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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. &amp; Miller, Kelly B." docDate="2015" docId="0E592D3D520542A4BA0C2A45059202E4" 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 nigrior Roberts 1895" docType="treatment" docVersion="5" id="FC4DC947FF97FF86190BFFD8B82CAB56" lastPageNumber="60" masterDocId="FC4DC947FF97FF86190BFFD8B82CAB56" masterDocTitle="The New World whirligig beetles of the genus Dineutus Macleay, 1825 (Coleoptera, Gyrinidae, Gyrininae, Dineutini)" masterLastPageNumber="135" masterPageNumber="1" pageNumber="57" updateTime="1668159852297" updateUser="ExternalLinkService">
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<mods:titleInfo>
<mods:title>The New World whirligig beetles of the genus Dineutus Macleay, 1825 (Coleoptera, Gyrinidae, Gyrininae, Dineutini)</mods:title>
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<mods:name type="personal">
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<mods:roleTerm>Author</mods:roleTerm>
</mods:role>
<mods:namePart>Gustafson, Grey T.</mods:namePart>
<mods:affiliation>Department of Biology and Museum of Southwestern Biology, University of New Mexico, Albuquerque, NM 87131, USA</mods:affiliation>
<mods:nameIdentifier type="email">gtgustafson@gmail.com</mods:nameIdentifier>
</mods:name>
<mods:name type="personal">
<mods:role>
<mods:roleTerm>Author</mods:roleTerm>
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<mods:namePart>Miller, Kelly B.</mods:namePart>
<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:title>ZooKeys</mods:title>
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<mods:date>2015</mods:date>
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<mods:number>2015-01-23</mods:number>
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<mods:detail type="volume">
<mods:number>476</mods:number>
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<mods:url>http://dx.doi.org/10.3897/zookeys.476.8630</mods:url>
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<mods:classification>journal article</mods:classification>
<mods:identifier type="DOI">http://dx.doi.org/10.3897/zookeys.476.8630</mods:identifier>
<mods:identifier type="Pensoft-Pub">1313-2970-476-1</mods:identifier>
<mods:identifier type="ZooBank">086D71AF8A294F028559C2E0456B5C5B</mods:identifier>
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<mods:identifier type="Zenodo-Dep">578702</mods:identifier>
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<treatment ID-GBIF-Taxon="152057941" LSID="urn:lsid:plazi:treatment:0E592D3D520542A4BA0C2A45059202E4" httpUri="http://treatment.plazi.org/id/0E592D3D520542A4BA0C2A45059202E4" lastPageId="59" lastPageNumber="60" pageId="56" pageNumber="57">
<subSubSection pageId="56" pageNumber="57" type="nomenclature">
<paragraph pageId="56" pageNumber="57">
<taxonomicName LSID="0E592D3D-5205-42A4-BA0C-2A45059202E4" authority="Roberts, 1895" authorityName="Roberts" authorityYear="1895" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus nigrior" order="Coleoptera" pageId="56" pageNumber="57" phylum="Arthropoda" rank="species" species="nigrior">Dineutus nigrior Roberts, 1895</taxonomicName>
<figureCitation captionStart="Figure 31" captionStartId="F31" captionText="Figure 31. Dineutus nigrior. A ♀ dorsal habitus B ♀ ventral habitus C ♂ dorsal habitus D ♂ ventral habitus. All scale bars ≈ 2 mm." pageId="56" pageNumber="57">Figures 31</figureCitation>
<figureCitation captionStart="Figure 32" captionStartId="F32" captionText="Figure 32. Dineutus nigrior. 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="56" pageNumber="57">, 32</figureCitation>
<figureCitation captionStart="Figure 52" captionStartId="F52" captionText="Figure 52. General distribution map. A Dineutus assimilis B Dineutus hornii C Dineutus nigrior D Dineutus discolor and Dineutus angustus." pageId="56" pageNumber="57">, 52</figureCitation>
</paragraph>
</subSubSection>
<subSubSection pageId="57" pageNumber="58" type="reference_group">
<paragraph pageId="57" pageNumber="58">
<taxonomicName class="Insecta" family="Gyrinidae" genus="Dineutes" higherTaxonomySource="GBIF" kingdom="Animalia" lsidName="Dineutes nigrior" order="Coleoptera" pageId="57" pageNumber="58" phylum="Arthropoda" rank="species" species="nigrior">
<pageBreakToken pageId="57" pageNumber="58" start="start">Dineutes</pageBreakToken>
nigrior
</taxonomicName>
<bibRefCitation author="Roberts, CH" journalOrPublisher="Transactions of the American Entomological Society" pageId="95" pageNumber="96" pagination="279 - 288" refId="B107" refString="Roberts, CH, 1895. The species of Dineutes of America north of Mexico. Transactions of the American Entomological Society 22: 279 - 288" title="The species of Dineutes of America north of Mexico." volume="22" year="1895">Roberts 1895</bibRefCitation>
: 280,
<taxonomicName authorityName="Roberts" authorityYear="1895" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus (Cyclinus) nigrior" order="Coleoptera" pageId="57" pageNumber="58" phylum="Arthropoda" rank="species" species="nigrior" subGenus="Cyclinus">Dineutus (Cyclinus) nigrior</taxonomicName>
:
<bibRefCitation author="Hatch, MH" journalOrPublisher="Papers of the Michigan Academy of Science, Arts and Letters" pageId="92" pageNumber="93" pagination="311 - 350" refId="B42" refString="Hatch, MH, 1926. The morphology of Gyrinidae. Papers of the Michigan Academy of Science, Arts and Letters 7: 311 - 350" title="The morphology of Gyrinidae." volume="7" year="1926">Hatch 1926</bibRefCitation>
a: 311,
<taxonomicName authorityName="Roberts" authorityYear="1895" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus (Cyclous) nigrior" order="Coleoptera" pageId="57" pageNumber="58" phylum="Arthropoda" rank="species" species="nigrior" subGenus="Cyclous">Dineutus (Cyclous) nigrior</taxonomicName>
:
<bibRefCitation author="Hatch, MH" journalOrPublisher="Bulletin of the Brooklyn Entomological Society" pageId="92" pageNumber="93" pagination="27 - 28" refId="B43" refString="Hatch, MH, 1927. Notes on the biology of Dineutus (Gyrinidae). Bulletin of the Brooklyn Entomological Society 22: 27 - 28" title="Notes on the biology of Dineutus (Gyrinidae)." volume="22" year="1927">Hatch 1927</bibRefCitation>
: 28,
<taxonomicName authorityName="Roberts" authorityYear="1895" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus (Cyclinus) nigrior" order="Coleoptera" pageId="57" pageNumber="58" phylum="Arthropoda" rank="species" species="nigrior" subGenus="Cyclinus">Dineutus (Cyclinus) nigrior</taxonomicName>
: Hatch 1930: 20.
