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<mods:title id="B30BC3A4E7D0C41F2E4D399BB8EFAC35">Description of Nilssondytes diversus gen. et sp. nov. from Venezuela (Coleoptera, Adephaga, Dytiscidae, Cybistrinae)</mods:title>
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<mods:namePart id="DFFBCC5FBFB4D6A1680203EA14B65A4B">Miller, Kelly B.</mods:namePart>
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<mods:affiliation id="3E2959F438E3224B181E44D52B131480">Department of Biology and Museum of Southwestern Biology, University of New Mexico, Albuquerque, NM 87131 - 0001, USA</mods:affiliation>
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<mods:namePart id="B416BDB71B9DEE00DFB099F828D14232">Michat, Mariano C.</mods:namePart>
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<mods:affiliation id="97E7A89202636121181EA08C19B98B9B">Instituto de Biodiversidad y Biología Experimental y Aplicada, CONICET-Universidad de Buenos Aires, Buenos Aires, Argentina</mods:affiliation>
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<mods:namePart id="7EC4182DA2C673B50FD4D10284FF8397">Ferreira Jr, Nelson</mods:namePart>
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<mods:affiliation id="43C714F46172E171B3186574F40B7EEE">Laboratório de Entomologia, Departamento de Zoologia, Instituto de Biologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil</mods:affiliation>
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<subSubSection id="8E3D5BF93EC16EC838D545C4CB9402F8" type="nomenclature">
<paragraph id="11C3EFC7395A04E385CB207E7DA0EC11">
<taxonomicName id="87F314603E2D1321AD8CF1EFCC7C5A2B" authorityName="Miller &amp; Michat &amp; Ferreira Jr" authorityYear="2024" class="Insecta" family="Dytiscidae" genus="Nilssondytes" kingdom="Animalia" order="Coleoptera" phylum="Arthropoda" rank="genus" status="gen. nov.">
<emphasis id="8DEE38FA21FD7F37584B8790F975C487" italics="true">Nilssondytes</emphasis>
</taxonomicName>
<taxonomicNameLabel id="C20B9C502E97C31C84800DBD339B167A" rank="genus">gen. nov.</taxonomicNameLabel>
</paragraph>
</subSubSection>
<subSubSection id="7464E6DB721D017E9797668216A8D573" type="description">
<paragraph id="855C336098E70FC53CB9A3019542FEAC">
<figureCitation id="58C8D1384AF6BF66718FB1FD55E5ADE6" captionStart="Figures 110" captionStartId="F1" captionText="Figures 110. Nilssondytes diversus sp. nov. 1 dorsal habitus 2, 3 metatarsal claws, posterior aspect: 2 male 3 female 4 prosternal process, ventral aspect 5 right mesothoracic leg, posterior aspect 68 male genitalia: 6 median lobe, ventral aspect 7 median lobe, right lateral aspect 8 right lateral lobe, right lateral aspect 9 female genitalia (gonocoxae, laterotergites, right gonocoxosternite and internal genitalia), ventral aspect 10 male sternite IX, ventral aspect. Scale bars: 5.0 mm (1); 1.0 mm (25, 9, 10)" figureDoi="10.3897/zookeys.1210.124121.figures1-10" httpUri="https://binary.pensoft.net/fig/1123261">Figs 110</figureCitation>
,
<figureCitation id="3C64A6D8D36AEC7453A8F73295E978D8" captionStart="Figure 11" captionStartId="F2" captionText="Figure 11. Distribution of Nilssondytes diversus sp. nov. in northern South America." figureDoi="10.3897/zookeys.1210.124121.figure11" httpUri="https://binary.pensoft.net/fig/1123262">11</figureCitation>
</paragraph>
</subSubSection>
<subSubSection id="SECID0E5IAC" type="remarks">
<paragraph id="B238A523B60ADD2BEDA4E6A895F7E184">
<heading id="801E9CF72D75D1E70DA10593A4FB5AC3" reason="title">Remark.</heading>
</paragraph>
<paragraph id="CE0A9AFF3E4AE310FD2397033694E931">
The following description is reproduced with some modifications from
<bibRefCitation id="C8BD19A595A6A7C77E8E076783FD6C8C" DOI="10.3897/zookeys.1188.110081" author="Miller KB &amp; Michat MC &amp; Ferreira Jr N" etAl="et al." firstAuthor="Miller" journalOrPublisher="ZooKeys" pagination="125-168" refId="B7" refString="Miller KB, Michat MC, Ferreira Jr N (2024) Reclassification of Cybistrinae Sharp, 1880 in the Neotropical Region (Coleoptera, Adephaga, Dytiscidae), with description of new taxa. ZooKeys 1188: 125168. https://doi.org/10.3897/zookeys.1188.110081" title="Reclassification of Cybistrinae Sharp, 1880 in the Neotropical Region (Coleoptera, Adephaga, Dytiscidae), with description of new taxa." volume="1188" year="2024">Miller et al. (2024)</bibRefCitation>
.
