Lypoglossa lateralis Mannerheim 1830

4. Lypoglossa lateralis (Mannerheim, 1830)

(Figs. 72–78)

Oxypoda lateralis Mannerheim, 1830: 70.

Oxypoda (s. str.) lateralis: Fenyes, 1920: 366 (as valid species). Oxypoda (s. str.) lateralis: Bernhauer & Scheerpeltz, 1926: 748 (as valid species).

Atheta (Acrotona) lateralis: Brundin, 1952: 101 (as valid species).

Atheta (Megacrotona) lateralis: Scheerpeltz, 1968: 159 (as valid species). Megacrotona lateralis: Benick and Lohse, 1974: 103 (as valid species). Lypoglossa lateralis: Lohse & Smetana, 1985: 294 (as valid species). Lypoglossa lateralis: Hoebeke,1992: 396 (as valid species).

(Other references for Lypoglossa lateralis are omitted)

Type material. Lectotype of Oxypoda lateralis (designated by Hoebeke (1992)): FIN­ LAND: 30 km NW Turku, Villnas (MZHF).

Additional material. RUSSIA: Murmansk Reg.: 5 specimens, 20 km SSE Kirovsk, pifall traps, 15.vi–15.viii.1994 (M.Kozlov) (ZMUN); Tyumen’ Reg.: Ψ, Agap River, 22.vi.1988 (Ye.Zinov’yev) (ZMUN); Magadan Reg.: ɗ, Ψ, 25 km N Magadan, in grass, 3.vii.1985 (Yu.M.Marusik); 6 specimens, 30 km N Magadan, Snezhnaya Dolina, viii– ix.1996 (Yu.M.Marusik); 2ɗɗ, Ψ, ditto but 12–14.ix.1996; ɗ, upper reaches of the Kolyma River, Jack London Lake, Studyonyy Creek, 13.vii.1986 (Yu.M.Marusik); 3 specimens, upper Kolyma River, Bol’shoy Annachag Mt. Range, env. of Sibit­Tyellakh, Olen’ River, 800m, Alnus, Pinus pumila, in forest litter, 15.vii.1985 (Yu.M.Marusik) (ZMUN); Chukotkskiy Aut. Distr.: 8 specimens, E Chukotka, upper reaches of the Bol’shaya Osinovaya River (a tributary of the Belaya River), Chosenia, in forest litter, 13.vii.1989 (Yu.M.Marusik); 11 specimens, 10 km E Amguema, 22.vii.1988 (Yu.M.Marusik) (ZMUN).

Diagnosis. Lypoglossa lateralis differs from all Nearctic species of Lypoglossa in having more uniform and darker body color; asperate punctation of head and pronotum; slightly transverse antennal segments 6–10; and a different shape of the aedeagus and spermatheca (Figs. 72–78).

Description. Length 3.6–4.0 mm. Head and abdomen dark brown; pronotum dark brown or brown, in most specimens with light margins; elytra dark brown to brown, with lighter oblique area stretching from humeral angle to sutural angle; legs brown, mouthparts and antennae dark brown.

Head surface glossy, with weak isodiametric microsculpture, with strong and asperate punctation, distance between punctures equals 1–1.5 times their diameter. Eyes 1.2–1.5 times as long as temples. Antennal article 4 elongate, 5 subquadrate, 6–10 slightly transverse (Fig. 13).

Pronotum transverse, 1.5 times as wide as head, width 0.81–0.94 mm, length 0.59– 0.67 mm, width to length ratio 1.4; surface glossy, with weak isodiametric microsculpture, punctation asperate and denser than on head, distance between punctures equals their diameter. Elytra wider (0.97–1.11 mm) and longer (0.73–0.86 mm; measured from humeral angle) than pronotum (elytral length to pronotal length ratio 1.3), 1.3 times as wide as long, surface glossy, with poorly visible microsculpture; punctation asperate, denser and stronger than on pronotum, distance between punctures equal to ½–1 times their diameter.

Abdominal terga with very fine (poorly visible at 70x) microsculpture consisting of transverse waves; terga 3–5 matte due to fine and dense punctation, distance between punctures equals 1–3 times their diameter, terga 6–7 glossy, with sparser punctation, distance between punctures equals 2–6 times their diameter.

Aedeagus as in Figs. 72–77.

Spermatheca as in Fig. 78.

Distribution. Lypoglossa lateralis is a Palaearctic species restricted to subarctic, northern boreal and alpine forests. Examined specimens from Murmansk and Magadan Regions, and Chukotka Peninsula were identical in all external characters and in the shape of the male and female genitalia.

Natural History. Lypoglossa lateralis occurs in forest litter.