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<mods:title id="DA8C2B84F165E994BC9191B0B17CB17A">On the taxonomy of water mites (Acari: Hydrachnidia) described from the Palaearctic, part 1: Hydrachnidae, Limnocharidae and Eylaidae</mods:title>
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<mods:namePart id="F2880938A07C62A20BC229BE45ACCE16">Davids, Kees</mods:namePart>
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<mods:namePart id="70AF8DEE268BA2C62E22BF0B7A439DCC">Sabatino, Antonio Di</mods:namePart>
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<mods:namePart id="3EA39F809CB0A5DEE4A6F8695BF98EDC">Gerecke, Reinhard</mods:namePart>
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<mods:namePart id="674FF4A91895496B84FDCDF3E3A7D80E">Gledhill, Terence</mods:namePart>
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<mods:namePart id="6ABDA4D394DA7DAE71130404BB5459F3">Smit, Harry</mods:namePart>
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<treatment id="03F7DE69B04CFFEDFEF6FEB7FE6884B6" ID-DOI="http://doi.org/10.5281/zenodo.6267629" ID-GBIF-Taxon="119337829" ID-Zenodo-Dep="6267629" LSID="urn:lsid:plazi:treatment:03F7DE69B04CFFEDFEF6FEB7FE6884B6" httpUri="http://treatment.plazi.org/id/03F7DE69B04CFFEDFEF6FEB7FE6884B6" lastPageNumber="42" pageId="7" pageNumber="42">
<subSubSection id="C3443CF4B04CFFEDFEF6FEB7FD728140" box="[264,685,283,310]" pageId="7" pageNumber="42" type="nomenclature">
<paragraph id="8BE16F7FB04CFFEDFEF6FEB7FD728140" blockId="7.[264,685,283,310]" box="[264,685,283,310]" pageId="7" pageNumber="42">
<heading id="D0A9D813B04CFFEDFEF6FEB7FD728140" bold="true" box="[264,685,283,310]" fontSize="11" level="1" pageId="7" pageNumber="42" reason="1">
<taxonomicName id="4C5E14FCB04CFFEDFEF6FEB7FD728140" authority="Koenike, 1897" authorityName="Koenike" authorityYear="1897" box="[264,685,283,310]" class="Arachnida" family="Hydrachnidae" genus="Hydrachna" kingdom="Animalia" order="Trombidiformes" pageId="7" pageNumber="42" phylum="Arthropoda" rank="species" species="extorris">
<emphasis id="B92AB36DB04CFFEDFEF6FEB7FD728140" bold="true" box="[264,685,283,310]" pageId="7" pageNumber="42">
<emphasis id="B92AB36DB04CFFEDFEF6FEB7FE2A8143" bold="true" box="[264,501,284,310]" italics="true" pageId="7" pageNumber="42">Hydrachna extorris</emphasis>
<bibRefCitation id="EFCF128EB04CFFEDFE02FEB0FD728140" author="Koenike" box="[508,685,283,309]" pageId="7" pageNumber="63" refString="Koenike, F. (1897) Zur Systematik der Gattung Eylais LATR. (Vorlaufige Mittheilung). Abhandlungen herausgegeben vom naturwissenschaftlichen Verein Bremen, 14, 279 - 295." type="journal article" year="1897">Koenike, 1897</bibRefCitation>
</emphasis>
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</paragraph>
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<subSubSection id="C3443CF4B04CFFEDFEF6FECAFE6884B6" pageId="7" pageNumber="42" type="materials_examined">
<paragraph id="8BE16F7FB04CFFEDFEF6FECAFCDD81D6" blockId="7.[264,1323,353,1219]" pageId="7" pageNumber="42">
Material examined:
<typeStatus id="54E5D1DDB04CFFEDFE06FECAFDBA810E" box="[504,613,353,379]" pageId="7" pageNumber="42" type="holotype">Holotype</typeStatus>
female
<collectionCode id="ED4FF7BAB04CFFEDFD39FECAFCC5810E" box="[711,794,353,379]" pageId="7" pageNumber="42">NHUB</collectionCode>
953 ­ without collecting site details, neither on the slide, nor in the original description.