<taxonomicName class="Insecta" family="Gyrinidae" genus="Dineutes" higherTaxonomySource="GBIF" kingdom="Animalia" lsidName="Dineutes nigrior" order="Coleoptera" pageId="57" pageNumber="58" phylum="Arthropoda" rank="species" species="nigrior">
<emphasis italics="true" pageId="57" pageNumber="58">Dineutes nigrior</emphasis>
</taxonomicName>
:
<bibRefCitation author="Brimley, CS" journalOrPublisher="North Carolina Department of Agriculture" pageId="91" pageNumber="92" refId="B7" refString="Brimley, CS, 1938. The insects of North Carolina: being a list of the insects of North Carolina and their close relatives. North Carolina Department of Agriculture" title="The insects of North Carolina: being a list of the insects of North Carolina and their close relatives" year="1938">Brimley 1938</bibRefCitation>
: 132,
<taxonomicName authorityName="Roberts" authorityYear="1895" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus (Cyclinus) nigrior" order="Coleoptera" pageId="57" pageNumber="58" phylum="Arthropoda" rank="species" species="nigrior" subGenus="Cyclinus">Dineutus (Cyclinus) nigrior</taxonomicName>
:
<bibRefCitation author="Guignot, F" journalOrPublisher="Bulletin Mensuel de la Societe Linneenne de Lyon" pageId="91" pageNumber="92" pagination="124 - 127" refId="B36" refString="Guignot, F, 1950. Sur la systematique des Dineutus (Col. Gyrinidae). Bulletin Mensuel de la Societe Linneenne de Lyon 19: 124 - 127" title="Sur la systematique des Dineutus (Col. Gyrinidae)." volume="19" year="1950">Guignot 1950</bibRefCitation>
: 126,
<taxonomicName authorityName="Roberts" authorityYear="1895" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus nigrior" order="Coleoptera" pageId="57" pageNumber="58" phylum="Arthropoda" rank="species" species="nigrior">
<emphasis italics="true" pageId="57" pageNumber="58">Dineutus nigrior</emphasis>
</taxonomicName>
:
<bibRefCitation author="Ferkinhoff, WD" journalOrPublisher="Scientific Publications of the Science Museum of Minnesota" pageId="91" pageNumber="92" pagination="3 - 53" refId="B23" refString="Ferkinhoff, WD, Gunderson, RW, 1983. A key to the whirligig beetles of Minnesota and adjacent states and Canadian provinces (Coleoptera: Gyrinidae). Scientific Publications of the Science Museum of Minnesota 7: 3 - 53" title="A key to the whirligig beetles of Minnesota and adjacent states and Canadian provinces (Coleoptera: Gyrinidae)." volume="7" year="1983">Ferkinhoff and Gunderson 1983</bibRefCitation>
: 19.
</paragraph>
</subSubSection>
<subSubSection pageId="57" pageNumber="58" type="type locality">
<paragraph pageId="57" pageNumber="58">Type locality.</paragraph>
<paragraph pageId="57" pageNumber="58">USA, Vermont.</paragraph>
</subSubSection>
<subSubSection pageId="57" pageNumber="58" type="specimens examined">
<paragraph pageId="57" pageNumber="58">Specimens examined.</paragraph>
<paragraph pageId="57" pageNumber="58">
<emphasis bold="true" pageId="57" pageNumber="58">34</emphasis>
</paragraph>
</subSubSection>
<subSubSection pageId="57" pageNumber="58" type="type material examined">
<paragraph pageId="57" pageNumber="58">Type material examined.</paragraph>
<paragraph pageId="57" pageNumber="58">
Syntype (♂ pinned, aedeagus extruded) &quot;Bengtn. Co., Vt./Acc.4858/ LECTOTYPE/
<taxonomicName authorityName="Roberts" authorityYear="1895" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="nigrior" order="Coleoptera" pageId="57" pageNumber="58" phylum="Arthropoda" rank="species" species="nigrior">nigrior</taxonomicName>
♂ type # 1 C.H.R./LECTOTYPE
<taxonomicName authorityName="Roberts" authorityYear="1895" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus nigrior" order="Coleoptera" pageId="57" pageNumber="58" phylum="Arthropoda" rank="species" species="nigrior">Dineutus nigrior</taxonomicName>
Desig: R.P. Withington III 1998/
<taxonomicName authorityName="Roberts" authorityYear="1895" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus nigrior" order="Coleoptera" pageId="57" pageNumber="58" phylum="Arthropoda" rank="species" species="nigrior">Dineutus nigrior</taxonomicName>
Roberts 1895 Det: L. Cook 2005&quot; AMNH type catalogue no. 498.
</paragraph>
</subSubSection>
<subSubSection pageId="57" pageNumber="58" type="material examined">
<paragraph pageId="57" pageNumber="58">Material examined.</paragraph>
<paragraph pageId="57" pageNumber="58">
<emphasis bold="true" pageId="57" pageNumber="58">U.S.A.:</emphasis>
<emphasis bold="true" pageId="57" pageNumber="58">Delaware:</emphasis>
Sussex Co., Milsboro, 13.v.1973, leg. T.E. Rogers (1 ex. FSCA);
<emphasis bold="true" pageId="57" pageNumber="58">Florida:</emphasis>
Alachua Co., Gainesville, 27.vi.1961, leg. R.F. Bussey (1 ex. FSCA); Liberty Co., Torreya State Park, 25.v.1981, leg. J.R. Watts, at U.V. (1 ex. FSCA);
<emphasis bold="true" pageId="57" pageNumber="58">Indiana:</emphasis>
Crawford Co., Grantsburg, 18.vii.1965, leg. D. Eckert, Blacklight trap (1 ex. FSCA);
<emphasis bold="true" pageId="57" pageNumber="58">Maryland:</emphasis>
Prince
<normalizedToken originalValue="Georges">George's</normalizedToken>
Co., College Park, 16.vi.1948, leg. B.K. Detler, in pond (1 ex. FSCA); Prince
<normalizedToken originalValue="Georges">George's</normalizedToken>
CO., Blue Pond, 29.ix.1949, leg. H.L. Dozier, (1 ex. FSCA);
<emphasis bold="true" pageId="57" pageNumber="58">Massachusetts:</emphasis>
Suffolk Co, Forest Hills, 18.iv.1919 (1 ex. FSCA);
<emphasis bold="true" pageId="57" pageNumber="58">Michigan:</emphasis>
