiliani">
<emphasis italics="true" pageId="0" pageNumber="87">Microdytes maximiliani</emphasis>
</taxonomicName>
sp. nov. resembles
<taxonomicName lsidName="M. satoi" pageId="0" pageNumber="87" rank="species" species="satoi">
<emphasis italics="true" pageId="0" pageNumber="87">M. satoi</emphasis>
</taxonomicName>
Wewalka, 1997 in coloration of pronotum and elytra but differs from this species by darker head, larger size, a distinct impression on lateral side in anterior third of elytron (Fig.
<figureCitation captionStart="Figures 3840" captionStartId="F8" captionText="Figures 38 - 40. Diagnostic characters of Microdytes species. 38 Impression of lateral side (M. maximiliani sp. nov.) 39 ventral surface A with setae (M. heineri) B with very coarse punctures (M. schoedli) C with coarse punctures (M. maculatus) D with fine punctures (M. balkei) E with very fine punctures (M. jeenthongi sp. nov.) 40 clypeus bead A not bordered (M. ubonensis sp. nov.) B finely bordered (M. schwendingeri) C produced (M. dimorphus)." figureDoi="10.3897/zookeys.1159.99218.figures38-40" httpUri="https://binary.pensoft.net/fig/842228" pageId="0" pageNumber="87">38</figureCitation>
) and male genitalia. It is similar to
<taxonomicName lsidName="M. paoloi" pageId="0" pageNumber="87" rank="species" species="paoloi">
<emphasis italics="true" pageId="0" pageNumber="87">M. paoloi</emphasis>
</taxonomicName>
Wewalka, 2011 in size and coloration of pronotum but can be distinguished by elytral markings, the impression on lateral side of elytron and male genitalia. The shape of median lobe of aedeagus of
<taxonomicName lsidName="M. maximiliani" pageId="0" pageNumber="87" rank="species" species="maximiliani">
<emphasis italics="true" pageId="0" pageNumber="87">M. maximiliani</emphasis>
</taxonomicName>
is very similar to that of
<taxonomicName lsidName="M. schoenmanni" pageId="0" pageNumber="87" rank="species" species="schoenmanni">
<emphasis italics="true" pageId="0" pageNumber="87">M. schoenmanni</emphasis>
</taxonomicName>
Wewalka, 1997, but this species is much smaller and differs in coloration, punctation and a missing impression on lateral side of elytron.
</paragraph>
</subSubSection>
<subSubSection pageId="0" pageNumber="87" type="description">
<paragraph pageId="0" pageNumber="87">Description.</paragraph>
<paragraph pageId="0" pageNumber="87">
<emphasis bold="true" pageId="0" pageNumber="87">
<emphasis italics="true" pageId="0" pageNumber="87">Measurements</emphasis>
.
</emphasis>
TL = 1.60-2.00 mm (1.86 mm), TL-h = 1.40-1.80 mm (1.61 mm), MW = 1.30-1.35 mm (1.30 mm), TL/MW = 1.23-1.43 (1.43). Body broad and regularly oval, quite convex (Figs
<figureCitation captionStart="Figures 26" captionStartId="F2" captionText="Figures 2 - 6. Habitus of 2 Microdytes eliasi sp. nov., female, paratype 3 M. jeenthongi sp. nov., male, holotype 4 M. maximiliani sp. nov., male, holotype 5 M. sekaensis sp. nov., male, holotype 6 M. ubonensis sp. nov., male, holotype. Scale bar: 1.0 mm." figureDoi="10.3897/zookeys.1159.99218.figures2-6" httpUri="https://binary.pensoft.net/fig/842221" pageId="0" pageNumber="87">4</figureCitation>
,
<figureCitation captionStart="Figures 3840" captionStartId="F8" captionText="Figures 38 - 40. Diagnostic characters of Microdytes species. 38 Impression of lateral side (M. maximiliani sp. nov.) 39 ventral surface A with setae (M. heineri) B with very coarse punctures (M. schoedli) C with coarse punctures (M. maculatus) D with fine punctures (M. balkei) E with very fine punctures (M. jeenthongi sp. nov.) 40 clypeus bead A not bordered (M. ubonensis sp. nov.) B finely bordered (M. schwendingeri) C produced (M. dimorphus)." figureDoi="10.3897/zookeys.1159.99218.figures38-40" httpUri="https://binary.pensoft.net/fig/842228" pageId="0" pageNumber="87">38</figureCitation>
).
