Schizocarpus tuvinicus, 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 : 10-11

5. Schizocarpus tuvinicus sp. nov.

( Fig. 6 )

Description. MALE (holotype). Idiosoma slightly flattened dorso-ventrally. Hysterosoma outline in shape of inverted trapezium. Body 325 long and 170 wide; body length/width ratio about 1.9:1. Hysteronotal shield 80 long and 85 wide. Anterior margin of hysteronotal shield widely concave. Setae d1 situated slightly posterior to anterior margin of this shield, distance d1-d1 40. Setae e1 situated on posterior margin of hysteronotal shield, distance e1- e1 35. Setae h1 situated very close to setae e1, distances e1-e1 and h1-h1 subequal. Setae f2 absent. Distance h3-h3 35. Opisthosomal membranes weakly developed, 10 long. Setae ps3 situated laterally. Setae ps2 displaced posteriorly, located distinctly posterior to adanal suckers. Adanal shields roughly subsquare in outline, evenly punctated with strongly sclerotized borders. Minimal distance between these shields 15. Adanal suckers situated in median part of adanal shields, about 7 in diameter, with smooth corolla (type A), without external sclerotized ring. Setae ad1 represented by alveoli covered with fine membranes, adjoining each other and situated between adanal shields almost at same transverse level with adanal suckers. Membranous pocket-like structure situated immediately posterior to these alveoli. Setae ps1 pedunculate, situated at level of posterior borders of adanal shields and between them, distance ps1-ps1 15. Adanal alveoli ad2 absent. Ventral anal sclerite narrow but distinct. Lengths of some setae: h1 4, h2 120, h3 and ps2 about 60, ps1 9, ps3 40. Tarsus III 20 long, 12 wide; tarsus IV 12 long, 11 wide.

Type material. Holotype male ( ZIN T-Chir-23 ) ex Castor fiber tuvinicus [beaver #2, sample 7], 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.?Tail base ventrally.

Distribution. Type locality only.

Etymology. The species epithet derives from the subspecies name of the host and is a noun in apposition.

Differential diagnosis. This new species occupies a solitary position among species of the genus with the smooth adanal suckers without the external sclerotized ring around and lacking alveoli ad2. Among previously known species, it is most similar to S. subornatus Fain and Lukoschus, 1985 from the Eurasian beaver of unknown origin ( Fain & Lukoschus 1985). In both these species, bases of setae h1 are closely situated to seta e1 bases, setae ps2 are situated laterally, the adanal shields are evenly punctated with strongly sclerotized borders. These species differ from each other by the following characters. In S. tuvinicus sp. nov., setae e1 are situated on the hysteronotal shield, setae f2 are absent, the adanal shields are roughly subsquare in outline, setae ps1 are relatively long (9), alveoli ad1 are smaller than the adanal suckers, membranous pocket-like structure is present immediately posterior to alveoli ad1, an M-shaped sclerotized band surrounding alveoli ad1 is absent. In S. subornatus , setae e1 are situated off the hysteronotal shield, setae f2 are present, the adanal shields are irregular in outline, setae ps1 are microsetae, alveoli ad1 are larger than the adanal suckers, the membranous pocket-like structure is absent, an Mshaped sclerotized band surrounding alveoli ad1 is present.

Figures

FIGURE 6. Schizocarpus tuvinicus sp. nov., male: A—opisthosoma in dorsal view; B—same, in ventral view.