Allegan Co., State Game Area, 17.vii.1986, leg. J.A. Shuey (1 ex. MTEC); Cheboygan Co., Douglas Lake, 30.vii.1927, leg. H.B. Hungerford (1 ex. KSEM); same as previous except: &quot;Mud L&quot;, 31.vii.1923 (1 ex. KSEM); Washtenaw Co., &quot;118 8h&quot;, 24.iv.1921, leg. M.H. Hatch (1 ex. FSCA);
<emphasis bold="true" pageId="57" pageNumber="58">Minnesota:</emphasis>
Clearwater Co., Elk Springs, Itasca State Park, 12.viii.1965, leg. J.S. Nordin, attracted to U.V. (2 ex. FSCA); same as previous except: 7.vii.1965 (1 ex. FSCA); Morner Co., nr. Grand Meadow, roadside park, 18.viii.1965, leg. R.H. Arnett, in dammed pond (2 ex. FSCA);
<emphasis bold="true" pageId="57" pageNumber="58">Missouri:</emphasis>
Wayne Co., 3.2 mi WSW of Patterson Co. Rd. 332, deciduous Ozark forest and old field flora, 4.vii.1988, leg. H.M. Webber, at U.V. light (1 ex. FSCA);
<emphasis bold="true" pageId="57" pageNumber="58">New Jersey:</emphasis>
Cumberland Co., &quot;Dividing Ck. Hansey Creek Rd.&quot;, edge of salt marshes, 30.ix.1989, leg. D. Schloeitzer, at UV light (1 ex. FSCA);
<emphasis bold="true" pageId="57" pageNumber="58">New York:</emphasis>
Schuyler Co., Texas Hollow State Wildlife Area, 1.ix.1999, leg. K.B. Miller (1 ex. MSBA); Westchester Co., White Plains, 5.ix.1922, leg. E.H.P. Squire (1 ex. FSCA); same as previous except: 3.viii.1923 (2 ex. FSCA); same as previous except: 19.v.1923 (1 ex. FSCA); same as previous except: 30.v.1923 (1 ex. FSCA); same as previous except: 10.iii.1923 (1 ex. FSCA); same as previous except: 18.x.1924 (2 ex. FSCA); same as previous except: 12.iv.1925 (1 ex. FSCA); same as previous except: 19.v.1925 (1 ex. FSCA); Westchester Co., Montrose, 4.vii.1932, leg. C.L. Ragot (1 ex. FSCA);
<emphasis bold="true" pageId="57" pageNumber="58">Pennsylvania:</emphasis>
Sullivan Co., Picketts Glen St. Pk., 5.vii.1960, leg. G.W. Byers (2 ex. KSEM);
<emphasis bold="true" pageId="57" pageNumber="58">Virginia:</emphasis>
Giles Co., Mt. Lake Biol. Stat., 30.vi.1968, leg. H. Greenbaum (1 ex. FSCA);
<emphasis bold="true" pageId="57" pageNumber="58">Wisconsin:</emphasis>
Douglas Co., State Hunting Grounds,
<normalizedToken originalValue="“T44N.R12W.Sec.11”">&quot;T44N.R12W.Sec.11&quot;</normalizedToken>
, 23.vi.1999, leg. A Ramsdale, black light in barrens (1 ex. MTEC).
</paragraph>
</subSubSection>
<subSubSection lastPageId="58" lastPageNumber="59" pageId="57" pageNumber="58" type="diagnosis">
<paragraph pageId="57" pageNumber="58">Diagnosis.</paragraph>
<paragraph lastPageId="58" lastPageNumber="59" pageId="57" pageNumber="58">
Male (Fig.
<figureCitation captionStart="Figure 31" captionStartId="F31" captionText="Figure 31. Dineutus nigrior. A ♀ dorsal habitus B ♀ ventral habitus C ♂ dorsal habitus D ♂ ventral habitus. All scale bars ≈ 2 mm." pageId="57" pageNumber="58">31C-D</figureCitation>
): Size: 11.1-11.7 mm. Body form narrowly oval; elytral apices with sutural angle produced into a point, elytral striae faint basally becoming more evident apically and laterally; profemora without a sub-apicoventral tooth; protibiae wedge-shaped, with distolateral margin produced; mesotarsal claws markedly asymmetrical (Fig.
<figureCitation captionStart="Figure 32" captionStartId="F32" captionText="Figure 32. Dineutus nigrior. 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="57" pageNumber="58">32C</figureCitation>
), anterior mesotarsal claw larger than posterior claw, venter darkly colored, reddish brown to black with mesothoracic and metathoracic legs lighter in color; Aedeagus (Fig.
<figureCitation captionStart="Figure 32" captionStartId="F32" captionText="Figure 32. Dineutus nigrior. 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="57" pageNumber="58">32A, B, D</figureCitation>
) median lobe in dorsal view narrowed in api
<pageBreakToken pageId="58" pageNumber="59" start="start">cal</pageBreakToken>
1/4, shortly rounded apically, in lateral view apex of median lobe strongly curved dorsally, parameres strongly curved in lateral view after basal 1/3.
</paragraph>
<paragraph pageId="58" pageNumber="59">
Female (Fig.
<figureCitation captionStart="Figure 31" captionStartId="F31" captionText="Figure 31. Dineutus nigrior. A ♀ dorsal habitus B ♀ ventral habitus C ♂ dorsal habitus D ♂ ventral habitus. All scale bars ≈ 2 mm." pageId="58" pageNumber="59">31A-B</figureCitation>
): Size: 11.6-11.7 mm. Body form narrowly oval; elytral apices produced and rounded, with sutural angle produced into a point, apicolateral sinuation strong, elytral striae faint basally, becoming more evident apically and laterally; profemora without sub-apicoventral tooth; protibiae laterally weakly curved, distolateral margin weakly expanded; venter darkly colored, reddish brown to black venter darkly colored, reddish brown to black with mesothoracic and metathoracic legs lighter in color.
</paragraph>
<caption pageId="58" pageNumber="59" start="Figure 31" startId="F31">
<paragraph pageId="58" pageNumber="59">
<emphasis bold="true" pageId="58" pageNumber="59">Figure 31.</emphasis>
<taxonomicName authorityName="Roberts" authorityYear="1895" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus nigrior" order="Coleoptera" pageId="58" pageNumber="59" phylum="Arthropoda" rank="species" species="nigrior">
<emphasis italics="true" pageId="58" pageNumber="59">Dineutus nigrior</emphasis>
</taxonomicName>
.
<emphasis bold="true" pageId="58" pageNumber="59">A</emphasis>
♀ dorsal habitus
<emphasis bold="true" pageId="58" pageNumber="59">B</emphasis>
♀ ventral habitus
<emphasis bold="true" pageId="58" pageNumber="59">C</emphasis>
♂ dorsal habitus
<emphasis bold="true" pageId="58" pageNumber="59">D</emphasis>
♂ ventral habitus. All scale bars ≈ 2 mm.