</paragraph>
</subSubSection>
<subSubSection id="SECID0EIJAC" type="type species">
<paragraph id="04D761AE0662DAD2DD86DF94C907BC1A">
<heading id="A6B6014A96387ECAC1F2B59452E30AF9" reason="title">
<typeStatus id="A8B5447C05FFC8587BF8BA7D73FE7DD8">Type</typeStatus>
species.
</heading>
</paragraph>
<paragraph id="7364CBEECF97AD5E31F7E5F366B2916E">
<taxonomicName id="6DE7B8A84DE741E19FF9A46BD8EA212B" authorityName="Miller &amp; Michat &amp; Ferreira Jr" authorityYear="2024" class="Insecta" family="Dytiscidae" genus="Nilssondytes" kingdom="Animalia" order="Coleoptera" phylum="Arthropoda" rank="species" species="diversus" status="sp. nov.">
<emphasis id="161E1EC96612436E14ABA39426D93834" italics="true">Nilssondytes diversus</emphasis>
</taxonomicName>
<taxonomicNameLabel id="BE66AB7116219CBAA13AECBE80B57791" rank="species">sp. nov.</taxonomicNameLabel>
, by current designation.
</paragraph>
</subSubSection>
<subSubSection id="SECID0EZJAC" type="diagnosis">
<paragraph id="47DF0A36E81D0A773AB5DBCEFF4662C2">
<heading id="61E1A9C4C8730261BFD8F0F9382B7148" reason="title">Diagnosis.</heading>
</paragraph>
<paragraph id="C688634125DB7FA986A185D7AFE24820">
From other
<taxonomicName id="5513472B1C6C9FE53F0F9E59C1D9BB3E" authorityName="Sharp" authorityYear="1880" class="Insecta" family="Dytiscidae" kingdom="Animalia" order="Coleoptera" phylum="Arthropoda" rank="subFamily" subFamily="Cybistrinae">Cybistrinae</taxonomicName>
this genus differs in having: (1) the metatibial spurs apically simple, (2) metacoxal lines clearly present, (3) the pronotum and elytron with broad, distinct lateral yellow bands along margins (Fig.
