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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="91F9C3AA57AE868A750EFEFBA98BF0F6" 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 amazonicus Hatch 1930" docType="treatment" docVersion="5" id="FC4DC947FF97FF86190BFFD8B82CAB56" lastPageNumber="21" masterDocId="FC4DC947FF97FF86190BFFD8B82CAB56" masterDocTitle="The New World whirligig beetles of the genus Dineutus Macleay, 1825 (Coleoptera, Gyrinidae, Gyrininae, Dineutini)" masterLastPageNumber="135" masterPageNumber="1" pageNumber="20" updateTime="1668159852297" updateUser="ExternalLinkService">
<mods:mods xmlns:mods="http://www.loc.gov/mods/v3">
<mods:titleInfo>
<mods:title>The New World whirligig beetles of the genus Dineutus Macleay, 1825 (Coleoptera, Gyrinidae, Gyrininae, Dineutini)</mods:title>
</mods:titleInfo>
<mods:name type="personal">
<mods:role>
<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>
</mods:role>
<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>
</mods:name>
<mods:typeOfResource>text</mods:typeOfResource>
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<mods:titleInfo>
<mods:title>ZooKeys</mods:title>
</mods:titleInfo>
<mods:part>
<mods:date>2015</mods:date>
<mods:detail type="pubDate">
<mods:number>2015-01-23</mods:number>
</mods:detail>
<mods:detail type="volume">
<mods:number>476</mods:number>
</mods:detail>
<mods:extent unit="page">
<mods:start>1</mods:start>
<mods:end>135</mods:end>
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<mods:location>
<mods:url>http://dx.doi.org/10.3897/zookeys.476.8630</mods:url>
</mods:location>
<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>
<mods:identifier type="Pensoft-UUID">FC4DC947FF97FF86190BFFD8B82CAB56</mods:identifier>
<mods:identifier type="Zenodo-Dep">578702</mods:identifier>
</mods:mods>
<treatment ID-GBIF-Taxon="152057927" LSID="urn:lsid:plazi:treatment:91F9C3AA57AE868A750EFEFBA98BF0F6" httpUri="http://treatment.plazi.org/id/91F9C3AA57AE868A750EFEFBA98BF0F6" lastPageId="20" lastPageNumber="21" pageId="19" pageNumber="20">
<subSubSection pageId="19" pageNumber="20" type="nomenclature">
<paragraph pageId="19" pageNumber="20">
<taxonomicName LSID="91F9C3AA-57AE-868A-750E-FEFBA98BF0F6" authority="Hatch, 1930" authorityName="Hatch" authorityYear="1930" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus amazonicus" order="Coleoptera" pageId="19" pageNumber="20" phylum="Arthropoda" rank="species" species="amazonicus">Dineutus amazonicus Hatch, 1930</taxonomicName>
</paragraph>
</subSubSection>
<subSubSection pageId="19" pageNumber="20" type="reference_group">
<paragraph pageId="19" pageNumber="20">
<taxonomicName authorityName="Hatch" authorityYear="1930" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus (Cyclinus) amazonicus" order="Coleoptera" pageId="19" pageNumber="20" phylum="Arthropoda" rank="species" species="amazonicus" subGenus="Cyclinus">Dineutus (Cyclinus) amazonicus</taxonomicName>
Hatch, 1930: 16.
</paragraph>
</subSubSection>
<subSubSection pageId="19" pageNumber="20" type="type locality">
<paragraph pageId="19" pageNumber="20">Type locality.</paragraph>
<paragraph pageId="19" pageNumber="20">U.S.A., Arkansas, &quot;Sevier Co., Ark. Saline R. about 18 miles east of DeQueen.&quot;</paragraph>
</subSubSection>
<subSubSection pageId="19" pageNumber="20" type="material examined">
<paragraph pageId="19" pageNumber="20">Material examined.</paragraph>
<paragraph pageId="19" pageNumber="20">None-see comments below in Discussion.</paragraph>
</subSubSection>
<subSubSection pageId="20" pageNumber="21" type="diagnosis">
<paragraph pageId="20" pageNumber="21">
<pageBreakToken pageId="20" pageNumber="21" start="start">Diagnosis</pageBreakToken>
.
