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212 lines
20 KiB
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<document ID-DOI="http://dx.doi.org/10.3897/zookeys.476.8630" ID-PMC="PMC4311692" ID-Pensoft-Pub="1313-2970-476-1" ID-Pensoft-UUID="FC4DC947FF97FF86190BFFD8B82CAB56" ID-PubMed="25685002" ID-Zenodo-Dep="578702" ID-ZooBank="086D71AF8A294F028559C2E0456B5C5B" ModsDocID="1313-2970-476-1" checkinTime="1451244761026" checkinUser="pensoft" docAuthor="Gustafson, Grey T. & Miller, Kelly B." docDate="2015" docId="306836D0E0E4547A8964D3E162D43DC3" docLanguage="en" docName="ZooKeys 476: 1-135" docOrigin="ZooKeys 476" docPubDate="2015-01-23" docSource="http://dx.doi.org/10.3897/zookeys.476.8630" docTitle="Dineutus sp. near mexicanus" docType="treatment" docVersion="3" id="FC4DC947FF97FF86190BFFD8B82CAB56" lastPageNumber="90" masterDocId="FC4DC947FF97FF86190BFFD8B82CAB56" masterDocTitle="The New World whirligig beetles of the genus Dineutus Macleay, 1825 (Coleoptera, Gyrinidae, Gyrininae, Dineutini)" masterLastPageNumber="135" masterPageNumber="1" pageNumber="87" updateTime="1668159852297" updateUser="ExternalLinkService">
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<mods:mods xmlns:mods="http://www.loc.gov/mods/v3">
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<mods:titleInfo>
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<mods:title>The New World whirligig beetles of the genus Dineutus Macleay, 1825 (Coleoptera, Gyrinidae, Gyrininae, Dineutini)</mods:title>
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</mods:titleInfo>
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<mods:name type="personal">
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<mods:role>
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<mods:roleTerm>Author</mods:roleTerm>
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</mods:role>
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<mods:namePart>Gustafson, Grey T.</mods:namePart>
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<mods:affiliation>Department of Biology and Museum of Southwestern Biology, University of New Mexico, Albuquerque, NM 87131, USA</mods:affiliation>
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<mods:nameIdentifier type="email">gtgustafson@gmail.com</mods:nameIdentifier>
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</mods:name>
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<mods:name type="personal">
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<mods:role>
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<mods:roleTerm>Author</mods:roleTerm>
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</mods:role>
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<mods:namePart>Miller, Kelly B.</mods:namePart>
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<mods:affiliation>Department of Biology and Museum of Southwestern Biology, University of New Mexico, Albuquerque, NM 87131, USA</mods:affiliation>
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</mods:name>
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<mods:typeOfResource>text</mods:typeOfResource>
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<mods:relatedItem type="host">
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<mods:titleInfo>
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<mods:title>ZooKeys</mods:title>
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</mods:titleInfo>
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<mods:part>
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<mods:date>2015</mods:date>
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<mods:detail type="pubDate">
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<mods:number>2015-01-23</mods:number>
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</mods:detail>
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<mods:detail type="volume">
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<mods:number>476</mods:number>
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</mods:detail>
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<mods:extent unit="page">
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<mods:start>1</mods:start>
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<mods:end>135</mods:end>
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</mods:extent>
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</mods:part>
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</mods:relatedItem>
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<mods:location>
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<mods:url>http://dx.doi.org/10.3897/zookeys.476.8630</mods:url>
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</mods:location>
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<mods:classification>journal article</mods:classification>
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<mods:identifier type="DOI">http://dx.doi.org/10.3897/zookeys.476.8630</mods:identifier>
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<mods:identifier type="Pensoft-Pub">1313-2970-476-1</mods:identifier>
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<mods:identifier type="ZooBank">086D71AF8A294F028559C2E0456B5C5B</mods:identifier>
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<mods:identifier type="Pensoft-UUID">FC4DC947FF97FF86190BFFD8B82CAB56</mods:identifier>
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<mods:identifier type="Zenodo-Dep">578702</mods:identifier>
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</mods:mods>
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<treatment ID-GBIF-Taxon="182234734" LSID="urn:lsid:plazi:treatment:306836D0E0E4547A8964D3E162D43DC3" httpUri="http://treatment.plazi.org/id/306836D0E0E4547A8964D3E162D43DC3" lastPageId="89" lastPageNumber="90" pageId="86" pageNumber="87">
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<subSubSection pageId="86" pageNumber="87" type="nomenclature">
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<paragraph pageId="86" pageNumber="87">
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<taxonomicName LSID="306836D0-E0E4-547A-8964-D3E162D43DC3" authority="sp. near mexicanus" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus" order="Coleoptera" pageId="86" pageNumber="87" phylum="Arthropoda" rank="genus">Dineutus sp. near mexicanus</taxonomicName>
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</paragraph>
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</subSubSection>
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<subSubSection pageId="86" pageNumber="87" type="material examined">
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<paragraph pageId="86" pageNumber="87">Material examined.</paragraph>
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<paragraph pageId="86" pageNumber="87">"Tapanatepec 7 mi [black ink smudge]/ N.E. Oax. Mex [handwritten in black ink] 48/ 7-9-53 1300 ft. [black handwritten in ink] S// Univ.Kans/ Mex./ Expedition" deposited at the KSEM.</paragraph>
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</subSubSection>
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<subSubSection pageId="86" pageNumber="87" type="diagnosis">
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<paragraph pageId="86" pageNumber="87">Diagnosis.</paragraph>
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<paragraph pageId="86" pageNumber="87">
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Male (Fig.