</paragraph>
<paragraph id="8BE16F7FB04CFFEDFEC6FE1AFE058296" blockId="7.[264,1323,353,1219]" pageId="7" pageNumber="42">Description: Frontal area in several pieces, with presence and arrangement of minute sclerites indeterminate. However, a pair of well developed crescent­shaped sclerites (L 300) associated with postocularia; coxal field L 1600; genital field L/W 550/780, with a minute indentation anteriorly and an extended furrow of porose sclerotization separating the two groups of acetabula; gnathosoma L 1500, rostrum L 1050 (rostrum/base 2.3), chelicera L 1960; palp measurements (L/H) P­1 220/430 (0.5), P­2 450/290 (1.6), P­3 540/ 138 (3.9), P­4 200/90 (2.2), P­5 75/50 (1.5), setation: P­1 0, P­2 dorsal 11, lateral 3, P­3 dorsal 3, lateral 1.</paragraph>
<paragraph id="8BE16F7FB04CFFEDFEC6FD5AFE6884B6" blockId="7.[264,1323,353,1219]" pageId="7" pageNumber="42">
Discussion: This species provides a special problem: Notwithstanding the bad state of conservation of the
<typeStatus id="54E5D1DDB04CFFEDFE10FCB2FD888346" box="[494,599,793,819]" pageId="7" pageNumber="42" type="holotype">holotype</typeStatus>
, several important characters are visible, and clear differences in comparison with all other W Palaearctic species can be found.
<taxonomicName id="4C5E14FCB04CFFEDFBDAFCEAFAD2832F" box="[1060,1293,833,858]" class="Arachnida" family="Hydrachnidae" genus="Hydrachna" kingdom="Animalia" order="Trombidiformes" pageId="7" pageNumber="42" phylum="Arthropoda" rank="species" species="extorris">
<emphasis id="B92AB36DB04CFFEDFBDAFCEAFAD2832F" box="[1060,1293,833,858]" italics="true" pageId="7" pageNumber="42">Hydrachna extorris</emphasis>
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is similar to the members of the
<taxonomicName id="4C5E14FCB04CFFEDFD86FCC2FCD383F7" box="[632,780,873,898]" class="Arachnida" family="Hydrachnidae" genus="Hydrachna" kingdom="Animalia" order="Trombidiformes" pageId="7" pageNumber="42" phylum="Arthropoda" rank="species" species="geographica">
<emphasis id="B92AB36DB04CFFEDFD86FCC2FCD383F7" box="[632,780,873,898]" italics="true" pageId="7" pageNumber="42">geographica</emphasis>
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group in the very long gnathosomal rostrum and a frontal area with rather large, crescent­shaped sclerites associated with the postocularia, but obviously without further sclerotizations. However, it differs in the presence of only one seta on Cx­4 and having a rather stout palp (L/H P­2 1.6, P­3 3.9, P­4 2.2) with lower setae numbers. In the shape of P­3 it is similar to
<taxonomicName id="4C5E14FCB04CFFEDFBFFFBA2FB6B8457" box="[1025,1204,1033,1058]" class="Arachnida" family="Hydrachnidae" genus="Hydrachna" kingdom="Animalia" order="Trombidiformes" pageId="7" pageNumber="42" phylum="Arthropoda" rank="species" species="processifera">
<emphasis id="B92AB36DB04CFFEDFBFFFBA2FB6B8457" box="[1025,1204,1033,1058]" italics="true" pageId="7" pageNumber="42">H. processifera</emphasis>
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, a species with shorter postocular sclerites and a much shorter P­2 (L 240­270). The fact that no further records have been published since the first description suggests that this species of completely unclear geographical origin does not belong to the rather intensively studied E uropean fauna.
</paragraph>
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