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<mods:title id="9E38B84673CCAF1F44D7E04A69B5F3C4">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="4ACA38EFF4CC9623A9D27A9762A8E04D">Davids, Kees</mods:namePart>
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<mods:namePart id="28CAB75E6DA0EAA0974E4F2413BB620E">Sabatino, Antonio Di</mods:namePart>
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<mods:namePart id="A035786D29B83FFA6A842C55116D9C6B">Gerecke, Reinhard</mods:namePart>
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<mods:namePart id="9F4B45D59530134430F3012D8190D72F">Gledhill, Terence</mods:namePart>
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<treatment id="03F7DE69B04CFFE2FEF6FA8AFBD883FB" ID-DOI="http://doi.org/10.5281/zenodo.6267631" ID-GBIF-Taxon="119337833" ID-Zenodo-Dep="6267631" LSID="urn:lsid:plazi:treatment:03F7DE69B04CFFE2FEF6FA8AFBD883FB" httpUri="http://treatment.plazi.org/id/03F7DE69B04CFFE2FEF6FA8AFBD883FB" lastPageId="8" lastPageNumber="43" pageId="7" pageNumber="42">
<subSubSection id="C3443CF4B04CFFEDFEF6FA8AFD0D854E" box="[264,722,1313,1339]" pageId="7" pageNumber="42" type="nomenclature">
<paragraph id="8BE16F7FB04CFFEDFEF6FA8AFD0D854E" blockId="7.[264,722,1313,1339]" box="[264,722,1313,1339]" pageId="7" pageNumber="42">
<heading id="D0A9D813B04CFFEDFEF6FA8AFD0D854E" bold="true" box="[264,722,1313,1339]" fontSize="11" level="1" pageId="7" pageNumber="42" reason="1">
<taxonomicName id="4C5E14FCB04CFFEDFEF6FA8AFD0D854E" authority="Muller, 1776" authorityName="Muller" authorityYear="1776" box="[264,722,1313,1339]" class="Arachnida" family="Hydrachnidae" genus="Hydrachna" kingdom="Animalia" order="Trombidiformes" pageId="7" pageNumber="42" phylum="Arthropoda" rank="species" species="geographica">
<emphasis id="B92AB36DB04CFFEDFEF6FA8AFD0D854E" bold="true" box="[264,722,1313,1339]" pageId="7" pageNumber="42">
<emphasis id="B92AB36DB04CFFEDFEF6FA8AFDF1854E" bold="true" box="[264,558,1313,1339]" italics="true" pageId="7" pageNumber="42">Hydrachna geographica</emphasis>
Müller, 1776
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<subSubSection id="C3443CF4B04CFFE2FEF6FAC7FBD883FB" lastPageId="8" lastPageNumber="43" pageId="7" pageNumber="42" type="materials_examined">
<paragraph id="8BE16F7FB04CFFEDFEF6FAC7FC7285DB" blockId="7.[264,1323,1388,1894]" pageId="7" pageNumber="42">
Material examined: 
<collectionCode id="ED4FF7BAB04CFFEDFE0DFAC7FD9785F3" box="[499,584,1388,1414]" httpUri="http://grbio.org/cool/8z6v-f8is" name="Saskatchewan Museum of Natural History" pageId="7" pageNumber="42">SMNH</collectionCode>
6059, SV, Gästrikland, male; 
<collectionCode id="ED4FF7BAB04CFFEDFC5BFAC7FC2585F3" box="[933,1018,1388,1414]" httpUri="http://grbio.org/cool/8z6v-f8is" name="Saskatchewan Museum of Natural History" pageId="7" pageNumber="42">SMNH</collectionCode>
without number, Neuman coll., Gotland, female; 
<collectionCode id="ED4FF7BAB04CFFEDFDE8FA3FFDB485DB" box="[534,619,1428,1454]" httpUri="http://grbio.org/cool/8z6v-f8is" name="Saskatchewan Museum of Natural History" pageId="7" pageNumber="42">SMNH</collectionCode>