</paragraph>
<paragraph pageId="20" pageNumber="21">Male: unknown.</paragraph>
<paragraph pageId="20" pageNumber="21">Female: Length 10 mm, elytral apices regularly oval, serration absent, lateral margins weakly sinuate, profemora of female with apicoventral tooth present running 1/5 its length.</paragraph>
</subSubSection>
<subSubSection pageId="20" pageNumber="21" type="distribution">
<paragraph pageId="20" pageNumber="21">Distribution.</paragraph>
<paragraph pageId="20" pageNumber="21">Known only from the type locality.</paragraph>
</subSubSection>
<subSubSection pageId="20" pageNumber="21" type="habitat">
<paragraph pageId="20" pageNumber="21">Habitat.</paragraph>
<paragraph pageId="20" pageNumber="21">Unknown</paragraph>
</subSubSection>
<subSubSection pageId="20" pageNumber="21" type="discussion">
<paragraph pageId="20" pageNumber="21">Discussion.</paragraph>
<paragraph pageId="20" pageNumber="21">
<taxonomicName authorityName="Hatch" authorityYear="1930" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus amazonicus" order="Coleoptera" pageId="20" pageNumber="21" phylum="Arthropoda" rank="species" species="amazonicus">
<emphasis italics="true" pageId="20" pageNumber="21">Dineutus amazonicus</emphasis>
</taxonomicName>
was described from a single female specimen collected in Arkansas during the 1930's. The species, as described by Hatch (1930), is unique among all other North American
<taxonomicName class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus" order="Coleoptera" pageId="20" pageNumber="21" phylum="Arthropoda" rank="genus">
<emphasis italics="true" pageId="20" pageNumber="21">Dineutus</emphasis>
</taxonomicName>
in having females with an sub-apicoventral tooth present on the profemora, running approximately 1/5 its length. In
<taxonomicName class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus" order="Coleoptera" pageId="20" pageNumber="21" phylum="Arthropoda" rank="genus">
<emphasis italics="true" pageId="20" pageNumber="21">Dineutus</emphasis>
</taxonomicName>
this is a commonly sexually dimorphic character, with the tooth present only in males. Hatch (1930) indicated the elytra of this species are similar to those of
<taxonomicName baseAuthorityName="Say" baseAuthorityYear="1825" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus emarginatus" order="Coleoptera" pageId="20" pageNumber="21" phylum="Arthropoda" rank="species" species="emarginatus">
<emphasis italics="true" pageId="20" pageNumber="21">Dineutus emarginatus</emphasis>
</taxonomicName>
, being regularly rounded and lacking serration.
</paragraph>
<paragraph pageId="20" pageNumber="21">
We were unable to locate the type specimen either at the Smithsonian (F. Shockley, pers. comm.) or Oregon State University (C. Marshall, pers. comm.) where
<normalizedToken originalValue="Hatchs">Hatch's</normalizedToken>
collection was deposited. No specimens in the University of Arkansas collection were identified as
<taxonomicName authorityName="Hatch" authorityYear="1930" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus amazonicus" order="Coleoptera" pageId="20" pageNumber="21" phylum="Arthropoda" rank="species" species="amazonicus">
<emphasis italics="true" pageId="20" pageNumber="21">Dineutus amazonicus</emphasis>
</taxonomicName>
(J. Barnes, pers. comm.). It appears that the type may be missing, and that no other published records of this species have occurred since its description in 1930. Although
<normalizedToken originalValue="Hatchs">Hatch's</normalizedToken>
(1930) description at first sounds dubious, as the profemoral sub-apicoventral tooth is in all other species unique to males, Hatch was unlikely to mistake a female gyrinid for a male (
<bibRefCitation author="Hatch, MH" journalOrPublisher="Papers of the Michigan Academy of Science, Arts and Letters" pageId="92" pageNumber="93" pagination="429 - 467" refId="B41" refString="Hatch, MH, 1925b. The phylogeny and phylogenetic tendencies of Gyrinidae. Papers of the Michigan Academy of Science, Arts and Letters V: 429 - 467" title="The phylogeny and phylogenetic tendencies of Gyrinidae." volume="V" year="1925 b">Hatch 1925b</bibRefCitation>
,
<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">1926</bibRefCitation>
), and it therefore seems unlikely that he described a merely aberrant form. For this reason we have included the enigmatic
<taxonomicName authorityName="Hatch" authorityYear="1930" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus amazonicus" order="Coleoptera" pageId="20" pageNumber="21" phylum="Arthropoda" rank="species" species="amazonicus">
<emphasis italics="true" pageId="20" pageNumber="21">Dineutus amazonicus</emphasis>
</taxonomicName>
, without having seen neither type nor any other specimens of this species.
</paragraph>
<paragraph pageId="20" pageNumber="21">
The first author recently visited the type locality in an attempt to recollect this species, but was unsuccessful. The locality, Saline River, a large mud bottom river, also had present
<taxonomicName baseAuthorityName="Forsberg" baseAuthorityYear="1821" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus ciliatus" order="Coleoptera" pageId="20" pageNumber="21" phylum="Arthropoda" rank="species" species="ciliatus">
<emphasis italics="true" pageId="20" pageNumber="21">Dineutus ciliatus</emphasis>
</taxonomicName>
as described by Hatch (1930), but unsettlingly, the only other species collected at this locality was
<taxonomicName baseAuthorityName="Say" baseAuthorityYear="1825" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus emarginatus" order="Coleoptera" pageId="20" pageNumber="21" phylum="Arthropoda" rank="species" species="emarginatus">
<emphasis italics="true" pageId="20" pageNumber="21">Dineutus emarginatus</emphasis>
</taxonomicName>
, the species stated to be most similar to that of
<taxonomicName authorityName="Hatch" authorityYear="1930" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus amazonicus" order="Coleoptera" pageId="20" pageNumber="21" phylum="Arthropoda" rank="species" species="amazonicus">
<emphasis italics="true" pageId="20" pageNumber="21">Dineutus amazonicus</emphasis>
</taxonomicName>
. Hopefully in the future the type may be rediscovered or this enigmatic species recollected and its relationship with
<taxonomicName baseAuthorityName="Say" baseAuthorityYear="1825" class="Insecta" family="Gyrinidae" genus="Dineutus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Dineutus emarginatus" order="Coleoptera" pageId="20" pageNumber="21" phylum="Arthropoda" rank="species" species="emarginatus">
<emphasis italics="true" pageId="20" pageNumber="21">Dineutus emarginatus</emphasis>
</taxonomicName>
clarified.
</paragraph>
</subSubSection>
</treatment>
</document>