Stenus (Nestus) immodicus Ryvkin, 2000

Ryvkin, Alexandr B., 2014, Stenus (Nestus) Pluvius Sp. N., With Notes On Some Related Species (Coleoptera: Staphylinidae: Steninae), Acta Biologica Universitatis Daugavpiliensis 14 (2), pp. 187-205 : 198-199

publication ID	https://doi.org/ 10.5281/zenodo.12646394
persistent identifier	https://treatment.plazi.org/id/03B987AC-FFC0-7818-1F1E-FCAAFDE4FC6A
treatment provided by	Felipe
scientific name	Stenus (Nestus) immodicus Ryvkin, 2000
status

Treatment

Stenus (Nestus) immodicus Ryvkin, 2000 View in CoL

(Fig. 6)

immodicus Ryvkin, 2000: 348 View in CoL

ryvkini Puthz, 2001: 58 , syn. nov.

Material examined. RUSSIA: KHABAROVSK TERRITORY: 1 male-HT ( ZMMU): USSR, Khabarovsk Province, Bolshe-Khekhtsyrskiy Reserve. 6–10.VI.1990. 400-450 m, Abies / Pinus / Betula forest. S.Golovatch & W.Schawaller leg.— 4 males, 6 females ( AR), 1 male, 1 female ( MHNG): Bol’shekhekhtsyrskiy Nature Reserve , Sosninskiy cordon. 25.05.2004. A.V.Tanasevitch leg.— 1 female ( AR): same locality & collector, Abies forest. 27.05.2004.— 1 female ( AR): Slavyanka, 20 km N Troitskoye, right Amur bank, Quercus / Betula forest. 14- 19.06.1990. S.I.Golovatch & W.Schawaller leg. — MARITIME PROVINCE: 1 female ( AR): Kavalerovskiy District, Priiskovaya Pad’ . 31.07.1977. L.D.Filatova leg.— 1 female [ HT of S. ryvkini Puthz ] ( SDEI): Primorskiy Kray [= Maritime Province]: 5 km SE Samarka, 70 km N Chuguyevka. Gordeyevskaya Mtn. 44º46’N, 134º13’E, 300 m, 29.V.1993, L.Zerche GoogleMaps .

Remarks. The original description of S. immodicus is based on the only male holotype which has been collected SW of Khabarovsk. The species is closely related to the cautus group members which have subcylindrical abdomen and fairly narrow paratergites 4 to 7 ( S. lohsei Puthz, 1965 , S. incautus Ryvkin, 2000 , S. semiputatus Ryvkin, 1995 ). Puthz (2001), when describing S. ryvkini from the only female, placed it in the crassus group and ignored presense of small but developed paratergites in this species. A comparison of both holotypes shows that those are conspecific in the external characters; the female characters of topotypical specimens of S. immodicus are quite identical to those of the holotype of S. ryvkini ; therefore S. ryvkini is to be placed in the synonymy of S. immodicus . Basing on the cited material, we can suppose that S. immodicus is widely distributed in both the Khabarovsk Territory and the Maritime Province.

Since the holotype of S. immodicus had the aedeagus with evaginated endophallus, the new topotypical material enables me to provide a new illustration for this structure (Fig. 6).