treatments-xml/data/03/F7/DE/03F7DE69B040FFE6FEF6FA87FBBD8473.xml

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<mods:title id="2BEC1E6F7EE65041C541AFC67FF60FD4">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="6C0022166B19B84BAAC41C3881090BAD">Davids, Kees</mods:namePart>
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<treatment id="03F7DE69B040FFE6FEF6FA87FBBD8473" ID-DOI="http://doi.org/10.5281/zenodo.6267640" ID-GBIF-Taxon="119337863" ID-Zenodo-Dep="6267640" LSID="urn:lsid:plazi:treatment:03F7DE69B040FFE6FEF6FA87FBBD8473" httpUri="http://treatment.plazi.org/id/03F7DE69B040FFE6FEF6FA87FBBD8473" lastPageId="12" lastPageNumber="47" pageId="11" pageNumber="46">
<subSubSection id="C3443CF4B040FFE1FEF6FA87FD348533" box="[264,747,1324,1350]" pageId="11" pageNumber="46" type="nomenclature">
<paragraph id="8BE16F7FB040FFE1FEF6FA87FD348533" blockId="11.[264,747,1324,1350]" box="[264,747,1324,1350]" pageId="11" pageNumber="46">
<heading id="D0A9D813B040FFE1FEF6FA87FD348533" bold="true" box="[264,747,1324,1350]" fontSize="11" level="1" pageId="11" pageNumber="46" reason="1">
<taxonomicName id="4C5E14FCB040FFE1FEF6FA87FD348533" authority="Wainstein, 1976" authorityName="Wainstein" authorityYear="1976" box="[264,747,1324,1350]" class="Arachnida" family="Hydrachnidae" genus="Hydrachna" kingdom="Animalia" order="Trombidiformes" pageId="11" pageNumber="46" phylum="Arthropoda" rank="species" species="incognita">
<emphasis id="B92AB36DB040FFE1FEF6FA87FD348533" bold="true" box="[264,747,1324,1350]" pageId="11" pageNumber="46">
<emphasis id="B92AB36DB040FFE1FEF6FA87FDD68533" bold="true" box="[264,521,1324,1350]" italics="true" pageId="11" pageNumber="46">Hydrachna incognita</emphasis>
(
<bibRefCitation id="EFCF128EB040FFE1FDE6FA87FD3D8533" author="Wainstein" box="[536,738,1324,1350]" pageId="11" pageNumber="64" refString="Wainstein B. A. (1976) [The larvae and system of water mites of the family Hydrachnidae Leach, 1815 (Acariformes).] Institut Biologiji Vnutrennich Vod, Trudy, 31, 133 - 155. (in Russian)." type="journal article" year="1976">Wainstein, 1976</bibRefCitation>
)
</emphasis>
</taxonomicName>
</heading>
</paragraph>
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<paragraph id="8BE16F7FB040FFE1FEF6FADAFCB9865E" blockId="11.[264,1325,1393,1899]" pageId="11" pageNumber="46">
Material examined: 
<taxonomicName id="4C5E14FCB040FFE1FE07FADAFD2985FF" box="[505,758,1393,1418]" class="Arachnida" family="Hydrachnidae" genus="Hydrachna" kingdom="Animalia" order="Trombidiformes" pageId="11" pageNumber="46" phylum="Arthropoda" rank="species" species="incognita">
<emphasis id="B92AB36DB040FFE1FE07FADAFD2985FF" box="[505,758,1393,1418]" italics="true" pageId="11" pageNumber="46">Hydrachna incognita</emphasis>
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two males, three females, 
<date id="FFE049BFB040FFE1FBC2FADAFB6085FE" box="[1084,1215,1393,1419]" pageId="11" pageNumber="46" value="1993-04-30">30.04.1993</date>
<collectingCountry id="F3492FEFB040FFE1FB34FADAFAF985FE" box="[1226,1318,1393,1419]" name="Belarus" pageId="11" pageNumber="46">Belarus</collectingCountry>
, Maèulišèy, on the south of Minsk, intermittent water body, leg. M. Moroz, det. M.Cichocka; one female, 
<collectingCountry id="F3492FEFB040FFE1FDC1FA6AFD4F85AE" box="[575,656,1473,1499]" name="Russia" pageId="11" pageNumber="46">Russia</collectingCountry>
, Samara, Stavropol, National Park Samara Luka, sedgy bog near village Koltsovo, 
<date id="FFE049BFB040FFE1FDB6FA42FD138676" box="[584,716,1513,1539]" pageId="11" pageNumber="46" value="1999-05-30">30.05.1999</date>
coll. Tuzovskij. For comparison: 
<taxonomicName id="4C5E14FCB040FFE1FBA7FA42FAF58677" box="[1113,1322,1513,1538]" class="Arachnida" family="Hydrachnidae" genus="Hydrachna" kingdom="Animalia" order="Trombidiformes" pageId="11" pageNumber="46" phylum="Arthropoda" rank="species" species="leegei">
<emphasis id="B92AB36DB040FFE1FBA7FA42FAF58677" box="[1113,1322,1513,1538]" italics="true" pageId="11" pageNumber="46">Hydrachna leegei</emphasis>
</taxonomicName>
one male, one female, 
<collectingCountry id="F3492FEFB040FFE1FDECF9BAFDAD865E" box="[530,626,1553,1579]" name="Sweden" pageId="11" pageNumber="46">Sweden</collectingCountry>
, 
<collectionCode id="ED4FF7BAB040FFE1FD80F9BAFD0C865E" box="[638,723,1553,1579]" httpUri="http://grbio.org/cool/8z6v-f8is" name="Saskatchewan Museum of Natural History" pageId="11" pageNumber="46">SMNH</collectionCode>
5330, 5332.