</paragraph>
<paragraph pageId="0" pageNumber="87">
<emphasis bold="true" pageId="0" pageNumber="87">
<emphasis italics="true" pageId="0" pageNumber="87">Coloration</emphasis>
.
</emphasis>
Head dark reddish brown, darker on vertex and along eyes. Pronotum dark brown. Elytron dark brown with yellowish brown markings forming a distinct transverse band near base not reaching suture and lateral margin, a post-median lateral spot often connected with a triangular spot near apex (Figs
<figureCitation captionStart="Figures 26" captionStartId="F2" captionText="Figures 2 - 6. Habitus of 2 Microdytes eliasi sp. nov., female, paratype 3 M. jeenthongi sp. nov., male, holotype 4 M. maximiliani sp. nov., male, holotype 5 M. sekaensis sp. nov., male, holotype 6 M. ubonensis sp. nov., male, holotype. Scale bar: 1.0 mm." figureDoi="10.3897/zookeys.1159.99218.figures2-6" httpUri="https://binary.pensoft.net/fig/842221" pageId="0" pageNumber="87">4</figureCitation>
,
<figureCitation captionStart="Figures 711" captionStartId="F3" captionText="Figures 7 - 11. Variation of markings of 7 Microdytes eliasi sp. nov. 8 M. jeenthongi sp. nov 9 M. maximiliani sp. nov. 10 M. sekaensis sp. nov. 11 M. ubonensis sp. nov. Scale bar: 1.0 mm." figureDoi="10.3897/zookeys.1159.99218.figures7-11" httpUri="https://binary.pensoft.net/fig/842222" pageId="0" pageNumber="87">9</figureCitation>
). Elytral epipleuron and ventral surface dark brown to black. Legs, antennae and palpi reddish brown.
</paragraph>
<paragraph pageId="0" pageNumber="87">
<emphasis bold="true" pageId="0" pageNumber="87">
<emphasis italics="true" pageId="0" pageNumber="87">Sculpture and structure</emphasis>
.
</emphasis>
Head finely and sparsely punctured, stronger punctures along eyes and on vertex; with fine microreticulation missing on vertex; clypeus not bordered. Pronotum irregularly punctured with sparse fine punctures and strong punctures concentrated along posterior margin and sparsely on disc; without microreticulation; lateral margins finely bordered, scarcely rounded. Elytron quite regularly, moderately densely and fairly strongly punctured, with traces of two longitudinal rows of punctures; highly polished and shining; without microreticulation; with a distinct impression on lateral side in anterior third (Fig.
<figureCitation captionStart="Figures 3840" captionStartId="F8" captionText="Figures 38 - 40. Diagnostic characters of Microdytes species. 38 Impression of lateral side (M. maximiliani sp. nov.) 39 ventral surface A with setae (M. heineri) B with very coarse punctures (M. schoedli) C with coarse punctures (M. maculatus) D with fine punctures (M. balkei) E with very fine punctures (M. jeenthongi sp. nov.) 40 clypeus bead A not bordered (M. ubonensis sp. nov.) B finely bordered (M. schwendingeri) C produced (M. dimorphus)." figureDoi="10.3897/zookeys.1159.99218.figures38-40" httpUri="https://binary.pensoft.net/fig/842228" pageId="0" pageNumber="87">38</figureCitation>
). Ventral surface: metacoxae, metasternum and abdomen moderately strongly but very sparsely punctured; without microreticulation.
</paragraph>
<paragraph pageId="0" pageNumber="87">
<emphasis bold="true" pageId="0" pageNumber="87">Male.</emphasis>
Median lobe of aedeagus in ventral aspect slightly tapered from base to apex, expanded before apex, apex truncate (Fig.
<figureCitation captionStart="Figures 1214" captionStartId="F4" captionText="Figures 12 - 14. 12 Microdytes eliasi sp. nov. 13 M. jeenthongi sp. nov. 14 M. maximiliani sp. nov. A median lobe in ventral aspect B median lobe in lateral aspect C left paramere in lateral aspect D right paramere in medial aspect. Scale bar: 0.25 mm." figureDoi="10.3897/zookeys.1159.99218.figures12-14" httpUri="https://binary.pensoft.net/fig/842223" pageId="0" pageNumber="87">14A</figureCitation>
); in lateral aspect straight, tapered in apical ninth, apex bent downwards (Fig.