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<figureCitation captionStart="Figure 49" captionStartId="F49" captionText="Figure 49. Dineutus sp. A ♂ dorsal habitus B ♂ ventral habitus. All scale bars ≈ 2 mm." pageId="86" pageNumber="87">49A-B</figureCitation>
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): Size: 17.45 mm. Body form regularly oval; elytral apices truncate, lateral corner of truncation roundly angled, blunt irregularities present apically, apicolateral margin weakly sinuate, elytral striae faint, elytra microreticulation present, apicolaterally with slightly bronzy appearance; ulimate protarsus (Fig.
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<figureCitation captionStart="Figure 30" captionStartId="F30" captionText="Figure 30. ♂ protarsus of A Dineutus mexicanus B Dineutus sp. from nr. Tapanatepec, Oaxaca, Mexico C Dineutus truncatus. Scale bar ≈ 1 mm." pageId="86" pageNumber="87">30B</figureCitation>
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) less than ca. 2
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<normalizedToken originalValue="×">x</normalizedToken>
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as long as wide, with angled lateral margin after basal 1/3, remaining protarsi with rounded lateral margins; protibiae club-shaped; profemora with small acute sub-apicoventral tooth; anterior mesotarsal claw (Fig.
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<figureCitation captionStart="Figure 50" captionStartId="F50" captionText="Figure 50. Dineutus sp. A aedeagus dorsal view B aedeagus ventral view C ♂ mesotarsal claws D aedeagus lateral view. Scale bar for C ≈ 0.10 mm all others ≈ 1 mm." pageId="86" pageNumber="87">50C</figureCitation>
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) with ventral margin expanded into weak denticle; venter darkly colored, reddish brown, mesothoracic and metathoracic legs usually lighter in coloration, as well as apex of abdomen; Aedeagus (Figs
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<figureCitation captionStart="Figure 50" captionStartId="F50" captionText="Figure 50. Dineutus sp. A aedeagus dorsal view B aedeagus ventral view C ♂ mesotarsal claws D aedeagus lateral view. Scale bar for C ≈ 0.10 mm all others ≈ 1 mm." pageId="86" pageNumber="87">50A, B, D</figureCitation>
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) with median lobe in dorsal view parallel sided, weakly laterally expanded in apical 1/4, apex shortly acuminate, ventrally with parallel sided sperm-groove, parameres noticeably laterally expanded in apical 1/3, asymmetrical, in lateral view parameres constricted near mid-length.
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</paragraph>
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<caption pageId="86" pageNumber="87" start="Figure 49" startId="F49">
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<paragraph pageId="86" pageNumber="87">
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<emphasis bold="true" pageId="86" pageNumber="87">Figure 49.</emphasis>
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<taxonomicName class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus" order="Coleoptera" pageId="86" pageNumber="87" phylum="Arthropoda" rank="genus">
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<emphasis italics="true" pageId="86" pageNumber="87">Dineutus</emphasis>
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</taxonomicName>
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sp.
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<emphasis bold="true" pageId="86" pageNumber="87">A</emphasis>
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♂ dorsal habitus
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<emphasis bold="true" pageId="86" pageNumber="87">B</emphasis>
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♂ ventral habitus. All scale bars ≈ 2 mm.