<figureCitation id="61A1795F169B100EEAFD4F042E0D71AF" captionStart="Figures 110" captionStartId="F1" captionText="Figures 110. Nilssondytes diversus sp. nov. 1 dorsal habitus 2, 3 metatarsal claws, posterior aspect: 2 male 3 female 4 prosternal process, ventral aspect 5 right mesothoracic leg, posterior aspect 68 male genitalia: 6 median lobe, ventral aspect 7 median lobe, right lateral aspect 8 right lateral lobe, right lateral aspect 9 female genitalia (gonocoxae, laterotergites, right gonocoxosternite and internal genitalia), ventral aspect 10 male sternite IX, ventral aspect. Scale bars: 5.0 mm (1); 1.0 mm (25, 9, 10)" figureDoi="10.3897/zookeys.1210.124121.figures1-10" httpUri="https://binary.pensoft.net/fig/1123261">1</figureCitation>
), (4) males and females each with two metatarsal claws, the posterior much reduced in both sexes (Figs
<figureCitation id="4997A9C4D85E6F41F35C6523EA94D94D" captionStart="Figures 110" captionStartId="F1" captionText="Figures 110. Nilssondytes diversus sp. nov. 1 dorsal habitus 2, 3 metatarsal claws, posterior aspect: 2 male 3 female 4 prosternal process, ventral aspect 5 right mesothoracic leg, posterior aspect 68 male genitalia: 6 median lobe, ventral aspect 7 median lobe, right lateral aspect 8 right lateral lobe, right lateral aspect 9 female genitalia (gonocoxae, laterotergites, right gonocoxosternite and internal genitalia), ventral aspect 10 male sternite IX, ventral aspect. Scale bars: 5.0 mm (1); 1.0 mm (25, 9, 10)" figureDoi="10.3897/zookeys.1210.124121.figures1-10" httpUri="https://binary.pensoft.net/fig/1123261">2</figureCitation>
,
<figureCitation id="D31A51E2DC18DE65765CB790EECEDB31" captionStart="Figures 110" captionStartId="F1" captionText="Figures 110. Nilssondytes diversus sp. nov. 1 dorsal habitus 2, 3 metatarsal claws, posterior aspect: 2 male 3 female 4 prosternal process, ventral aspect 5 right mesothoracic leg, posterior aspect 68 male genitalia: 6 median lobe, ventral aspect 7 median lobe, right lateral aspect 8 right lateral lobe, right lateral aspect 9 female genitalia (gonocoxae, laterotergites, right gonocoxosternite and internal genitalia), ventral aspect 10 male sternite IX, ventral aspect. Scale bars: 5.0 mm (1); 1.0 mm (25, 9, 10)" figureDoi="10.3897/zookeys.1210.124121.figures1-10" httpUri="https://binary.pensoft.net/fig/1123261">3</figureCitation>
), (5) the prosternum and prosternal process relatively shallowly but distinctly sulcate (Fig.
<figureCitation id="6366D2027585A6B8B7CB470756C2A494" captionStart="Figures 110" captionStartId="F1" captionText="Figures 110. Nilssondytes diversus sp. nov. 1 dorsal habitus 2, 3 metatarsal claws, posterior aspect: 2 male 3 female 4 prosternal process, ventral aspect 5 right mesothoracic leg, posterior aspect 68 male genitalia: 6 median lobe, ventral aspect 7 median lobe, right lateral aspect 8 right lateral lobe, right lateral aspect 9 female genitalia (gonocoxae, laterotergites, right gonocoxosternite and internal genitalia), ventral aspect 10 male sternite IX, ventral aspect. Scale bars: 5.0 mm (1); 1.0 mm (25, 9, 10)" figureDoi="10.3897/zookeys.1210.124121.figures1-10" httpUri="https://binary.pensoft.net/fig/1123261">4</figureCitation>
), (6) the medial margins of the male sternite IX straight, not emarginate (Fig.
<figureCitation id="24F1E526985D1781AA1A1151DCFF6D9E" captionStart="Figures 110" captionStartId="F1" captionText="Figures 110. Nilssondytes diversus sp. nov. 1 dorsal habitus 2, 3 metatarsal claws, posterior aspect: 2 male 3 female 4 prosternal process, ventral aspect 5 right mesothoracic leg, posterior aspect 68 male genitalia: 6 median lobe, ventral aspect 7 median lobe, right lateral aspect 8 right lateral lobe, right lateral aspect 9 female genitalia (gonocoxae, laterotergites, right gonocoxosternite and internal genitalia), ventral aspect 10 male sternite IX, ventral aspect. Scale bars: 5.0 mm (1); 1.0 mm (25, 9, 10)" figureDoi="10.3897/zookeys.1210.124121.figures1-10" httpUri="https://binary.pensoft.net/fig/1123261">10</figureCitation>
), (7) no cluster or line of setae at the apicodorsal angle of the posterior surface of the mesotarsomeres (Fig.