</paragraph>
</caption>
<caption pageId="58" pageNumber="59" start="Figure 32" startId="F32">
<paragraph pageId="58" pageNumber="59">
<emphasis bold="true" pageId="58" pageNumber="59">Figure 32.</emphasis>
<taxonomicName authorityName="Roberts" authorityYear="1895" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus nigrior" order="Coleoptera" pageId="58" pageNumber="59" phylum="Arthropoda" rank="species" species="nigrior">
<emphasis italics="true" pageId="58" pageNumber="59">Dineutus nigrior</emphasis>
</taxonomicName>
.
<emphasis bold="true" pageId="58" pageNumber="59">A</emphasis>
aedeagus dorsal view
<emphasis bold="true" pageId="58" pageNumber="59">B</emphasis>
aedeagus ventral view
<emphasis bold="true" pageId="58" pageNumber="59">C</emphasis>
♂ mesotarsal claws
<emphasis bold="true" pageId="58" pageNumber="59">D</emphasis>
aedeagus lateral view. Scale bar for
<emphasis bold="true" pageId="58" pageNumber="59">C</emphasis>
≈ 0.10 mm all others ≈ 1 mm.
</paragraph>
</caption>
</subSubSection>
<subSubSection pageId="58" pageNumber="59" type="differential diagnosis">
<paragraph pageId="58" pageNumber="59">Differential diagnosis.</paragraph>
<paragraph pageId="58" pageNumber="59">
This species is unique among all other species of North American
<taxonomicName class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus" order="Coleoptera" pageId="58" pageNumber="59" phylum="Arthropoda" rank="genus">
<emphasis italics="true" pageId="58" pageNumber="59">Dineutus</emphasis>
</taxonomicName>
in the extremely large size and assymetrical nature of the male mesotarsal claws (Fig.
<figureCitation captionStart="Figure 32" captionStartId="F32" captionText="Figure 32. Dineutus nigrior. 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="58" pageNumber="59">32C</figureCitation>
) and the form of male aedeagus (Fig.
<figureCitation captionStart="Figure 32" captionStartId="F32" captionText="Figure 32. Dineutus nigrior. 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="58" pageNumber="59">32A, B, D</figureCitation>
). The species most similar to
<taxonomicName authorityName="Roberts" authorityYear="1895" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus nigrior" order="Coleoptera" pageId="58" pageNumber="59" phylum="Arthropoda" rank="species" species="nigrior">
<emphasis italics="true" pageId="58" pageNumber="59">Dineutus nigrior</emphasis>
</taxonomicName>
are
<taxonomicName baseAuthorityName="Kirby" baseAuthorityYear="1837" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus assimilis" order="Coleoptera" pageId="58" pageNumber="59" phylum="Arthropoda" rank="species" species="assimilis">
<emphasis italics="true" pageId="58" pageNumber="59">Dineutus assimilis</emphasis>
</taxonomicName>
and
<taxonomicName authorityName="Roberts" authorityYear="1895" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus hornii" order="Coleoptera" pageId="58" pageNumber="59" phylum="Arthropoda" rank="species" species="hornii">
<emphasis italics="true" pageId="58" pageNumber="59">Dineutus hornii</emphasis>
</taxonomicName>
, of the two the former most closely resembles
<taxonomicName authorityName="Roberts" authorityYear="1895" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus nigrior" order="Coleoptera" pageId="58" pageNumber="59" phylum="Arthropoda" rank="species" species="nigrior">
<emphasis italics="true" pageId="58" pageNumber="59">Dineutus nigrior</emphasis>
</taxonomicName>
especially the female members of the species. Females of all three species very closely resemble one another and require careful consideration for identification. Males of the species can be fairly readily distinguished externally, and aedeagal dissections can indisputably separate males of the species.
</paragraph>
<paragraph pageId="58" pageNumber="59">
In general males of
<taxonomicName authorityName="Roberts" authorityYear="1895" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus nigrior" order="Coleoptera" pageId="58" pageNumber="59" phylum="Arthropoda" rank="species" species="nigrior">
<emphasis italics="true" pageId="58" pageNumber="59">Dineutus nigrior</emphasis>
</taxonomicName>
can be distinguished from members of
<taxonomicName baseAuthorityName="Kirby" baseAuthorityYear="1837" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus assimilis" order="Coleoptera" pageId="58" pageNumber="59" phylum="Arthropoda" rank="species" species="assimilis">
<emphasis italics="true" pageId="58" pageNumber="59">Dineutus assimilis</emphasis>
</taxonomicName>
and
<taxonomicName authorityName="Roberts" authorityYear="1895" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus hornii" order="Coleoptera" pageId="58" pageNumber="59" phylum="Arthropoda" rank="species" species="hornii">
<emphasis italics="true" pageId="58" pageNumber="59">Dineutus hornii</emphasis>
</taxonomicName>
by size.
<taxonomicName authorityName="Roberts" authorityYear="1895" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus nigrior" order="Coleoptera" pageId="58" pageNumber="59" phylum="Arthropoda" rank="species" species="nigrior">
<emphasis italics="true" pageId="58" pageNumber="59">Dineutus nigrior</emphasis>
</taxonomicName>
males are larger (Size: 11.1-11.7 mm) than males of both
<taxonomicName baseAuthorityName="Kirby" baseAuthorityYear="1837" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus assimilis" order="Coleoptera" pageId="58" pageNumber="59" phylum="Arthropoda" rank="species" species="assimilis">
<emphasis italics="true" pageId="58" pageNumber="59">Dineutus assimilis</emphasis>
</taxonomicName>
and
<taxonomicName authorityName="Roberts" authorityYear="1895" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus hornii" order="Coleoptera" pageId="58" pageNumber="59" phylum="Arthropoda" rank="species" species="hornii">
<emphasis italics="true" pageId="58" pageNumber="59">Dineutus hornii</emphasis>
</taxonomicName>
.