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</paragraph>
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</caption>
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<caption pageId="86" pageNumber="87" start="Figure 50" startId="F50">
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<paragraph pageId="86" pageNumber="87">
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<emphasis bold="true" pageId="86" pageNumber="87">Figure 50.</emphasis>
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<taxonomicName class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus" order="Coleoptera" pageId="86" pageNumber="87" phylum="Arthropoda" rank="genus">
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<emphasis italics="true" pageId="86" pageNumber="87">Dineutus</emphasis>
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</taxonomicName>
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sp.
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<emphasis bold="true" pageId="86" pageNumber="87">A</emphasis>
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aedeagus dorsal view
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<emphasis bold="true" pageId="86" pageNumber="87">B</emphasis>
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aedeagus ventral view
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<emphasis bold="true" pageId="86" pageNumber="87">C</emphasis>
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♂ mesotarsal claws
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<emphasis bold="true" pageId="86" pageNumber="87">D</emphasis>
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aedeagus lateral view. Scale bar for
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<emphasis bold="true" pageId="86" pageNumber="87">C</emphasis>
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≈ 0.10 mm all others ≈ 1 mm.
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</paragraph>
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</caption>
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</subSubSection>
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<subSubSection lastPageId="89" lastPageNumber="90" pageId="86" pageNumber="87" type="differential diagnosis">
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<paragraph pageId="86" pageNumber="87">Differential diagnosis.</paragraph>
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<paragraph lastPageId="87" lastPageNumber="88" pageId="86" pageNumber="87">
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This specimen is different from all other New World
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<taxonomicName class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus" order="Coleoptera" pageId="87" pageNumber="88" phylum="Arthropoda" rank="genus">
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<emphasis italics="true" pageId="87" pageNumber="88">
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<pageBreakToken pageId="87" pageNumber="88" start="start">Dineutus</pageBreakToken>
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</emphasis>
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</taxonomicName>
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species examined in having truncate elytra with the lateral angle rounded, with weak sinuation apicolaterally, and blunt irregularities present, the protarsus (Fig.
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<figureCitation captionStart="Figure 30" captionStartId="F30" captionText="Figure 30. ♂ protarsus of A Dineutus mexicanus B Dineutus sp. from nr. Tapanatepec, Oaxaca, Mexico C Dineutus truncatus. Scale bar ≈ 1 mm." pageId="87" pageNumber="88">30B</figureCitation>
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) has the lateral margin rounded, the ultimate protarsomere angled apically after the basal 1/3, and the form of the aedeagus (Fig.
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<figureCitation captionStart="Figure 50" captionStartId="F50" captionText="Figure 50. Dineutus sp. A aedeagus dorsal view B aedeagus ventral view C ♂ mesotarsal claws D aedeagus lateral view. Scale bar for C ≈ 0.10 mm all others ≈ 1 mm." pageId="87" pageNumber="88">50A</figureCitation>
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). The aedeagus of this specimen is unique among all known world species of
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<taxonomicName class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus" order="Coleoptera" pageId="87" pageNumber="88" phylum="Arthropoda" rank="genus">
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<emphasis italics="true" pageId="87" pageNumber="88">Dineutus</emphasis>
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</taxonomicName>
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in having parameres that are medially strongly constricted in lateral view. Externally, however, the specimen is most similar to the North American species
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<taxonomicName authorityName="Sharp" authorityYear="1873" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus truncatus" order="Coleoptera" pageId="87" pageNumber="88" phylum="Arthropoda" rank="species" species="truncatus">
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<emphasis italics="true" pageId="87" pageNumber="88">Dineutus truncatus</emphasis>
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</taxonomicName>
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and
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<taxonomicName authorityName="Ochs" authorityYear="1925" baseAuthorityName="Gustafson & Miller" baseAuthorityYear="2015" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus mexicanus" order="Coleoptera" pageId="87" pageNumber="88" phylum="Arthropoda" rank="species" species="mexicanus">
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<emphasis italics="true" pageId="87" pageNumber="88">Dineutus mexicanus</emphasis>
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</taxonomicName>
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. It can be separated from
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<taxonomicName authorityName="Sharp" authorityYear="1873" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus truncatus" order="Coleoptera" pageId="87" pageNumber="88" phylum="Arthropoda" rank="species" species="truncatus">
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<emphasis italics="true" pageId="87" pageNumber="88">Dineutus truncatus</emphasis>
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</taxonomicName>
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by the shape of the elytral truncature and the shape of the male protarsi (Fig.