<figureCitation id="C257ABE277F5B178F30742CB7B181AAA" captionStart="Figures 110" captionStartId="F1" captionText="Figures 110. Nilssondytes diversus sp. nov. 1 dorsal habitus 2, 3 metatarsal claws, posterior aspect: 2 male 3 female 4 prosternal process, ventral aspect 5 right mesothoracic leg, posterior aspect 68 male genitalia: 6 median lobe, ventral aspect 7 median lobe, right lateral aspect 8 right lateral lobe, right lateral aspect 9 female genitalia (gonocoxae, laterotergites, right gonocoxosternite and internal genitalia), ventral aspect 10 male sternite IX, ventral aspect. Scale bars: 5.0 mm (1); 1.0 mm (25, 9, 10)" figureDoi="10.3897/zookeys.1210.124121.figures1-10" httpUri="https://binary.pensoft.net/fig/1123261">5</figureCitation>
), and (8) the ventral surface of the metatrochanter with an oblique, transverse groove. The single species in this genus (described below) is somewhat similar in size, shape, and coloration to
<emphasis id="A73A6C51B61FF3A2086C2778C03F957B" italics="true">Metaxydytes laevigatus</emphasis>
(Olivier) and may be present among series of that species in collections.
<taxonomicName id="798DF4B3DE9C7D2E75F2456B9398AB0F" authorityName="Miller &amp; Michat &amp; Ferreira Jr" authorityYear="2024" class="Insecta" family="Dytiscidae" genus="Nilssondytes" kingdom="Animalia" order="Coleoptera" phylum="Arthropoda" rank="genus">
<emphasis id="8B6108793192444D1DB3CB9F06060BD2" italics="true">Nilssondytes</emphasis>
</taxonomicName>
differ from
<emphasis id="B535DC21BD32890260ED78288CB2D2CD" italics="true">M. laevigatus</emphasis>
in several features (see above) including the presence of yellow lateral elytral margins (Fig.
<figureCitation id="0DC0677C20CDA3C303DD1A63FFA79180" captionStart="Figures 110" captionStartId="F1" captionText="Figures 110. Nilssondytes diversus sp. nov. 1 dorsal habitus 2, 3 metatarsal claws, posterior aspect: 2 male 3 female 4 prosternal process, ventral aspect 5 right mesothoracic leg, posterior aspect 68 male genitalia: 6 median lobe, ventral aspect 7 median lobe, right lateral aspect 8 right lateral lobe, right lateral aspect 9 female genitalia (gonocoxae, laterotergites, right gonocoxosternite and internal genitalia), ventral aspect 10 male sternite IX, ventral aspect. Scale bars: 5.0 mm (1); 1.0 mm (25, 9, 10)" figureDoi="10.3897/zookeys.1210.124121.figures1-10" httpUri="https://binary.pensoft.net/fig/1123261">1</figureCitation>
) which are absent in
<emphasis id="BFC316B7EA4BDF311A3EA3AC540AD94F" italics="true">M. laevigatus</emphasis>
. Larvae are unknown.
</paragraph>
</subSubSection>
<subSubSection id="SECID0EIMAC" type="etymology">
<paragraph id="7EE9CC2E76716B8A5DCA3FA10D755FD6">
<heading id="D25E3D910D667CE76AAFE063CA544FBC" reason="title">Etymology.</heading>
</paragraph>
<paragraph id="C9F30736B7503B85585EA658A2A5C869">
This genus is named
<taxonomicName id="B74996D9906949F1C23A3AB5FC323E11" authorityName="Miller &amp; Michat &amp; Ferreira Jr" authorityYear="2024" class="Insecta" family="Dytiscidae" genus="Nilssondytes" kingdom="Animalia" order="Coleoptera" phylum="Arthropoda" rank="genus">
<emphasis id="D60D90D712B8257F8E55856D4B065CD3" italics="true">Nilssondytes</emphasis>
</taxonomicName>
from the Greek
<emphasis id="86B8C286D224FB345913F5356D4B0E4F" italics="true">dytes</emphasis>
meaning “ diver, ” and
<emphasis id="76BC7BB2368C556B57ADAD4B22FAAB46" italics="true">Nilsson</emphasis>
, after the great diving-beetle worker and excellent friend, Anders N. Nilsson, in honor of his inestimable contribution to the science of diving-beetle biology.