6060 SV Smaland, female.
</paragraph>
<paragraph id="8BE16F7FB04CFFE2FEC6FA17FD8782B3" blockId="7.[264,1323,1388,1894]" lastBlockId="8.[264,1324,284,910]" lastPageId="8" lastPageNumber="43" pageId="7" pageNumber="42">
Discussion: This species has been very often cited, recorded and also figured in the literature (for detailed accounts see 
<bibRefCitation id="EFCF128EB04CFFEDFD57FA4FFC92858B" author="Viets" box="[681,845,1508,1534]" pageId="7" pageNumber="64" refString="Viets, K. (1956) Die Milben des Sußwassers und des Meeres. Hydrachnellae et Halacaridae (Acari). II. und III. Teil: Katalog und Nomenklator. G. Fischer, Jena, 870 pp." type="book" year="1956">K. Viets 1956</bibRefCitation>
, 
<bibRefCitation id="EFCF128EB04CFFEDFCA7FA4FFBCB858B" author="Viets" box="[857,1044,1508,1534]" pageId="7" pageNumber="64" refString="Viets, K. O. (1987) Die Milben des Sußwassers (Hydrachnellae und Halacaridae [part.], Acari). II.: Katalog. Sonderbande des Naturwissenschaftlichen Vereins Hamburg, 8, 1 - 1012." type="journal article" year="1987">K.O.Viets 1987</bibRefCitation>
). However, there is still little information concerning measurements and general morphology of males ­ previous authors were content with defining the species by its large size and the particular, namegiving colour pattern of the dorsal idiosoma (e.g. 
<bibRefCitation id="EFCF128EB04CFFEDFC83F9F7FB678603" author="Soar" box="[893,1208,1628,1654]" pageId="7" pageNumber="63" refString="Soar, C. D. &amp; Williamson, W. (1925) The British Hydracarina. Vol. I. London, Ray Society, 110, 1 - 266." type="journal article" year="1925">Soar &amp; Williamson 1925</bibRefCitation>
). Further characteristics in the re­examined specimens concern the presence of rod­shaped frontal sclerites flanking the postocularia (L 
<quantity id="4CA6C29AB04CFFEDFD2FF907FCFF86B3" box="[721,800,1708,1734]" metricMagnitude="1" metricUnit="m" metricValue="1.016" pageId="7" pageNumber="42" unit="in" value="400.0">400 in</quantity>
male,&gt; 
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females) and two to three minute sclerite dots halfway between pre­ and postocularia; 6­8 setae on Cx­4; the gnathosoma with very long, weakly curved rostrum (L ratio gnathosomal rostrum/base&gt; 1.5) in dorsal view distinctly set of from the base; a slender palp (L/H P­2&gt; 1.5, P­3&gt; 3.5) with high numbers of short setae on the dorsal surface of P­2 and 5­10 longer hair setae on the medial surface of P­3, but absence of setae from P­1. Important measurements are as follows. Male: Coxal field L 2000; frontal sclerite L 400, genital field L/W 880/840; gnathosomal base 660, rostrum 1000; chelicera L 2200, palp total L 1730, segments L/H P­1 300/460 (0.65), P­2 500/280 (1.79), P­3 620/140 (4.43), P­4 220/90 (2.44), P­5 L/H 90/40 (2.25); P­2 with 18 dorsal and six lateral, P­3 with three dorsal and eight lateral setae. Females: Coxal field L 2300–2600; frontal sclerite L 560–620, genital field L/W 630–700/840–1000; gnathosomal base 800, rostrum 1600; chelicera L 2800, palp total L 2280–2410, segments L/H P­1 400–420/590–640 (0.66–0.68), P­2 670–710/370–380 (1.81–1.87, P­3 850–930/190–195 (4.47–4.77), P­4 250/110 (2.27), P­5 L/H 100–110/ 50–60 (1.67–2.20); P­2 with 13–15 dorsal and two lateral, P­3 with three to eight dorsal and four to five lateral setae.
</paragraph>
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Together with the similar 
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<emphasis id="B92AB36DB043FFE2FD7EFD7FFD2E8298" box="[640,753,724,749]" italics="true" pageId="8" pageNumber="43">H. incisa</emphasis>
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and 
<taxonomicName id="4C5E14FCB043FFE2FCC9FD7FFC368298" box="[823,1001,724,749]" class="Arachnida" family="Hydrachnidae" genus="Hydrachna" kingdom="Animalia" order="Trombidiformes" pageId="8" pageNumber="43" phylum="Arthropoda" rank="species" species="bulgarensis">
<emphasis id="B92AB36DB043FFE2FCC9FD7FFC368298" box="[823,1001,724,749]" italics="true" pageId="8" pageNumber="43">H. bulgarensis</emphasis>
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, 
<taxonomicName id="4C5E14FCB043FFE2FC01FD7FFB628298" box="[1023,1213,724,749]" class="Arachnida" family="Hydrachnidae" genus="Hydrachna" kingdom="Animalia" order="Trombidiformes" pageId="8" pageNumber="43" phylum="Arthropoda" rank="species" species="geographica">
<emphasis id="B92AB36DB043FFE2FC01FD7FFB628298" box="[1023,1213,724,749]" italics="true" pageId="8" pageNumber="43">H. geographica</emphasis>
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forms a morphologically distinct species group. All other European species are minor in dimensions, have muscle attachment sclerites associated with the preocularia, only one seta on Cx­4, a shorter gnathosomal rostrum, stouter palps, a less dense setation on P­2 (dorsally) and P­3 (medially), and often a dorsodistal seta on P­1.
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