<taxonomicName authorityName="Roberts" authorityYear="1895" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus nigrior" order="Coleoptera" pageId="58" pageNumber="59" phylum="Arthropoda" rank="species" species="nigrior">
<emphasis italics="true" pageId="58" pageNumber="59">Dineutus nigrior</emphasis>
</taxonomicName>
males differ from males of
<taxonomicName authorityName="Roberts" authorityYear="1895" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus hornii" order="Coleoptera" pageId="58" pageNumber="59" phylum="Arthropoda" rank="species" species="hornii">
<emphasis italics="true" pageId="58" pageNumber="59">Dineutus hornii</emphasis>
</taxonomicName>
in having the sutural angle of the elytral apices produced into a point, and the venter of
<taxonomicName authorityName="Roberts" authorityYear="1895" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus nigrior" order="Coleoptera" pageId="58" pageNumber="59" phylum="Arthropoda" rank="species" species="nigrior">
<emphasis italics="true" pageId="58" pageNumber="59">Dineutus nigrior</emphasis>
</taxonomicName>
is much more darkly colored than that of
<taxonomicName authorityName="Roberts" authorityYear="1895" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus hornii" order="Coleoptera" pageId="58" pageNumber="59" phylum="Arthropoda" rank="species" species="hornii">
<emphasis italics="true" pageId="58" pageNumber="59">Dineutus hornii</emphasis>
</taxonomicName>
, with the epipleura being similarly colored as the thoracic ventrites. Males of
<taxonomicName authorityName="Roberts" authorityYear="1895" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus nigrior" order="Coleoptera" pageId="58" pageNumber="59" phylum="Arthropoda" rank="species" species="nigrior">
<emphasis italics="true" pageId="58" pageNumber="59">Dineutus nigrior</emphasis>
</taxonomicName>
can be distinguished from both
<taxonomicName baseAuthorityName="Kirby" baseAuthorityYear="1837" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus assimilis" order="Coleoptera" pageId="58" pageNumber="59" phylum="Arthropoda" rank="species" species="assimilis">
<emphasis italics="true" pageId="58" pageNumber="59">Dineutus assimilis</emphasis>
</taxonomicName>
and
<taxonomicName authorityName="Roberts" authorityYear="1895" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus hornii" order="Coleoptera" pageId="58" pageNumber="59" phylum="Arthropoda" rank="species" species="hornii">
<emphasis italics="true" pageId="58" pageNumber="59">Dineutus hornii</emphasis>
</taxonomicName>
in having the mesotarsal claws markedly asymmetrical (Fig.
<figureCitation captionStart="Figure 32" captionStartId="F32" captionText="Figure 32. Dineutus nigrior. 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="58" pageNumber="59">32C</figureCitation>
) with the anterior tarsal claw being larger than the posterior claw, while in both
<taxonomicName baseAuthorityName="Kirby" baseAuthorityYear="1837" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus assimilis" order="Coleoptera" pageId="58" pageNumber="59" phylum="Arthropoda" rank="species" species="assimilis">
<emphasis italics="true" pageId="58" pageNumber="59">Dineutus assimilis</emphasis>
</taxonomicName>
(Fig.
<figureCitation captionStart="Figure 9" captionStartId="F9" captionText="Figure 9. Dineutus assimilis. 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="58" pageNumber="59">9C</figureCitation>
) and in
<taxonomicName authorityName="Roberts" authorityYear="1895" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus hornii" order="Coleoptera" pageId="58" pageNumber="59" phylum="Arthropoda" rank="species" species="hornii">
<emphasis italics="true" pageId="58" pageNumber="59">Dineutus hornii</emphasis>
</taxonomicName>
(Fig.
<figureCitation captionStart="Figure 19" captionStartId="F19" captionText="Figure 19. Dineutus hornii. 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="58" pageNumber="59">19C</figureCitation>
) the mesotarsal claws are similar in size. The distolateral margin of the protibiae in
<taxonomicName authorityName="Roberts" authorityYear="1895" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus nigrior" order="Coleoptera" pageId="58" pageNumber="59" phylum="Arthropoda" rank="species" species="nigrior">
<emphasis italics="true" pageId="58" pageNumber="59">Dineutus nigrior</emphasis>
</taxonomicName>
is produced while in
<taxonomicName baseAuthorityName="Kirby" baseAuthorityYear="1837" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus assimilis" order="Coleoptera" pageId="58" pageNumber="59" phylum="Arthropoda" rank="species" species="assimilis">
<emphasis italics="true" pageId="58" pageNumber="59">Dineutus assimilis</emphasis>
</taxonomicName>
and
<taxonomicName authorityName="Roberts" authorityYear="1895" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus hornii" order="Coleoptera" pageId="58" pageNumber="59" phylum="Arthropoda" rank="species" species="hornii">
<emphasis italics="true" pageId="58" pageNumber="59">Dineutus hornii</emphasis>
</taxonomicName>
the margin is straight or nearly so. The aedeagus of
<taxonomicName authorityName="Roberts" authorityYear="1895" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus nigrior" order="Coleoptera" pageId="58" pageNumber="59" phylum="Arthropoda" rank="species" species="nigrior">
<emphasis italics="true" pageId="58" pageNumber="59">Dineutus nigrior</emphasis>
</taxonomicName>
(Fig.
<figureCitation captionStart="Figure 32" captionStartId="F32" captionText="Figure 32. Dineutus nigrior. 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="58" pageNumber="59">32A</figureCitation>
) is most similar to
<taxonomicName authorityName="Roberts" authorityYear="1895" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus hornii" order="Coleoptera" pageId="58" pageNumber="59" phylum="Arthropoda" rank="species" species="hornii">
<emphasis italics="true" pageId="58" pageNumber="59">Dineutus hornii</emphasis>
</taxonomicName>
(Fig.
<figureCitation captionStart="Figure 19" captionStartId="F19" captionText="Figure 19. Dineutus hornii. 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="58" pageNumber="59">19A</figureCitation>
) but can be distinguished from
<taxonomicName authorityName="Roberts" authorityYear="1895" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus hornii" order="Coleoptera" pageId="58" pageNumber="59" phylum="Arthropoda" rank="species" species="hornii">
<emphasis italics="true" pageId="58" pageNumber="59">Dineutus hornii</emphasis>
</taxonomicName>
in having the apex of the median lobe strongly curved dorsally in lateral view (Fig.
<figureCitation captionStart="Figure 32" captionStartId="F32" captionText="Figure 32. Dineutus nigrior. 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="58" pageNumber="59">32D</figureCitation>
).
</paragraph>
<paragraph pageId="58" pageNumber="59">
The females of
<taxonomicName authorityName="Roberts" authorityYear="1895" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus nigrior" order="Coleoptera" pageId="58" pageNumber="59" phylum="Arthropoda" rank="species" species="nigrior">
<emphasis italics="true" pageId="58" pageNumber="59">Dineutus nigrior</emphasis>
</taxonomicName>
are also generally larger (Size: 11.6-11.7 mm) than those of
<taxonomicName baseAuthorityName="Kirby" baseAuthorityYear="1837" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus assimilis" order="Coleoptera" pageId="58" pageNumber="59" phylum="Arthropoda" rank="species" species="assimilis">
<emphasis italics="true" pageId="58" pageNumber="59">Dineutus assimilis</emphasis>
</taxonomicName>
and
<taxonomicName authorityName="Roberts" authorityYear="1895" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus hornii" order="Coleoptera" pageId="58" pageNumber="59" phylum="Arthropoda" rank="species" species="hornii">
<emphasis italics="true" pageId="58" pageNumber="59">Dineutus hornii</emphasis>
</taxonomicName>
, but unlike the case in the males, females of each of these three species have the sutural angles of the elytra produced into a point. However, the shape of the apices differs between them. In females of
<taxonomicName authorityName="Roberts" authorityYear="1895" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus nigrior" order="Coleoptera" pageId="58" pageNumber="59" phylum="Arthropoda" rank="species" species="nigrior">
<emphasis italics="true" pageId="58" pageNumber="59">Dineutus nigrior</emphasis>
</taxonomicName>
the apices of the elytra are regularly rounded, and this situation is most different from
<taxonomicName authorityName="Roberts" authorityYear="1895" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus hornii" order="Coleoptera" pageId="58" pageNumber="59" phylum="Arthropoda" rank="species" species="hornii">
<emphasis italics="true" pageId="58" pageNumber="59">Dineutus hornii</emphasis>
</taxonomicName>
where the apices are generally angled towards the sutural production.