</paragraph>
<paragraph id="8BE16F7FB040FFE6FEC6F992FB9482EB" blockId="11.[264,1325,1393,1899]" lastBlockId="12.[264,1324,284,1030]" lastPageId="12" lastPageNumber="47" pageId="11" pageNumber="46">
Discussion: This species was mostly defined from the morphology of larvae. Only a few female idiosoma measurements are published and the male has not yet been described. Following the original description, important characters regard the sclerite dots in the frontal area (separate, not fused to longish platelets); genital field L 350, deeply indented anteriorly, maximum W 470, acetabula extend posteriorly to the level of the tip of the indentation, in the posterior part groups of hairs; gnathosomal rostrum L 430; palp similar to 
<taxonomicName id="4C5E14FCB040FFE1FED9F882FE4D8737" box="[295,402,1833,1858]" class="Arachnida" family="Hydrachnidae" genus="Hydrachna" kingdom="Animalia" order="Trombidiformes" pageId="11" pageNumber="46" phylum="Arthropoda" rank="species" species="leegei">
<emphasis id="B92AB36DB040FFE1FED9F882FE4D8737" box="[295,402,1833,1858]" italics="true" pageId="11" pageNumber="46">H. leegei</emphasis>
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, L measurements: P­1 165, P­2 205, P­3 245, P­4 (obviously not considering the dorsodistal extension) 75, P­5 50. Our study of a male and a female from 
<collectingCountry id="F3492FEFB040FFE1FB69F8FAFB2E871E" box="[1175,1265,1873,1899]" name="Belarus" pageId="11" pageNumber="46">Belarus</collectingCountry>
give the following additional information. Male: Sclerites near postocularia L 160, coxal field L 700, Cx­4 bearing one seta; genital field L/W 420/480, gnathosomal base L 300, rostrum L 310; chelicera L 960; palp total L 600, setae: P­1 two dorsodistal, P­3 five to seven dorsal and two to three lateral, P­3 two dorsal and three to four lateral; measurements (L/ H) P­1 150/180 (0.8), P­2 145/95 (1.5), P­3 185/70 (2.6), P­4 85/40 (2.1), P­ 
<date id="FFE049BFB047FFE6FB75FE17FB3C81A3" box="[1163,1251,444,470]" pageId="12" pageNumber="47" value="1935-05-20">5 35/20</date>
(1.8). Female: Sclerites near postocularia L 110–180, coxal field L 640–950, Cx­4 bearing one seta; genital field L/W 310–380/430–515, gnathosoma base L 380–450, rostrum L 410–470; chelicera L 1150–1360; palp total L 760–860, setation as in male; measurements (L/H) P­1 170–200/200–250 (0.8–0.9), P­2 200–220/120–145 (1.5–1.7), P­3 230–280/ 80–95 (2.9–3.0), P­4 110–115/50–53 (2.2), P­5 45–50/25–27 (1.7–2.0).