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<figureCitation captionStart="Figure 30" captionStartId="F30" captionText="Figure 30. ♂ protarsus of A Dineutus mexicanus B Dineutus sp. from nr. Tapanatepec, Oaxaca, Mexico C Dineutus truncatus. Scale bar ≈ 1 mm." pageId="87" pageNumber="88">30</figureCitation>
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). In this specimen the elytral truncature has the lateral angles rounded and the apex with blunt irregularities, instead of the lateral angles of the truncature acute, with fine serration present at the elytral apices as in
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<taxonomicName authorityName="Sharp" authorityYear="1873" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus truncatus" order="Coleoptera" pageId="87" pageNumber="88" phylum="Arthropoda" rank="species" species="truncatus">
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<emphasis italics="true" pageId="87" pageNumber="88">Dineutus truncatus</emphasis>
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</taxonomicName>
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. The length of the ultimate protarsomere is less than 2
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<normalizedToken originalValue="×">x</normalizedToken>
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the width, whereas in
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<taxonomicName authorityName="Sharp" authorityYear="1873" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus truncatus" order="Coleoptera" pageId="87" pageNumber="88" phylum="Arthropoda" rank="species" species="truncatus">
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<emphasis italics="true" pageId="87" pageNumber="88">Dineutus truncatus</emphasis>
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</taxonomicName>
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the length is approximately 2
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<normalizedToken originalValue="×">x</normalizedToken>
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the width.
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</paragraph>
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<paragraph lastPageId="89" lastPageNumber="90" pageId="88" pageNumber="89">
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<pageBreakToken pageId="88" pageNumber="89" start="start">This</pageBreakToken>
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specimen and
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<taxonomicName authorityName="Ochs" authorityYear="1925" baseAuthorityName="Gustafson & Miller" baseAuthorityYear="2015" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus mexicanus" order="Coleoptera" pageId="89" pageNumber="90" phylum="Arthropoda" rank="species" species="mexicanus">
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<emphasis italics="true" pageId="89" pageNumber="90">
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<pageBreakToken pageId="89" pageNumber="90" start="start">Dineutus</pageBreakToken>
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mexicanus
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</emphasis>
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</taxonomicName>
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have similar elytral truncature, and similar ultimate protarsomere size ratios, however the shape of the protarsus is very different. It (Fig.
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<figureCitation captionStart="Figure 30" captionStartId="F30" captionText="Figure 30. ♂ protarsus of A Dineutus mexicanus B Dineutus sp. from nr. Tapanatepec, Oaxaca, Mexico C Dineutus truncatus. Scale bar ≈ 1 mm." pageId="89" pageNumber="90">30B</figureCitation>
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) has the lateral margin of protarsomeres II-IV broadly rounded, whereas in
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<taxonomicName authorityName="Ochs" authorityYear="1925" baseAuthorityName="Gustafson & Miller" baseAuthorityYear="2015" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus mexicanus" order="Coleoptera" pageId="89" pageNumber="90" phylum="Arthropoda" rank="species" species="mexicanus">
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<emphasis italics="true" pageId="89" pageNumber="90">Dineutus mexicanus</emphasis>
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</taxonomicName>
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(Fig.
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<figureCitation captionStart="Figure 30" captionStartId="F30" captionText="Figure 30. ♂ protarsus of A Dineutus mexicanus B Dineutus sp. from nr. Tapanatepec, Oaxaca, Mexico C Dineutus truncatus. Scale bar ≈ 1 mm." pageId="89" pageNumber="90">30A</figureCitation>
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) they are more flatly rounded to subtruncate. The ultimate protarsomere of this specimen is strongly angled apically after the basal 1/3 (Fig.
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<figureCitation captionStart="Figure 30" captionStartId="F30" captionText="Figure 30. ♂ protarsus of A Dineutus mexicanus B Dineutus sp. from nr. Tapanatepec, Oaxaca, Mexico C Dineutus truncatus. Scale bar ≈ 1 mm." pageId="89" pageNumber="90">30B</figureCitation>
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), whereas in
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<taxonomicName authorityName="Ochs" authorityYear="1925" baseAuthorityName="Gustafson & Miller" baseAuthorityYear="2015" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus mexicanus" order="Coleoptera" pageId="89" pageNumber="90" phylum="Arthropoda" rank="species" species="mexicanus">
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<emphasis italics="true" pageId="89" pageNumber="90">Dineutus mexicanus</emphasis>
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</taxonomicName>
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it is evenly tapered basally to apically (Fig.
