Sperchon ( Hispidosperchon ) setiger Thor, 1898

Kolesnikov, Vasiliy B. & Stolbov, Vitaly A., 2025, Review of the genus Sperchon Kramer, 1877 (Acari, Hydrachnidia: Sperchontidae) from Russia, Zootaxa 5666 (1), pp. 53-73 : 65

Sperchon ( Hispidosperchon) setiger Thor, 1898

( Figs 8– 10 , 11E,F )

Material examined. Three females, Russia, Yaroslavl region, Kutma River , 24.11.2024, leg. V. Kolesnikov ; one female, Russia, Sverdlovsk Region, Balda River , 04.10.2020, leg. V. Stolbov (COX1 sequence: OL343041 ) .

Diagnosis. Integument reticulated, with numerous folds. Glandularia platelets of dorsum not enlarged, dorsum with small muscle attachment plates (Dc-2-4 and Dl-1-4). Cx-I+II separated, Cx-III without glandular opening, Cxgl-4 is the only seta between Cx-IV and genital plates. Venter with muscle attachment platelets. Acetabula 1 and 2 elongated, close to each other. Excretory pore without sclerotized ring, located close to Vgl-3. P-2 not shortened or widened, with a pointed distoventral projection with three distal short setae, ventral spiniform seta absent. P-3 with four spiniform ventral setae. Ventral peg-like seta on P-4 small. P-5 short. IV-L-3-5 with few, simple dorsal setae.

Figures

FIGURES 8. Sperchon (Hispidosperchon) setiger, female: A—idiosoma, dorsal view; B—idiosoma, ventral view. Scale bar 100 µm.

FIGURES 9. Sperchon (Hispidosperchon) setiger, female: A—palp; B—P-5 and distal part of P-4; C—gnathosoma; D— chelicera; E—genital plates. Scale bar 100 µm, except B—10 µm.

FIGURES 10. Sperchon (Hispidosperchon) setiger, female: A—leg I; B—leg II; C—leg III; D—leg IV. Scale bar 100 µm.

FIGURES 11. Integument dorsally (A, C, E) and ventrally (B, D, F), DIC images: A, B—Sperchon (Sperchon) zhavoronkovae sp. nov.; C, D—Sperchon (Sperchon) uralensis sp. nov.; E, F—Sperchon (Hispidosperchon) setiger.