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<mods:title id="A36091FA0B3B0357C27936D021464D50">Identification guide to some Diaptomid species (Crustacea, Copepoda, Calanoida, Diaptomidae) of &quot; de la Plata &quot; River Basin (South America)</mods:title>
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<mods:namePart id="E5254C6867F16DDC4739211889223ABD">Perbiche-Neves, Gilmar</mods:namePart>
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<mods:namePart id="E360E1D0926F29EDF3F3E226AF068244">Boxshall, Geoffrey Allan</mods:namePart>
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<mods:namePart id="E944D8255F738DDA836D7FF594F339B3">Previattelli, Daniel</mods:namePart>
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<mods:namePart id="F7B92B6ABA8C76D4862B8393C9957487">Nogueira, Marcos Gomes</mods:namePart>
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<mods:namePart id="330EEE7E98141FC1B93E9C8C386D6E6E">da Rocha, Carlos Eduardo Falavigna</mods:namePart>
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<treatment id="F302525991B0655A875CE0E378A123C2" ID-GBIF-Taxon="152059644" LSID="urn:lsid:plazi:treatment:F302525991B0655A875CE0E378A123C2" httpUri="http://treatment.plazi.org/id/F302525991B0655A875CE0E378A123C2" lastPageId="62" lastPageNumber="62" pageId="59" pageNumber="60">
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<paragraph id="94A01A7E45FB5D6ADDFF60AE8F6C5AD8" pageId="59" pageNumber="60">Taxon classification Animalia Calanoida Diaptomidae</paragraph>
</subSubSection>
<subSubSection id="425FC16F01D4E081F6C0C31B6578D8E7" pageId="59" pageNumber="60" type="nomenclature">
<paragraph id="856EA56C38E7D19E1A4B999FB17E841B" pageId="59" pageNumber="60">
<taxonomicName id="F4E0376DB86359A8902AEE71E21A19D1" ID-CoL="48PX7" authority="Brehm, 1933" authorityName="Brehm" authorityYear="1933" class="Copepoda" family="Diaptomidae" genus="Odontodiaptomus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Odontodiaptomus thomseni" order="Calanoida" pageId="59" pageNumber="60" phylum="Arthropoda" rank="species" species="thomseni">Odontodiaptomus thomseni (Brehm, 1933)</taxonomicName>
Figs 79, 80, 81, 82, 83
</paragraph>
</subSubSection>
<subSubSection id="C49BB97649C64E39AE0AEEDF6E798A13" pageId="59" pageNumber="60" type="reference_group">
<paragraph id="C5F4698FED8B4CB9D045D05CCF280A9B" pageId="59" pageNumber="60">
<taxonomicName id="05F10632F1C4430A1111ACE3EA35014F" class="Copepoda" family="Diaptomidae" genus="Diaptomus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Diaptomus thomseni" order="Calanoida" pageId="59" pageNumber="60" phylum="Arthropoda" rank="species" species="thomseni">Diaptomus thomseni</taxonomicName>
Brehm, 1933
</paragraph>
</subSubSection>
<subSubSection id="34C1292A15E40F3308E9764AD4475037" pageId="59" pageNumber="60" type="diagnosis">
<paragraph id="4BD13A60F26279F3037E14B2FCBF23F3" pageId="59" pageNumber="60">Diagnosis.</paragraph>
<paragraph id="D5A699687219CF43B74190226F5C449F" pageId="59" pageNumber="60">
Adult male, body length 1088
<normalizedToken id="33B939F50BE6FB93440BD673F0330AD2" originalValue="µm">µm</normalizedToken>
. Small chitinous knob present distally on internal margin of left CR, other small chitinous processes present on right CR (Fig. 80B, E). Modified setae on segments 10, 11 and 13 of A1R large (Figs 79C, 80A); segment 14 lacking spinous process; spinous processes on segments 15 and 16 well developed; segment 20 of A1R bearing dentate hyaline membrane (Fig. 79B). Right CxP5 with small chitinous knob on surface in middle of segment (Fig. 79A). Right BspP5 bearing three rounded chitinous projections on internal margin. Right EnpP5 2-segmented (Figs 79A, 80D). Right Exp1P5 with semi-circular chitinous knob on distal margin, visible in anterior view; right Exp2P5 with lateral spine inserted proximally (Figs 79A, 80C), about 6 to 7 times longer than wide. Terminal claw of right Exp2P5 about 2.3 times longer than lateral spine. CxP5L with distal outer projection bearing sensilla about 3 times longer than wide (Fig. 79A); well-developed outer seta present on BspP5L.
