Schizocarpus unzhakovi, Bochkov, Andre V. & Saveljev, Alexander P., 2012

Bochkov, Andre V. & Saveljev, Alexander P., 2012, Fur mites of the genus Schizocarpus Trouessart (Acari: Chirodiscidae) from the Eurasian beaver Castor fiber tuvinicus Lavrov (Rodentia: Castoridae) in the Azas River (Tuva Republic, Russia), Zootaxa 3410, pp. 1-18 : 8

3. Schizocarpus unzhakovi sp. nov. ( Fig. 4 )

Description. MALE (holotype). Body 425 long and 200 wide; body length/width ratio about 2.1:1. Idiosoma slightly flattened dorso-ventrally. Hysterosoma subparallel sided. Hysteronotal shield 100 long and 95 wide. Anterior margin of hysteronotal shield uneven and distinctly concave in median part. Setae d1 immediately anterior to anterior margin of hysteronotal shield, distance d1-d1 55. Setae e1 situated immediately posterior to posterior margin of hysteronotal shield. Distance e1-e1 about 45. Setae h1 situated laterally off posterior margin of hysteronotal shield, distance h1-h1 about 2 times longer than e1-e1. Setae f2 and h3 situated ventro-laterally, distance h3-h3 100. Ventro-lateral parts of opisthosoma strongly developed, distinctly longer than mid-part of opisthosomal venter. Opisthosomal membranes distinctly developed, about 40 long. Setae ps3 situated laterally, slightly anterior to level of setae e2 and distinctly anterior to transverse level of adanal suckers. Setae ps2 posteriorly displaced, situated at level of posterior margin of opisthosoma. Adanal shields widely separated (minimal distance between them 20), evenly sclerotized, comma-shaped in outline, connected to each other with 2 distinct transverse ridges, anterior ridge located at level of seta ps3 bases, posterior ridge at level of posterior end of opisthosoma. Setae ad1 represented by distinct alveoli, adjoining each other and situated between adanal shields slightly posterior to level of seta ps3 bases. Adanal suckers situated in posterior half of adanal shields, 12 in diameter, with smooth corolla (type A), without external sclerotized ring. Setae ps1 situated on distinct peduncles located on median part of anterior sclerotized ridge at same longitudinal level with setae ad1, distance ps1-ps1 5 long. Adanal setae ad2 absent. Ventral anal sclerite distinctly developed, pointed apically. Lengths of some setae: f2 35, h1 25, h2 150, h3 90, ps2 75, ps3 45. Tarsus III 30 long and 15 wide; tarsus IV 15 long and 12 wide.

Type material. Holotype male ( ZISP T-Chir-26 ) ex Castor fiber tuvinicus [beaver #2, sample 11], RUSSIA: Tuva, Todzhinskii District, upstream water of Azas River , 52º25’N, 96º38’E, 9 October 2011, coll. A.P. Saveljev.

Type deposition. Holotype—in ZISP.

Microhabitat.?Anterior abdomen.

Distribution. Type locality only.

Etymology. The species is named after V.V. Unzhakov, a Russian zoologist, who had been investigating the Tuvinian beaver for many years.

Differential diagnosis. This new species is very close to S. lavrovi sp. nov. described above. In both of these species, the ventro-lateral parts of the opisthosoma are well developed, distinctly longer than the mid part of the opisthosomal venter, the adanal shields are widely separated, setae ad1 and pedunculate ps1 are situated distinctly anterior to the adanal suckers, and setae ps2 are located at the level of the posterior margin of the opisthosoma. These species differ from each other by the following characters. In S. unzhakovi sp. nov., setae ad1 and ps1 are situated off the adanal shields, setae ps1 are located close to each other, setae ad1 adjoin each other and located distinctly posterior to setae ps1, the ventral anal sclerite is distinctly developed. In S. lavrovi , setae ad1 and ps1 are situated on the adanal shields very close to each other, and the ventral anal sclerite is indistinct.

Figures

FIGURE 4. Schizocarpus unzhakovi sp. nov., male: A—opisthosoma in dorsal view; B—same, in ventral view.