<taxonomicName authorityName="Roberts" authorityYear="1895" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus nigrior" order="Coleoptera" pageId="58" pageNumber="59" phylum="Arthropoda" rank="species" species="nigrior">
<emphasis italics="true" pageId="58" pageNumber="59">Dineutus nigrior</emphasis>
</taxonomicName>
females can be separated from both
<taxonomicName baseAuthorityName="Kirby" baseAuthorityYear="1837" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus assimilis" order="Coleoptera" pageId="58" pageNumber="59" phylum="Arthropoda" rank="species" species="assimilis">
<emphasis italics="true" pageId="58" pageNumber="59">Dineutus assimilis</emphasis>
</taxonomicName>
and from
<taxonomicName authorityName="Roberts" authorityYear="1895" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus hornii" order="Coleoptera" pageId="58" pageNumber="59" phylum="Arthropoda" rank="species" species="hornii">
<emphasis italics="true" pageId="58" pageNumber="59">Dineutus hornii</emphasis>
</taxonomicName>
in having the distolateral protibial margin produced, similar to the condition in males, but more weakly expanded.
</paragraph>
</subSubSection>
<subSubSection lastPageId="59" lastPageNumber="60" pageId="58" pageNumber="59" type="distribution">
<paragraph pageId="58" pageNumber="59">Distribution</paragraph>
<paragraph lastPageId="59" lastPageNumber="60" pageId="58" pageNumber="59">
<emphasis bold="true" pageId="58" pageNumber="59">
(Fig.
<figureCitation captionStart="Figure 52" captionStartId="F52" captionText="Figure 52. General distribution map. A Dineutus assimilis B Dineutus hornii C Dineutus nigrior D Dineutus discolor and Dineutus angustus." pageId="58" pageNumber="59">52C</figureCitation>
).
</emphasis>
Extreme southeastern Canada from Manitoba to Nova Scotia (
<bibRefCitation author="Majka, CG" journalOrPublisher="Zookeys" pageId="94" pageNumber="95" pagination="239 - 260" publicationUrl="10.3897/zookeys.22.216" refId="B75" refString="Majka, CG, 2008. The aquatic Coleoptera of Prince Edward Island, Canada: new records and faunal composition. Zookeys 2: 239 - 260, DOI: 10.3897/zookeys.22.216" title="The aquatic Coleoptera of Prince Edward Island, Canada: new records and faunal composition." url="10.3897/zookeys.22.216" volume="2" year="2008">Majka 2008</bibRefCitation>
;
<bibRefCitation author="Majka, CG" journalOrPublisher="Zookeys" pageId="94" pageNumber="95" pagination="355 - 372" refId="B76" refString="Majka, CG, Kenner, RD, 2009. The Gyrinidae (Coleoptera) of the Maritime Provinces of Canada: new records, distribution, and faunal composition. Zookeys 22: 355 - 372" title="The Gyrinidae (Coleoptera) of the Maritime Provinces of Canada: new records, distribution, and faunal composition." volume="22" year="2009">Majka and Kenner 2009</bibRefCitation>
;
<bibRefCitation author="Roughley, RE" journalOrPublisher="Agricultural Canada, Ottawa, Ontario" pageId="96" pageNumber="97" publicationUrl="http://www.canacoll.org/Coleo/Checklist/PDF%20files/GYRINIDAE.pdf" refId="B115" refString="Roughley, RE, 1991. Checklist of Beetles of Canada and Alaska. Agricultural Canada, Ottawa, Ontario, http://www.canacoll.org/Coleo/Checklist/PDF%20files/GYRINIDAE.pdf" title="Checklist of Beetles of Canada and Alaska" url="http://www.canacoll.org/Coleo/Checklist/PDF%20files/GYRINIDAE.pdf" year="1991">Roughley 1991</bibRefCitation>
) and most of the eastern half of the United States as far south as northern Florida (
<bibRefCitation author="Epler, JH" journalOrPublisher="Bureau of Water Resource Protection, Florida Department of Environmental Protection, Tallahassee" pageId="91" pageNumber="92" refId="B18" refString="Epler, JH, 2010. The Water Beetles of Florida - an identification manual for the families Chrysomelidae, Curculionidae, Dryopidae, Dytiscidae, Elmidae, Gyrinidae, Haliplidae, Helophoridae, Hydraenidae, Hydrochidae, Hydrophilidae, Noteridae, Psephenidae, Ptilodactylidae and Scirtidae." title="The Water Beetles of Florida - an identification manual for the families Chrysomelidae, Curculionidae, Dryopidae, Dytiscidae, Elmidae, Gyrinidae, Haliplidae, Helophoridae, Hydraenidae, Hydrochidae, Hydrophilidae, Noteridae, Psephenidae, Ptilodactylidae and Scirtidae" year="2010">Epler 2010</bibRefCitation>
;
<bibRefCitation author="Folkerts, GW" journalOrPublisher="The Coleopterists Bulletin" pageId="91" pageNumber="92" pagination="345 - 347" refId="B27" refString="Folkerts, GW, 1978. A preliminary checklist of the Hydradephaga (Coleoptera) of Alabama. The Coleopterists Bulletin 32: 345 - 347" title="A preliminary checklist of the Hydradephaga (Coleoptera) of Alabama." volume="32" year="1978">Folkerts 1978</bibRefCitation>
;
<bibRefCitation author="Gordon, RD" journalOrPublisher="North Dakota Insects" pageId="91" pageNumber="92" pagination="1 - 53" refId="B35" refString="Gordon, RD, Post, RL, 1965. North Dakota water beetles. North Dakota Insects 5: 1 - 53" title="North Dakota water beetles." volume="5" year="1965">
<pageBreakToken pageId="59" pageNumber="60" start="start">Gordon</pageBreakToken>
and Post 1965
</bibRefCitation>
;
<bibRefCitation author="Hilsenhoff, WL" journalOrPublisher="Great Lakes Entomologist" pageId="92" pageNumber="93" pagination="77 - 92" refId="B45" refString="Hilsenhoff, WL, 1990. Gyrinidae of Wisconsin, with a key to adults of both sexes and notes on distribution and habitat. Great Lakes Entomologist 23: 77 - 92" title="Gyrinidae of Wisconsin, with a key to adults of both sexes and notes on distribution and habitat." volume="23" year="1990">Hilsenhoff 1990</bibRefCitation>
;