</paragraph>
</subSubSection>
<subSubSection id="SECID0EENAC" type="Phylogenetic relationships">
<paragraph id="94743BFD6248A1DBD19DDAA48BD416D5">
<heading id="749D3A06925F8D8FC72A7C7C984E37DA" reason="title">Phylogenetic relationships.</heading>
</paragraph>
<paragraph id="3AF769CB4DBE8A6CF7F3A9B6D91DDEC5">
The single species of
<taxonomicName id="043328742CD92478A28C63825847B85A" authorityName="Miller &amp; Michat &amp; Ferreira Jr" authorityYear="2024" class="Insecta" family="Dytiscidae" genus="Nilssondytes" kingdom="Animalia" order="Coleoptera" phylum="Arthropoda" rank="genus" status="gen. nov.">
<emphasis id="A256F06593BED7E99FB1924E6E8FFA61" italics="true">Nilssondytes</emphasis>
</taxonomicName>
<taxonomicNameLabel id="8A4D7C2F9DF9552D3DDBE101171A3643" rank="genus">gen. nov.</taxonomicNameLabel>
is part of the clade that includes species with an oblique metatrochanteric groove, but it has an unresolved position with respect to other genera (
<bibRefCitation id="70947ADD18108C875FC5134B4FAE0FDD" DOI="10.3897/zookeys.1188.110081" author="Miller" etAl="et al." firstAuthor="Miller" journalOrPublisher="ZooKeys" pagination="125-168" refId="B7" refString="Miller KB, Michat MC, Ferreira Jr N (2024) Reclassification of Cybistrinae Sharp, 1880 in the Neotropical Region (Coleoptera, Adephaga, Dytiscidae), with description of new taxa. ZooKeys 1188: 125168. https://doi.org/10.3897/zookeys.1188.110081" title="Reclassification of Cybistrinae Sharp, 1880 in the Neotropical Region (Coleoptera, Adephaga, Dytiscidae), with description of new taxa." volume="1188" year="2024">Miller et al. 2024</bibRefCitation>
). The presence of a reduced posterior metatarsal claw in both males and females (Figs
<figureCitation id="7C9032475CE61FF173375819FBA28E86" captionStart="Figures 110" captionStartId="F1" captionText="Figures 110. Nilssondytes diversus sp. nov. 1 dorsal habitus 2, 3 metatarsal claws, posterior aspect: 2 male 3 female 4 prosternal process, ventral aspect 5 right mesothoracic leg, posterior aspect 68 male genitalia: 6 median lobe, ventral aspect 7 median lobe, right lateral aspect 8 right lateral lobe, right lateral aspect 9 female genitalia (gonocoxae, laterotergites, right gonocoxosternite and internal genitalia), ventral aspect 10 male sternite IX, ventral aspect. Scale bars: 5.0 mm (1); 1.0 mm (25, 9, 10)" figureDoi="10.3897/zookeys.1210.124121.figures1-10" httpUri="https://binary.pensoft.net/fig/1123261">2</figureCitation>
,
<figureCitation id="63EF3EFB2E7F77EA37482B41BF81D0BD" captionStart="Figures 110" captionStartId="F1" captionText="Figures 110. Nilssondytes diversus sp. nov. 1 dorsal habitus 2, 3 metatarsal claws, posterior aspect: 2 male 3 female 4 prosternal process, ventral aspect 5 right mesothoracic leg, posterior aspect 68 male genitalia: 6 median lobe, ventral aspect 7 median lobe, right lateral aspect 8 right lateral lobe, right lateral aspect 9 female genitalia (gonocoxae, laterotergites, right gonocoxosternite and internal genitalia), ventral aspect 10 male sternite IX, ventral aspect. Scale bars: 5.0 mm (1); 1.0 mm (25, 9, 10)" figureDoi="10.3897/zookeys.1210.124121.figures1-10" httpUri="https://binary.pensoft.net/fig/1123261">3</figureCitation>
) with straight medial margins of the male abdominal sternite IX (Fig.