<figureCitation captionStart="Figures 1214" captionStartId="F4" captionText="Figures 12 - 14. 12 Microdytes eliasi sp. nov. 13 M. jeenthongi sp. nov. 14 M. maximiliani sp. nov. A median lobe in ventral aspect B median lobe in lateral aspect C left paramere in lateral aspect D right paramere in medial aspect. Scale bar: 0.25 mm." figureDoi="10.3897/zookeys.1159.99218.figures12-14" httpUri="https://binary.pensoft.net/fig/842223" pageId="0" pageNumber="87">14B</figureCitation>
). Parameres narrow triangular in lateral aspect (Fig.
<figureCitation captionStart="Figures 1214" captionStartId="F4" captionText="Figures 12 - 14. 12 Microdytes eliasi sp. nov. 13 M. jeenthongi sp. nov. 14 M. maximiliani sp. nov. A median lobe in ventral aspect B median lobe in lateral aspect C left paramere in lateral aspect D right paramere in medial aspect. Scale bar: 0.25 mm." figureDoi="10.3897/zookeys.1159.99218.figures12-14" httpUri="https://binary.pensoft.net/fig/842223" pageId="0" pageNumber="87">14C, D</figureCitation>
).
</paragraph>
<paragraph pageId="0" pageNumber="87">
<emphasis bold="true" pageId="0" pageNumber="87">Female.</emphasis>
Without secondary sexual characters. Sclerotized spermatheca not found.
</paragraph>
</subSubSection>
<subSubSection pageId="0" pageNumber="87" type="variation">
<paragraph pageId="0" pageNumber="87">Variation.</paragraph>
<paragraph pageId="0" pageNumber="87">
Variation of markings is shown in Fig.
<figureCitation captionStart="Figures 711" captionStartId="F3" captionText="Figures 7 - 11. Variation of markings of 7 Microdytes eliasi sp. nov. 8 M. jeenthongi sp. nov 9 M. maximiliani sp. nov. 10 M. sekaensis sp. nov. 11 M. ubonensis sp. nov. Scale bar: 1.0 mm." figureDoi="10.3897/zookeys.1159.99218.figures7-11" httpUri="https://binary.pensoft.net/fig/842222" pageId="0" pageNumber="87">9</figureCitation>
.
</paragraph>
</subSubSection>
<subSubSection pageId="0" pageNumber="87" type="etymology">
<paragraph pageId="0" pageNumber="87">Etymology.</paragraph>
<paragraph pageId="0" pageNumber="87">
This species is dedicated to Maximilian
<normalizedToken originalValue="Bramböck">Bramboeck</normalizedToken>
, Vienna, Austria. The species epithet is a name in the genitive singular.
</paragraph>
</subSubSection>
<subSubSection pageId="0" pageNumber="87" type="habitat">
<paragraph pageId="0" pageNumber="87">Habitat.</paragraph>
<paragraph pageId="0" pageNumber="87">
The species was collected in Yunnan in a 1-2-m wide stream flowing through dense primary forest (
<bibRefCitation author="Jaech, MA" journalOrPublisher="The Raffles Bulletin of Zoology" pageId="0" pageNumber="87" refId="B9" refString="Jaech, MA, Ji, L, 2003. China Water Beetle Survey (1999-2003), 20 pp. In: Jaech MA, Ji L (Eds) Water Beetles of China (Vol. III). Zoologisch-Botanische Gesellschaft and Wiener Coleopterologenverein, Wien, [vi +] 572 pp." title="China Water Beetle Survey (1999 - 2003), 20 pp. In: Jaech MA, Ji L (Eds) Water Beetles of China (Vol. III). Zoologisch-Botanische Gesellschaft and Wiener Coleopterologenverein, Wien, [vi +] 572 pp." year="2003">
<normalizedToken originalValue="Jäch">Jaech</normalizedToken>
and Ji 2003
</bibRefCitation>
).
</paragraph>
</subSubSection>
<subSubSection pageId="0" pageNumber="87" type="distribution">
<paragraph pageId="0" pageNumber="87">Distribution.</paragraph>
<paragraph pageId="0" pageNumber="87">Laos: Louang Namtha Province; China: Yunnan Province.</paragraph>
</subSubSection>
</treatment>
</document>