<bibRefCitation author="Malcolm, SE" journalOrPublisher="University of Maine Life Science and Agricultural Experiment Station Technical Bulletin" pageId="94" pageNumber="95" pagination="1 - 49" refId="B77" refString="Malcolm, SE, 1971. The water beetles of Maine: including the families Gyrinidae, Haliplidae, Dytiscidae, Noteridae and Hydrophilidae. University of Maine Life Science and Agricultural Experiment Station Technical Bulletin 48: 1 - 49" title="The water beetles of Maine: including the families Gyrinidae, Haliplidae, Dytiscidae, Noteridae and Hydrophilidae." volume="48" year="1971">Malcolm 1971</bibRefCitation>
;
<bibRefCitation author="Regimbart, M" journalOrPublisher="Annales de la Societe entomologique de France" pageId="95" pageNumber="96" pagination="663 - 737" refId="B106" refString="Regimbart, M, 1907. Essai monographique de la famille des Gyrinidae. 3e supplement. Annales de la Societe entomologique de France 76: 663 - 737" title="Essai monographique de la famille des Gyrinidae. 3 e supplement." volume="76" year="1907">
<normalizedToken originalValue="Régimbart">Regimbart</normalizedToken>
1907
</bibRefCitation>
;
<bibRefCitation author="Roberts, CH" journalOrPublisher="Transactions of the American Entomological Society" pageId="95" pageNumber="96" pagination="279 - 288" refId="B107" refString="Roberts, CH, 1895. The species of Dineutes of America north of Mexico. Transactions of the American Entomological Society 22: 279 - 288" title="The species of Dineutes of America north of Mexico." volume="22" year="1895">Roberts 1895</bibRefCitation>
;
<bibRefCitation author="Sanderson, MW" journalOrPublisher="Aquatic Insects and Oligochaetes of North and South Carolina" pageId="96" pageNumber="97" pagination="10.29 - 10.38" refId="B116" refString="Sanderson, MW, 1982. . Aquatic Insects and Oligochaetes of North and South Carolina Ill: 10.29 - 10.38" volume="Ill" year="1982">Sanderson 1982</bibRefCitation>
;
<bibRefCitation author="Whiteman, NK" journalOrPublisher="Transactions of the American Entomological Society" pageId="96" pageNumber="97" pagination="185 - 243" refId="B128" refString="Whiteman, NK, Sites, RW, 2003. Lentic beetles of the Missouri Prairie Region: habitat and regional associations, with keys to the Hydradephaga. Transactions of the American Entomological Society 129: 185 - 243" title="Lentic beetles of the Missouri Prairie Region: habitat and regional associations, with keys to the Hydradephaga." volume="129" year="2003">Whiteman and Sites 2003</bibRefCitation>
;
<bibRefCitation author="Wood, FE" journalOrPublisher="University of Missouri, Columbia, Missouri" pageId="97" pageNumber="98" refId="B130" refString="Wood, FE, 1962. A synopsis of the genus Dineutus (Coleoptera: Gyrinidae) in the Western Hemisphere. University of Missouri, Columbia, Missouri" title="A synopsis of the genus Dineutus (Coleoptera: Gyrinidae) in the Western Hemisphere" year="1962">Wood 1962</bibRefCitation>
).
</paragraph>
</subSubSection>
<subSubSection pageId="59" pageNumber="60" type="habitat">
<paragraph pageId="59" pageNumber="60">Habitat.</paragraph>
<paragraph pageId="59" pageNumber="60">
Primarily lentic species, found only infrequently in streams (
<bibRefCitation author="Roberts, CH" journalOrPublisher="Transactions of the American Entomological Society" pageId="95" pageNumber="96" pagination="279 - 288" refId="B107" refString="Roberts, CH, 1895. The species of Dineutes of America north of Mexico. Transactions of the American Entomological Society 22: 279 - 288" title="The species of Dineutes of America north of Mexico." volume="22" year="1895">Roberts 1895</bibRefCitation>
;
<bibRefCitation author="Hilsenhoff, WL" journalOrPublisher="Great Lakes Entomologist" pageId="92" pageNumber="93" pagination="77 - 92" refId="B45" refString="Hilsenhoff, WL, 1990. Gyrinidae of Wisconsin, with a key to adults of both sexes and notes on distribution and habitat. Great Lakes Entomologist 23: 77 - 92" title="Gyrinidae of Wisconsin, with a key to adults of both sexes and notes on distribution and habitat." volume="23" year="1990">Hilsenhoff 1990</bibRefCitation>
). In Canada,
<taxonomicName authorityName="Roberts" authorityYear="1895" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus nigrior" order="Coleoptera" pageId="59" pageNumber="60" phylum="Arthropoda" rank="species" species="nigrior">
<emphasis italics="true" pageId="59" pageNumber="60">Dineutus nigrior</emphasis>
</taxonomicName>
prefers semi-boggy lakes (
<bibRefCitation author="Morrissette, R" journalOrPublisher="Fabreries" pageId="94" pageNumber="95" pagination="51 - 58" refId="B83" refString="Morrissette, R, 1979. Les Gyrinidae (Coleoptera) du Quebec. Fabreries 5: 51 - 58" title="Les Gyrinidae (Coleoptera) du Quebec." volume="5" year="1979">Morrissette 1979</bibRefCitation>
). In the Missouri Prairie Region,
<bibRefCitation author="Whiteman, NK" journalOrPublisher="Transactions of the American Entomological Society" pageId="96" pageNumber="97" pagination="185 - 243" refId="B128" refString="Whiteman, NK, Sites, RW, 2003. Lentic beetles of the Missouri Prairie Region: habitat and regional associations, with keys to the Hydradephaga. Transactions of the American Entomological Society 129: 185 - 243" title="Lentic beetles of the Missouri Prairie Region: habitat and regional associations, with keys to the Hydradephaga." volume="129" year="2003">Whiteman and Sites (2003)</bibRefCitation>
found this species associated with the plant taxa
<taxonomicName genus="Brasneia" lsidName="Brasneia" pageId="59" pageNumber="60" rank="genus">
<emphasis italics="true" pageId="59" pageNumber="60">Brasneia</emphasis>
</taxonomicName>
and
<taxonomicName class="Dicotyledoneae" family="Fabaceae" genus="Lespedeza" higherTaxonomySource="GBIF" kingdom="Plantae" lsidName="Lespedeza" order="Rosales" pageId="59" pageNumber="60" phylum="Angiospermae" rank="genus">
<emphasis italics="true" pageId="59" pageNumber="60">Lespedeza</emphasis>
</taxonomicName>
.