</paragraph>
<caption id="B61DB529903434861C620B303695EAC7" pageId="59" pageNumber="60">
<paragraph id="9CF0ECA98EF0DC1A4EF91519F1EF31EE" pageId="59" pageNumber="60">
Figure 79.
<taxonomicName id="FE56CBF4B7F23D76BD5D33EE2DABE899" class="Copepoda" family="Diaptomidae" genus="Odontodiaptomus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Odontodiaptomus thomseni" order="Calanoida" pageId="59" pageNumber="60" phylum="Arthropoda" rank="species" species="thomseni">Odontodiaptomus thomseni</taxonomicName>
male. A P5 in frontal view B Segment 20 of A1R C Segments 10-16 of A1R.
</paragraph>
</caption>
<caption id="D03BEDBFADB00C107F9CC79AFADBDCB1" pageId="59" pageNumber="60">
<paragraph id="31138DE8493DA9B32F5A616903C7140B" pageId="59" pageNumber="60">
Figure 80.
<taxonomicName id="8BFFAFE94EAABE8512EE379A1A1ED80A" class="Copepoda" family="Diaptomidae" genus="Odontodiaptomus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Odontodiaptomus thomseni" order="Calanoida" pageId="59" pageNumber="60" phylum="Arthropoda" rank="species" species="thomseni">Odontodiaptomus thomseni</taxonomicName>
male, SEM photographs. A Dorsal view of segments 11-16 of A1R (500
<normalizedToken id="66D544816D04F710FAF90A48F66B0BBE" originalValue="µm">µm</normalizedToken>
) B Detail of small chitinous knob on internal margin of left CR (20
<normalizedToken id="EA5F9EC929653E0E7B4AFA1D27B321C0" originalValue="µm">µm</normalizedToken>
) C P3, P4 and right P5 (caudal view), showing detail of EnpP5, lateral spine of P5 (200
<normalizedToken id="3F55EF2DBF0E2714F310E3F9F70ABF75" originalValue="µm">µm</normalizedToken>
) and were the semi-circular knob in inserted in Exp2P5 in frontal view D Right EnpP5 (2
<normalizedToken id="62BBEC6CE35E36B2696CE7209A6C3BD1" originalValue="µm">µm</normalizedToken>
) E Detail of chitinous knob on internal margin of CR (2
<normalizedToken id="BF2E0CB08345B9B691D91B6BA97DAD07" originalValue="µm">µm</normalizedToken>
) F Detail of terminal claw (20
<normalizedToken id="D3B5EA80688B1A1CC233B9068B9F22E5" originalValue="µm">µm</normalizedToken>
).
</paragraph>
</caption>
<paragraph id="92D725607C781E45DCFDEA059F7428F5" pageId="59" pageNumber="60">
Adult female, body length 1245
<normalizedToken id="663DFE79F201820AB6F2DB75E3875DB9" originalValue="µm">µm</normalizedToken>
. Incomplete suture present between Ped4 and Ped5; surface of Ped4 and Ped5 smooth, lacking rows of spinules dorsally along posterior margin (Fig. 81A); lateral wings slightly asymmetrical, similar in size; left sensilla directed posteriorly, right sensilla perpendicular to body axis (Fig. 82A). GS asymmetrical, about 1.6 times longer than wide; anterior part slightly dilated, with swelling on right side anterior to that on left; right side margin with large rounded process at posterior end (Fig. 81A). Ur2 with small chitinous process on outer margin on left side (Fig. 82B). P5 symmetrical (Fig. 81B) with small conical process at outer distal corner of CxP5, bearing short robust sensilla; BspP5 with short outer seta, about as long as EnpP5. EnpP5 one-segmented. ExpP5 3-segmented; lateral spine of Exp2P5 exceeding external margin of Exp3P5; external seta of Exp3P5 nearly 2/3 length of internal seta; internal seta robust, only about 1/5 length of terminal claw (Fig. 82C, D).
</paragraph>
<caption id="F8305EB58593B0948561FEADB90FF9CD" pageId="59" pageNumber="60">
<paragraph id="848203149B3A4D6377A09E7D59D83A74" pageId="59" pageNumber="60">
Figure 81.
<taxonomicName id="96CC99733814FB4DE9354674B9F7BECB" class="Copepoda" family="Diaptomidae" genus="Odontodiaptomus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Odontodiaptomus thomseni" order="Calanoida" pageId="59" pageNumber="60" phylum="Arthropoda" rank="species" species="thomseni">Odontodiaptomus thomseni</taxonomicName>
female. A Posterior pedigers and GS B P5.
