Acrossus Mulsant, 1842

Alekseev, Vitalii I., 2018, Scarabaeoidea (Insecta: Coleoptera) Of The Kaliningrad Region (Russia): The Commented Actual Checklist, Assessment Of Rarity And Notes To Regional Protection, Acta Biologica Universitatis Daugavpiliensis 18 (2), pp. 111-152 : 124-125

Subgenus Acrossus Mulsant, 1842

(5) A. bimaculatus (Laxman, 1770)

Bercio & Folwaczny 1979.

Kaliningrad Region: Gur. (Königsberg), Gus. (Gumbinnen).

Comments: The beetles and larvae feed on

horse dung. The species range formerly included Estonia ( Silfverberg 2010), Latvia ( Telnov 2004), Belarus (Alexandovitch & Pisanenko 1991) and southern regions of Central and Eastern Europe. The evident decline of populations and decrease of distributional range in the XX century in the northern parts of areal is recognized ( Nikitsky 2016); the species is included in the Russian Red Data Book ( Nikitsky 2001a) and is listed in the Red Data Book of the Kaliningrad Region ( Dedkov & Grishanov 2010) as the regionally extinct during last 50 years species. The beetle has the “possible extinct” status in Poland too ( Pawłowski et al. 2002). The actual presence of the species in the regional fauna needs confirmation and the field work in eastern parts of the Kaliningrad Region should definitely clarify the question.

6. A. depressus (Kugelann, 1792)

Bercio & Folwaczny 1979

Voucher specimens: 4 [Dolzhanskoe, 29 June 1997; Kolosovka, 26 April 2002; Riabinovka, 20 June 2010; Mechnikov, 07 May 2018].

Kaliningrad Region: Chern. (Insterburg), Gur. (Gross Raum, Königsberg), Zel. (Loppöhnen, Neuhäuser, Warnicken); Krasn., Zel.

Comments: Sporadically distributed and occasional species associated with forest edges and encountered in cattle and sheep dung.

7. A. luridus (Fabricius, 1775)

Bercio & Folwaczny 1979; Alekseev & Sakhnov 2000.

Voucher specimens: 6 [1 km NE Kaliningrad, 28 May 1996, 2 exp.; Zelenogradsk, 27 April 1997; Kolosovka, 2 June 2001, 2 exp.; Kumachevo, 16 June 2001] .

Kaliningrad Region: Gur. (Königsberg), Oz.

(Trempen); Bagr., Gur., Zel.

Comments: Sporadically and occasionally encountered species of open mesophilic habitats associated with cattle dung. The color variation with entirely black elytrae is more common in the Kaliningrad Region.

8. A. rufipes (Linnaeus, 1758)

Lentz 1879; Bercio & Folwaczny 1979; Alekseev & Sakhnov 2000; Alekseev & Shapoval 2011a,

b, 2013, 2016; Alekseev 2014.

Voucher specimens: 9 [Dolzhanskoe, 29 June 1997, 2 exp.; Zelenogradsk, 10 June 2000; 23 km of the Curonian Spit, 14 August 2008, 2 exp.; ibidem 11 September 2015, 2 exp.; Kostrovo, 10 September 2018, 2 exp.].

Kaliningrad Region: Bagr. (Ludwigsort), Chern. (Insterburg), Gur. (Juditten, Königsberg, Wernsdorf, Wilkie), Zel. (Kurische Nehrung, Rauschen, Warnicken); Bagr., Chern., Krasn., Nem., Nest., Zel.

Comments: This quite eurytopic species favors different forest habitats (including forest edges and large parks) and is widely distributed and frequent in the Kaliningrad Region.