</paragraph>
</subSubSection>
<subSubSection pageId="59" pageNumber="60" type="discussion">
<paragraph pageId="59" pageNumber="60">Discussion.</paragraph>
<paragraph pageId="59" pageNumber="60">
<bibRefCitation author="Fitzgerald, VJ" journalOrPublisher="American Midland Naturalist" pageId="91" pageNumber="92" pagination="439 - 448" publicationUrl="10.2307/2425801" refId="B26" refString="Fitzgerald, VJ, 1987. Social behavior of adult whirligig beetles (Dineutus nigrior and D. discolor) (Coleoptera: Gyrinidae). American Midland Naturalist 118: 439 - 448, DOI: 10.2307/2425801" title="Social behavior of adult whirligig beetles (Dineutus nigrior and D. discolor) (Coleoptera: Gyrinidae)." url="10.2307/2425801" volume="118" year="1987">Fitzgerald (1987)</bibRefCitation>
described the social system of
<taxonomicName authorityName="Roberts" authorityYear="1895" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus nigrior" order="Coleoptera" pageId="59" pageNumber="60" phylum="Arthropoda" rank="species" species="nigrior">
<emphasis italics="true" pageId="59" pageNumber="60">Dineutus nigrior</emphasis>
</taxonomicName>
in detail and
<bibRefCitation author="Fairn, ER" journalOrPublisher="Ecoscience" pageId="91" pageNumber="92" pagination="327 - 331" publicationUrl="10.2980/15-3-3134" refId="B21" refString="Fairn, ER, Schulte-Hostedde, AI, Alarie, Y, 2008. Water mite parasitism is associated with body condition and sex of the whirligig beetle Dineutus nigrior (Coleoptera: Gyrinidae). Ecoscience 15: 327 - 331, DOI: 10.2980/15-3-3134" title="Water mite parasitism is associated with body condition and sex of the whirligig beetle Dineutus nigrior (Coleoptera: Gyrinidae)." url="10.2980/15-3-3134" volume="15" year="2008">Fairn et al. (2008)</bibRefCitation>
studied the effects of parasitism by larval water mites of the genus
<taxonomicName class="Arachnida" family="Eylaidae" genus="Eylais" higherTaxonomySource="GBIF" kingdom="Animalia" lsidName="Eylais" order="Actinedida" pageId="59" pageNumber="60" phylum="Arthropoda" rank="genus">
<emphasis italics="true" pageId="59" pageNumber="60">Eylais</emphasis>
</taxonomicName>
Latreille, 1796 on adults of
<taxonomicName authorityName="Roberts" authorityYear="1895" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus nigrior" order="Coleoptera" pageId="59" pageNumber="60" phylum="Arthropoda" rank="species" species="nigrior">
<emphasis italics="true" pageId="59" pageNumber="60">Dineutus nigrior</emphasis>
</taxonomicName>
. Evidence for sexual selection within this species has also been investigated (
<bibRefCitation author="Fairn, ER" journalOrPublisher="Coleopterists Bulletin" pageId="91" pageNumber="92" pagination="113 - 120" publicationUrl="10.1649/927.1" refId="B19" refString="Fairn, ER, Alarie, Y, Schulte-Hostedde, AI, 2007a. Sexual size and shape dimorphism in Dineutus nigrior (Coleoptera: Gyrinidae). Coleopterists Bulletin 61: 113 - 120, DOI: 10.1649/927.1" title="Sexual size and shape dimorphism in Dineutus nigrior (Coleoptera: Gyrinidae)." url="10.1649/927.1" volume="61" year="2007 a">Fairn et al. 2007a</bibRefCitation>
;
<bibRefCitation author="Fairn, ER" journalOrPublisher="Ethology" pageId="91" pageNumber="92" pagination="257 - 266" publicationUrl="10.1111/j.1439-0310.2006.01315.x" refId="B20" refString="Fairn, ER, Schulte-Hostedde, AI, Alarie, Y, 2007b. Sexual selection on accessory glands, genitalia and protarsal pads in the whirligig beetle Dineutus nigrior Roberts (Coleoptera: Gyrinidae). Ethology 113: 257 - 266, DOI: 10.1111/j.1439-0310.2006.01315.x" title="Sexual selection on accessory glands, genitalia and protarsal pads in the whirligig beetle Dineutus nigrior Roberts (Coleoptera: Gyrinidae)." url="10.1111/j.1439-0310.2006.01315.x" volume="113" year="2007 b">Fairn et al. 2007b</bibRefCitation>
). Brief life history information is available in
<bibRefCitation author="Istock, C" journalOrPublisher="Evolution" pageId="92" pageNumber="93" pagination="211 - 234" publicationUrl="10.2307/2406575" refId="B49" refString="Istock, C, 1966. Distribution, coexistence, and competition of whirligig beetles. Evolution 20: 211 - 234, DOI: 10.2307/2406575" title="Distribution, coexistence, and competition of whirligig beetles." url="10.2307/2406575" volume="20" year="1966">Istock (1966</bibRefCitation>
;
<bibRefCitation author="Istock, C" journalOrPublisher="Ecology" pageId="92" pageNumber="93" pagination="929 - 937" publicationUrl="10.2307/1934536" refId="B50" refString="Istock, C, 1967. Transient competitive displacement in natural populations of whirligig beetles. Ecology 48: 929 - 937, DOI: 10.2307/1934536" title="Transient competitive displacement in natural populations of whirligig beetles." url="10.2307/1934536" volume="48" year="1967">1967</bibRefCitation>
).
</paragraph>
<paragraph pageId="59" pageNumber="60">
Key to the larvae of
<taxonomicName authorityName="Roberts" authorityYear="1895" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus nigrior" order="Coleoptera" pageId="59" pageNumber="60" phylum="Arthropoda" rank="species" species="nigrior">
<emphasis italics="true" pageId="59" pageNumber="60">Dineutus nigrior</emphasis>
</taxonomicName>
provided by
<bibRefCitation author="Hatch, MH" journalOrPublisher="Bulletin of the Brooklyn Entomological Society" pageId="92" pageNumber="93" pagination="27 - 28" refId="B43" refString="Hatch, MH, 1927. Notes on the biology of Dineutus (Gyrinidae). Bulletin of the Brooklyn Entomological Society 22: 27 - 28" title="Notes on the biology of Dineutus (Gyrinidae)." volume="22" year="1927">Hatch (1927)</bibRefCitation>
.
</paragraph>
</subSubSection>
</treatment>
</document>