</paragraph>
</caption>
<caption id="845A86DE85B6AB8177DBFB5C0B6F5597" pageId="59" pageNumber="60">
<paragraph id="D10A53349D415D38B442C5B235ECB36F" pageId="59" pageNumber="60">
Figure 82.
<taxonomicName id="DE3547B75E286BC87F3AC20848603AE7" class="Copepoda" family="Diaptomidae" genus="Odontodiaptomus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Odontodiaptomus thomseni" order="Calanoida" pageId="59" pageNumber="60" phylum="Arthropoda" rank="species" species="thomseni">Odontodiaptomus thomseni</taxonomicName>
female, SEM photographs. A Ventral view of posterior pedigers, GS, urosome and base of CR (100
<normalizedToken id="96D08AE883AB79E01A995CF53D3D4ECB" originalValue="µm">µm</normalizedToken>
) B Detail of chitinous knobs on left external margin of last somite of urosome (10
<normalizedToken id="687DD63493DD6E5F0556872D8395EF6F" originalValue="µm">µm</normalizedToken>
) C P5 (100
<normalizedToken id="94F511167A514BE2E9DB963B02173BA8" originalValue="µm">µm</normalizedToken>
) D Exp3P5 and terminal claw (25
<normalizedToken id="BFD885AC66259BB0A4664B04F8645D62" originalValue="µm">µm</normalizedToken>
).
</paragraph>
</caption>
</subSubSection>
<subSubSection id="96D05F4FB5B445FBD08C04ED132D1A38" lastPageId="62" lastPageNumber="63" pageId="59" pageNumber="60" type="remarks">
<paragraph id="E0BC3CEC6D5E6EA23484E6CBE581F404" pageId="59" pageNumber="60">Remarks.</paragraph>
<paragraph id="9E923D5BCB96DAA1709A319EFCC9629D" lastPageId="61" lastPageNumber="62" pageId="59" pageNumber="60">
The specimens were collected in the low stretch of the Uruguay River at Salto Grande Reservoir (Fig. 83, SGRA-D). Only three individuals were found and
<pageBreakToken id="56CEE32CBC45173E510CBFFE14E7C265" pageId="60" pageNumber="61" start="start">a</pageBreakToken>
full re-description was published by
<bibRefCitation id="14DD76B575759B19BA846FBA04470F02" author="Perbiche-Neves, G" journalOrPublisher="Zoologia" pageId="79" pageNumber="80" pagination="172 - 179" title="Rediscovered after 77 years: Odontodiaptomusthomseni - a rare species of calanoid (Crustacea: Copepoda) from South America." url="10.1590/S1984-46702012000200010" volume="29" year="2012">Perbiche-Neves et al. (2012)</bibRefCitation>
. This species is on the red list of endangered species (
<normalizedToken id="5EBEEC601FD9D055A10009EE04025538" originalValue="IUCNRed">IUCN-Red</normalizedToken>
List of Threatened Species, 2010-
<bibRefCitation id="D6A3F2CF1A86CC25095577E872745D47" author="Reid, JW" journalOrPublisher="Journal of Crustacean Biology" pageId="79" pageNumber="80" title="IUCN 2010. IUCN Red List of Threatened Species. Version 2010. 4" url="http://www.iucnredlist.org" year="1996">Reid 1996</bibRefCitation>
), due to lack of recent records. The only previous confirmed record of this species was its original description (
<bibRefCitation id="9AAAE370D759C0BEF3E897449117DEAD" author="Brehm, VV" journalOrPublisher="Zoologischer Anzeiger" pageId="77" pageNumber="78" pagination="221 - 224" title="Diaptomusthomseni nov. spec., ein merkwuerdiger neuer Diaptomus aus Uruguay." volume="104" year="1933">Brehm 1933</bibRefCitation>
). There is a subsequent record of this species from pools in Venezuela, but it is doubtful and requires confirmation (
<bibRefCitation id="A40D5312586BA8CE255FD7E15C71FB66" author="Perbiche-Neves, G" journalOrPublisher="Zoologia" pageId="79" pageNumber="80" pagination="172 - 179" title="Rediscovered after 77 years: Odontodiaptomusthomseni - a rare species of calanoid (Crustacea: Copepoda) from South America." url="10.1590/S1984-46702012000200010" volume="29" year="2012">Perbiche-Neves et al. 2012</bibRefCitation>
).