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<figureCitation captionStart="Figure 30" captionStartId="F30" captionText="Figure 30. ♂ protarsus of A Dineutus mexicanus B Dineutus sp. from nr. Tapanatepec, Oaxaca, Mexico C Dineutus truncatus. Scale bar ≈ 1 mm." pageId="89" pageNumber="90">30A</figureCitation>
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). Also, in this specimen the frontoclypeal suture is sinuate medially with a rounded posterior expansion, whereas in
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<taxonomicName authorityName="Ochs" authorityYear="1925" baseAuthorityName="Gustafson & Miller" baseAuthorityYear="2015" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus mexicanus" order="Coleoptera" pageId="89" pageNumber="90" phylum="Arthropoda" rank="species" species="mexicanus">
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<emphasis italics="true" pageId="89" pageNumber="90">Dineutus mexicanus</emphasis>
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</taxonomicName>
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the suture is mostly flat and only weakly angled medially. The mesotarsal claws are also slightly different, with those of of this specimen having a slightly more developed denticle.
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</paragraph>
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</subSubSection>
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<subSubSection pageId="89" pageNumber="90" type="discussion">
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<paragraph pageId="89" pageNumber="90">Discussion.</paragraph>
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<paragraph pageId="89" pageNumber="90">
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There are several characters that suggest this specimen represents a species distinct from
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<taxonomicName authorityName="Ochs" authorityYear="1925" baseAuthorityName="Gustafson & Miller" baseAuthorityYear="2015" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus mexicanus" order="Coleoptera" pageId="89" pageNumber="90" phylum="Arthropoda" rank="species" species="mexicanus">
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<emphasis italics="true" pageId="89" pageNumber="90">Dineutus mexicanus</emphasis>
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</taxonomicName>
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(see the diagnosis and differential diagnosis section above). The aedeagus of this specimen is strange, even among the world
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<taxonomicName class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus" order="Coleoptera" pageId="89" pageNumber="90" phylum="Arthropoda" rank="genus">
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<emphasis italics="true" pageId="89" pageNumber="90">Dineutus</emphasis>
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</taxonomicName>
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fauna, as discussed above. While the aedeagus does appear to be asymmetrical in the parameres, suggesting a malformation, the rest of the body is highly symmetrical, without any noticeable deformities. Other specimens encountered that were clearly aberrant in some way, had asymmetrical features in the body, usually the prothoracic legs. Given the distinct characters discussed we have included the specimen here without placing it among any of the known species. However, as we only have a single specimen, and given its very odd genitalia, we have decided not to formally describe this species due to lack of additional material. Other
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<taxonomicName class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus" order="Coleoptera" pageId="89" pageNumber="90" phylum="Arthropoda" rank="genus">
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<emphasis italics="true" pageId="89" pageNumber="90">Dineutus</emphasis>
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</taxonomicName>
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specimens examined from western and north central Oaxaca (IEXA) belonged to
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<taxonomicName authorityName="Ochs" authorityYear="1925" baseAuthorityName="Gustafson & Miller" baseAuthorityYear="2015" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus mexicanus" order="Coleoptera" pageId="89" pageNumber="90" phylum="Arthropoda" rank="species" species="mexicanus">
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<emphasis italics="true" pageId="89" pageNumber="90">Dineutus mexicanus</emphasis>
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</taxonomicName>
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. However, this specimen comes from a locality to the south separated by a mountain range, again suggesting it may indeed represent a species other than
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<taxonomicName authorityName="Ochs" authorityYear="1925" baseAuthorityName="Gustafson & Miller" baseAuthorityYear="2015" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus mexicanus" order="Coleoptera" pageId="89" pageNumber="90" phylum="Arthropoda" rank="species" species="mexicanus">
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<emphasis italics="true" pageId="89" pageNumber="90">Dineutus mexicanus</emphasis>
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</taxonomicName>
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. Hopefully future collecting near Tapanatepec, Oaxaca, Mexico will allow placement of this enigmatic specimen.
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</paragraph>
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</subSubSection>
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</treatment>
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</document> |