Schizocarpus daberti, 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 : 5-6

1. Schizocarpus daberti sp. nov.

( Fig. 2 )

Description. MALE (holotype). Body 350 long (350–365 in ten paratypes) and 175 wide (170–175); body length/ width ratio about 2:1. Idiosoma egg-shaped, strongly concave dorsally. Hysteronotal shield 110 long and 85 wide. Anterior margin of hysteronotal shield uneven. Setae d1 situated on anterior margin of hysteronotal shield or immediately anterior to this margin, distance d1-d1 50. Setae e1 situated on posterior margin of hysteronotal shield or immediately posterior to this margin. Distance e1-e1 about 25. Setae h1 situated laterally on posterior margin of hysteronotal shield, distance h1-h1 about 2.7 times longer than e1-e1. Setae f2 situated ventro-laterally. Setae h3 situated on distinct peduncles and strongly displaced ventrally, being located between posterior ends of adanal shields, distance h3-h3 20. Opisthosomal membranes moderately developed, about 20 long. Setae ps3 situated laterally, anterior to transverse level of adanal suckers. Adanal shields elongated, 1.6 longer than wide, with distinctly sclerotized external and weakly sclerotized internal borders and non-punctate central areas. Minimal distance between these shields 25. Setae ad1 represented by alveoli and situated in posterior third of adanal shields slightly inside of longitudinal level of adanal suckers, distance between adanal suckers and setae ad1 subequal to diameter of adanal suckers. Adanal suckers situated in anterior half of adanal shields, 10–12 in diameter, with dentate corolla (type E), without external sclerotized ring around. Setae ps1 situated on distinct peduncles, which almost adjoin peduncles bearing setae h3. Adanal setae ad2 absent. Ventral anal sclerite very large, asymmetrically rhomboidlike in outline, its anterior end reaching to level of alveoli ad1. Lengths of some setae: f2 35, h1 7, h2 180, h3 2, ps2 95, ps3 70. Tarsus III 20 long and 12 wide; tarsus IV 10 long and 9 wide.

Type material. Holotype male (ZIN T-Chir-21 ) and 12 male paratypes ( ZISP AVB-2012-0203-001, #1-12 ) ex Castor fiber tuvinicus [beaver #2, sample 12], RUSSIA: Tuva, Todzhinskii District, upstream water of Azas River , 52º25’N, 96º38’E, 9 October 2011, coll. A.P. Saveljev.

Type depositions. Holotype and ten paratypes—in ZISP, 1 paratype—in UMMZ, 1 paratype—in IRSNB.

Microhabitat. Posterior legs.

Distribution. Type locality only.

Etymology. This species is dedicated to the well known Polish acarologist Dr. Jacek Dabert (Adam Mickiewicz University, Poznan, Poland).

Differential diagnosis. This species is close to S. latus ( Dubinina, 1964) from C. f. orientoeuropaeus from the Voronezh Reserve (Russia) ( Dubinina 1964). In both species, the idiosoma is egg-shaped, the corolla of adanal suckers is dentate, setae ps3 are situated laterally, and setae f2 are present. These species differ from each other by the following characters. In S. daberti sp. nov., setae ad1 are situated distinctly posterior to the adanal suckers, setae ps1 are situated off the adanal shields, setae h3 are very short (2-3 long), situated on distinct peduncles and strongly displaced ventrally, immediately adjacent to the peduncles bearing setae ps1. In S. latus , setae ad1 are situated at the same transverse level with the adanal suckers, setae ps1 are situated on the adanal shields, setae h3 are 40 long, not pedunculate and situated close to the posterior margin of the opisthosoma far posterior to the peduncles bearing setae ps1.

Remark. We have reinvestigated the lectotype of S. latus and found that it is indiscernible from S. ventricosus Fain and Lukoschus, 1985 described from the Eurasian beaver of unknown origin ( Fain & Lukoschus 1985). Since the type specimens of S. latus were not available for these authors and some crucial characteristics of this species were missed in the original description ( Dubinina 1964; see Bochkov & Dubinina 2011 for redescription), Fain and Lukoschus (1985) considered S. ventricosus and S. latus as two distinctly separated species. We consider here S. ventricosus syn. nov. as a junior synonym of S. latus .

Figures

FIGURE 2. Schizocarpus daberti sp. nov., male: A—opisthosoma in dorsal view; B—same, in ventral view.