<bibRefCitation id="C91623EFC4E80C010569E52F28454FFE" author="Ringuelet, RA" journalOrPublisher="Physis, Buenos Aires" pageId="80" pageNumber="81" pagination="14 - 31" title="Primeros datos ecologicos sobre copepodos dulciacuicolas de la Republica Argentina." volume="21" year="1958">Ringuelet (1958)</bibRefCitation>
did not find this species in his work on Argentinian co
<pageBreakToken id="E18A72119FAD4A1E6251315A7E399B96" pageId="61" pageNumber="62" start="start">pepods</pageBreakToken>
, nor did
<bibRefCitation id="A9B1DB3B34470A5DF23566F392A6EBAA" author="Paggi, JC" journalOrPublisher="Acta Limnologica Brasiliensia" pageId="79" pageNumber="80" pagination="685 - 719" title="Zooplankton de ambientes loticos e lenticas do rio Parana medio." volume="3" year="1990">
Paggi and
<normalizedToken id="31BEC762A54AFCB24F651F8667020702" originalValue="José">Jose</normalizedToken>
de Paggi (1990)
</bibRefCitation>
. This was only the second confirmed record of this rare species in 77 years.
</paragraph>
<caption id="AF0DC99B74DB86E5E081E3F7D4E29279" pageId="61" pageNumber="62">
<paragraph id="1BC61E5F6E0CE153DC8D3B265FFAB4F2" pageId="61" pageNumber="62">
Figure 83. Geographical distribution of
<taxonomicName id="75C9D90FB5CAED575E7EF8AB50E57D3F" class="Copepoda" family="Diaptomidae" genus="Odontodiaptomus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Odontodiaptomus thomseni" order="Calanoida" pageId="61" pageNumber="62" phylum="Arthropoda" rank="species" species="thomseni">Odontodiaptomus thomseni</taxonomicName>
in de la Plata river basin.
</paragraph>
</caption>
<paragraph id="38E0E58349BB0C19C48D0178E33AE67A" lastPageId="62" lastPageNumber="63" pageId="61" pageNumber="62">
The genus
<taxonomicName id="03B0470B920158DB6882F03750DF8135" class="Copepoda" family="Diaptomidae" genus="Odontodiaptomus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Odontodiaptomus" order="Calanoida" pageId="62" pageNumber="63" phylum="Arthropoda" rank="genus">
<pageBreakToken id="2B96EEC36EF83E90D223CD5DBBBF4DFE" pageId="62" pageNumber="63" start="start">Odontodiaptomus</pageBreakToken>
</taxonomicName>
comprises three species (equivalent to the
<taxonomicName id="29409C2EACEC750C9C97853F161C5545" genus="Diaptomoidea" lsidName="Diaptomoidea thomseni" pageId="62" pageNumber="63" rank="species" species="thomseni">thomseni</taxonomicName>
group of
<bibRefCitation id="18BCF508806378F96020980414F6DA99" author="Wright, S" journalOrPublisher="Anais da Academia Brasileira de Ciencias" pageId="81" pageNumber="82" pagination="79 - 85" title="Preliminary reports on six new species of Diaptomus from Brazil." volume="8" year="1936">Wright 1936</bibRefCitation>
), and there is a great interest in the genus because of its apparent isolation from other Neotropical
<taxonomicName id="927CCF0CC91250FF5BFC3457B77001F0" family="Diaptomidae" lsidName="" pageId="62" pageNumber="63" rank="family">Diaptomidae</taxonomicName>
(
<bibRefCitation id="7102FD208DA22792F2385D0529784A8C" author="Santos-Silva, EN" journalOrPublisher="Biologia Geral e Experimental" pageId="80" pageNumber="81" pagination="3 - 67" title="Calanoid Copepods of the families Diaptomidae, Pseudodiaptomidae, and Centropagidae from Brasil." volume="8" year="2008">Santos-Silva 2008</bibRefCitation>
). A second species of this genus,
<taxonomicName id="F23BED7138B9D29BDA1C84CC8ED6E0FB" class="Copepoda" family="Diaptomidae" genus="Odontodiaptomus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Odontodiaptomus paulistanus" order="Calanoida" pageId="62" pageNumber="63" phylum="Arthropoda" rank="species" species="paulistanus">Odontodiaptomus paulistanus</taxonomicName>
(Wright, 1936) is relatively common in Brazil, but was not found in the present study. The third species,
<taxonomicName id="90214D90EB6AC1485C91745575C6424C" class="Copepoda" family="Diaptomidae" genus="Odontodiaptomus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Odontodiaptomus michaelseni" order="Calanoida" pageId="62" pageNumber="63" phylum="Arthropoda" rank="species" species="michaelseni">Odontodiaptomus michaelseni</taxonomicName>
(
<normalizedToken id="D8D2E5979E06EE842944B52565C884F1" originalValue="Mrázek">Mrazek</normalizedToken>
, 1901), was not found in our study.
</paragraph>
</subSubSection>
</treatment>
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