<figureCitation id="910A17D9A8C5080FCBD2778587675A87" captionStart="Figures 110" captionStartId="F1" captionText="Figures 110. Nilssondytes diversus sp. nov. 1 dorsal habitus 2, 3 metatarsal claws, posterior aspect: 2 male 3 female 4 prosternal process, ventral aspect 5 right mesothoracic leg, posterior aspect 68 male genitalia: 6 median lobe, ventral aspect 7 median lobe, right lateral aspect 8 right lateral lobe, right lateral aspect 9 female genitalia (gonocoxae, laterotergites, right gonocoxosternite and internal genitalia), ventral aspect 10 male sternite IX, ventral aspect. Scale bars: 5.0 mm (1); 1.0 mm (25, 9, 10)" figureDoi="10.3897/zookeys.1210.124121.figures1-10" httpUri="https://binary.pensoft.net/fig/1123261">10</figureCitation>
) is a unique combination of features within
<taxonomicName id="34083B2F86C8AD065F9827A6A71F7B57" authorityName="Sharp" authorityYear="1880" class="Insecta" family="Dytiscidae" kingdom="Animalia" order="Coleoptera" phylum="Arthropoda" rank="subFamily" subFamily="Cybistrinae">Cybistrinae</taxonomicName>
. Unique among this larger clade is also the sulcate prosternum and prosternal process (Fig.
<figureCitation id="50BFAAF4AA0A02B86E7B5FEFF304FEBE" captionStart="Figures 110" captionStartId="F1" captionText="Figures 110. Nilssondytes diversus sp. nov. 1 dorsal habitus 2, 3 metatarsal claws, posterior aspect: 2 male 3 female 4 prosternal process, ventral aspect 5 right mesothoracic leg, posterior aspect 68 male genitalia: 6 median lobe, ventral aspect 7 median lobe, right lateral aspect 8 right lateral lobe, right lateral aspect 9 female genitalia (gonocoxae, laterotergites, right gonocoxosternite and internal genitalia), ventral aspect 10 male sternite IX, ventral aspect. Scale bars: 5.0 mm (1); 1.0 mm (25, 9, 10)" figureDoi="10.3897/zookeys.1210.124121.figures1-10" httpUri="https://binary.pensoft.net/fig/1123261">4</figureCitation>
) which is somewhat similar to the Australian genera
<taxonomicName id="CB0970E9A8A0546EC10AF4A34BF8FF2F" authority="Sharp, 1882" authorityName="Sharp" authorityYear="1882" class="Insecta" family="Dytiscidae" genus="Spencerhydrus" kingdom="Animalia" order="Coleoptera" phylum="Arthropoda" rank="genus">
<emphasis id="AA588C53C95BA436F3E0F14F228E4527" italics="true">Spencerhydrus</emphasis>
Sharp, 1882
</taxonomicName>
and
<taxonomicName id="EF0F4974DA693923949682F1F287A6AB" authority="Brinck, 1945" authorityName="Brinck" authorityYear="1945" class="Insecta" family="Dytiscidae" genus="Sternhydrus" kingdom="Animalia" order="Coleoptera" phylum="Arthropoda" rank="genus">
<emphasis id="78774EE94EBA32F484E628818AD5599A" italics="true">Sternhydrus</emphasis>
Brinck, 1945
</taxonomicName>
.
</paragraph>
</subSubSection>
</treatment>
</document>