158 research outputs found
Hydrachna papilligera K. Viets 1919
No full textHydrachna papilligera K. Viets, 1919 Species incerta Material examined: Holotype deutonymph SMF 941, Germany, Braunschweig, Teich bei Weddel, 8.7. 1910 Kühne. Discussion: This species was described from a single deutonymph. Later, the author himself proposed its synonymy to H. skorikowi (see K. Viets 1936). In view of the difficulties of associating nymphs to conspecific adults, it must be considered a species incerta.Published as part of Davids, Kees, Sabatino, Antonio Di, Gerecke, Reinhard, Gledhill, Terence & Smit, Harry, 2005, On the taxonomy of water mites (Acari: Hydrachnidia) described from the Palaearctic, part 1: Hydrachnidae, Limnocharidae and Eylaidae, pp. 36-64 in Zootaxa 1061 on page 48, DOI: 10.5281/zenodo.17018
Hydrachna bulgarensis K. Viets 1940
No full text<i>Hydrachna bulgarensis</i> K. Viets, 1940, nov. stat. <p> <i>Hydrachna perpera bulgarensis</i> K. Viets, 1940</p> <p>Material examined: Holotype male, SMF 5917, Bulgarien, See im Rila­Gebirge, 2200 m, Valkanov coll.</p> <p> Discussion: The author placed this taxon as a subspecies of the little known <i>H. perpera</i> which is here synonymized with <i>H. processifera</i>. <i>Hydrachna bulgarensis</i> obviously belongs to the <i>geographica</i> species group (Cx­4 with four setae, mediocaudal angles extended and narrow; gnathosoma with very long rostrum; palp slender, P­2 ventrally strongly concave, with 20 fine and short dorsal setae). Further characteristics are: P­3 proximally concave, most of the segment straight, with dorsal and ventral margins slightly converging distally, bearing five dorsal and six lateral setae; P­4 short, dorsal and ventral margins straight. In contrast to the figure of Viets (1940, Fig. 3), the genital setae are differentiated into two groups, with the setae flanking the gonopore a little longer and more densely arranged than on the remaining plate surface. In the form of the male gonopore with equally rounded anterior margin and the curved shape of the frontal sclerites, <i>H. bulgarensis</i> is most similar to <i>H. incisa</i>. Minor differences are found in the genital field not being indented anteriorly, the presence of an elevated median ridge between the acetabula­bearing areas and generally taller palp segments (L/H P­2 590/310, 1.90; P­3 570/190, 3.00; P­4 235/110, 2.14). For a better understanding of this taxon, possibly a junior synonym of <i>H. incisa</i>, a study of the variability of the latter taxon is necessary.</p>Published as part of <i>Davids, Kees, Sabatino, Antonio Di, Gerecke, Reinhard, Gledhill, Terence & Smit, Harry, 2005, On the taxonomy of water mites (Acari: Hydrachnidia) described from the Palaearctic, part 1: Hydrachnidae, Limnocharidae and Eylaidae, pp. 36-64 in Zootaxa 1061</i> on page 39, DOI: <a href="http://zenodo.org/record/170186">10.5281/zenodo.170186</a>
Comparison of the Cracow-Silesian mississippi valley-type district, southern Poland, with mississippi valley-type districts in North America
No full textEconomische evaluatie; g-groep ontwerp
No full textDocument uit de collectie Chemische ProcestechnologieDelftChemTechApplied Science
Ropes of sand, and other stories [electronic resource]/ by the author of "Woven of many threads," "A crown from the spear."
No full textSpectrographic and chemical analyses of whole-rock and insoluble-residue samples, Rolla 1 degree x 2 degrees quadrangle, Missouri; drill holes no. 14 and 15
No full textSpectrographic and chemical analyses of whole-rock and insoluble-residue samples, Rolla 1 degree x 2 degrees quadrangle, Missouri; drill hole no. 17
No full textSpectrographic and chemical analyses of whole-rock and insoluble-residue samples, Rolla 1 degrees by 2 degrees quadrangle, Missouri; drill holes No. 45 and 46
No full textSpectrographic and chemical analyses of whole-rock and insoluble-residue samples, Rolla 1 degree x 2 degrees quadrangle, Missouri; drill hole no. 12
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