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) Author Bochkov, Andre V. Author Saveljev, Alexander P. text Zootaxa 2012 3410 1 18 journal article 10.5281/zenodo.212597 79ba1a34-0254-42b6-a546-dc5dff239408 1175-5326 212597 2. Schizocarpus lavrovi sp. nov. ( Fig. 3 ) Description. MALE ( holotype ). Body 455 long ( 440-460 in nine paratypes ) and 210 wide (210-215); body length/ width ratio about 2.1:1. Idiosoma slightly flattened dorso-ventrally. Hysterosoma subparallel sided. Hysteronotal shield 90 long and 115 wide. Anterior margin of hysteronotal shield uneven and distinctly concave in median part. Setae d1 situated close to anterior margin of hysteronotal shield, distance d1-d1 50. Setae e1 situated at posterior margin of hysteronotal shield. Distance e1-e1 about 65. Setae h1 situated laterally off posterior margin of hysteronotal shield, distance h1-h1 about 1.5 times longer than e1-e1 . Setae f2 and h3 situated ventro-laterally, distance h3-h3 110. Ventro-lateral parts of opisthosoma strongly developed, distinctly longer than mid-part of opisthosomal venter. Opisthosomal membranes moderately developed, about 20 long. Setae ps3 situated laterally, at 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 25), evenly sclerotized, irregular in shape, connected to each other with 2 distinct transverse ridges, anterior ridge located at level of seta ps3 bases, posterior ridge located at level of posterior end of opisthosoma. Setae ad1 represented by alveoli and situated in anterior third of adanal shields, close to anterior ridge. Adanal suckers situated in posterior half of adanal shields, 12-14 in diameter, with smooth corolla ( type A), without external sclerotized ring. Setae ps1 situated on distinct peduncles located on adanal shields, inside and close to alveoli ad1 . Small area around setae ps1 and ad1 not punctate. Adanal setae ad2 absent. Ventral anal sclerite indistinct. Lengths of some setae: f2 38, h1 35, h2 185, h3 100, ps2 70, ps3 65. Tarsus III 30 long and 15 wide; tarsus IV 15 long and 12 wide. FIGURE 3 . Schizocarpus lavrovi sp. nov . , male: A—opisthosoma in dorsal view; B—same, in ventral view. Type material . Holotype male (ZIN T-Chir-22 ) and 9 male paratypes ( ZISP AVB-2012-0203-022, #1-9 ) ex Castor fiber tuvinicus [beaver #2, sample 5], RUSSIA : Tuva , Todzhinskii District , upstream water of Azas River , 52º25’N , 96º38’E , 9 October 2011 , coll. A.P. Saveljev ; 4 males ( AVB- 2012-0203-023, #1-4 ), beaver #1, sample 6, same locality, 8 October 2011 , coll. A.P. Saveljev ; 2 males ( AVB- 2012-0203-024, #1, 2 ), beaver #3, sample 2, downstream water Azas River , 52º32’N , 97º15’E , 15 October 2011 , coll. A.P. Saveljev ; 1 male ( AVB- 2012-0203- 025 ), beaver #4, sample 1, same locality, 16 October 2011 , coll. A.P. Saveljev . Type depositions . Holotype and seven paratypes—in ZISP , 1 paratype—in UMMZ , 1 paratype—in IRSNB . Microhabitat . Head dorsally, posterior dorsum. Distribution . Azas River. Etymology . This species is dedicated to the well known Russian researcher of beavers, Dr. Leonid Lavrov ( 1911-1992 ). Differential diagnosis . This new species is very close to S. brevicauda ( Dubinina, 1964 ) from C. f. orientoeuropaeus from Voronezh Reservation (Russia) ( Dubinina 1964 ). In both these species, the ventro-lateral parts of the opisthosoma are well developed, distinctly longer than the central part of the opisthosomal venter, the adanal shields are widely separated, setae ad1 and pedunculate setae ps1 are situated distinctly anterior to the adanal suckers, and setae ps2 are located at the level of posterior margin of the opisthosoma. These species differ from each other by the following characters. In S. lavrovi sp. nov . , setae ps1 are situated inside and close to alveoli ad1 . In S. brevicauda , setae ps1 are situated outside alveoli ad1 and much closer to setae ps3 than to ad1 .