</paragraph>
<paragraph id="8BE16F7FB047FFE6FEC6FD07FBBD8473" blockId="12.[264,1324,284,1030]" pageId="12" pageNumber="47">
Discussion: 
<emphasis id="B92AB36DB047FFE6FE30FD07FC8B82B0" box="[462,852,684,709]" italics="true" pageId="12" pageNumber="47">
<taxonomicName id="4C5E14FCB047FFE6FE30FD07FD0E82B0" box="[462,721,684,709]" class="Arachnida" family="Hydrachnidae" genus="Hydrachna" kingdom="Animalia" order="Trombidiformes" pageId="12" pageNumber="47" phylum="Arthropoda" rank="species" species="incognita">Hydrachna incognita</taxonomicName>
, 
<taxonomicName id="4C5E14FCB047FFE6FD1DFD07FC8B82B0" box="[739,852,684,709]" class="Arachnida" family="Hydrachnidae" genus="Hydrachna" kingdom="Animalia" order="Trombidiformes" pageId="12" pageNumber="47" phylum="Arthropoda" rank="species" species="leegei">H. leegei</taxonomicName>
</emphasis>
and a further species described from 
<collectingCountry id="F3492FEFB047FFE6FEF6FD7FFE86829B" box="[264,345,724,750]" name="Russia" pageId="12" pageNumber="47">Russia</collectingCountry>
, 
<taxonomicName id="4C5E14FCB047FFE6FE96FD7FFD77829B" authority="Wainstein, 1976" authorityName="Wainstein" authorityYear="1976" box="[360,680,724,750]" class="Arachnida" family="Hydrachnidae" genus="Hydrachna" kingdom="Animalia" order="Trombidiformes" pageId="12" pageNumber="47" phylum="Arthropoda" rank="species" species="vulpes">
<emphasis id="B92AB36DB047FFE6FE96FD7FFE058298" box="[360,474,724,749]" italics="true" pageId="12" pageNumber="47">H. vulpes</emphasis>
<bibRefCitation id="EFCF128EB047FFE6FE1AFD7FFD77829B" author="Wainstein" box="[484,680,724,750]" pageId="12" pageNumber="64" refString="Wainstein B. A. (1976) [The larvae and system of water mites of the family Hydrachnidae Leach, 1815 (Acariformes).] Institut Biologiji Vnutrennich Vod, Trudy, 31, 133 - 155. (in Russian)." type="journal article" year="1976">Wainstein, 1976</bibRefCitation>
</taxonomicName>
, form a group of taxa at the adult stage grading into each other with regard to shape and arrangement of the frontal sclerites. Currently, it is difficult to find clear points of separation between these taxa. Obviously, the extent of sclerotization of the muscle attachments in the frontal area is rather variable and may be different at the right and left side of the same specimen. The results of our measurements furthermore demonstrate a large variability range of female 
<taxonomicName id="4C5E14FCB047FFE6FC23FC37FBAD83C0" box="[989,1138,924,949]" class="Arachnida" family="Hydrachnidae" genus="Hydrachna" kingdom="Animalia" order="Trombidiformes" pageId="12" pageNumber="47" phylum="Arthropoda" rank="species" species="incognita">
<emphasis id="B92AB36DB047FFE6FC23FC37FBAD83C0" box="[989,1138,924,949]" italics="true" pageId="12" pageNumber="47">H. incognita</emphasis>
</taxonomicName>
and agreement with 
<taxonomicName id="4C5E14FCB047FFE6FEB4FC6FFE6583A8" box="[330,442,964,989]" class="Arachnida" family="Hydrachnidae" genus="Hydrachna" kingdom="Animalia" order="Trombidiformes" pageId="12" pageNumber="47" phylum="Arthropoda" rank="species" species="leegei">
<emphasis id="B92AB36DB047FFE6FEB4FC6FFE6583A8" box="[330,442,964,989]" italics="true" pageId="12" pageNumber="47">H. leegei</emphasis>
</taxonomicName>
from most points of view. However, in both sexes of 
<taxonomicName id="4C5E14FCB047FFE6FB89FC6FFACF83A8" box="[1143,1296,964,989]" class="Arachnida" family="Hydrachnidae" genus="Hydrachna" kingdom="Animalia" order="Trombidiformes" pageId="12" pageNumber="47" phylum="Arthropoda" rank="species" species="incognita">
<emphasis id="B92AB36DB047FFE6FB89FC6FFACF83A8" box="[1143,1296,964,989]" italics="true" pageId="12" pageNumber="47">H. incognita</emphasis>
</taxonomicName>
a difference is found in the stouter P­3 (L/H ratio &lt;3.0, in 
<taxonomicName id="4C5E14FCB047FFE6FC5DFC47FBD28470" box="[931,1037,1004,1029]" class="Arachnida" family="Hydrachnidae" genus="Hydrachna" kingdom="Animalia" order="Trombidiformes" pageId="12" pageNumber="47" phylum="Arthropoda" rank="species" species="leegei">
<emphasis id="B92AB36DB047FFE6FC5DFC47FBD28470" box="[931,1037,1004,1029]" italics="true" pageId="12" pageNumber="47">H. leegei</emphasis>
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&gt; 3.3).
</paragraph>
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