Ramussia svetlanae Kurbatov, 2022

Kurbatov, S. A., 2022, Notes on Pselaphinae (Coleoptera: Staphylinidae) of the Sakhalin Region, Russia, Russian Entomological Journal 31 (1), pp. 36-41 : 39-40

Ramussia svetlanae Kurbatov , sp.n.

Figs 17–18, 24 .

MATERIAL. Holotype ♂: S Kunashir, border post Alekhino, litter near thermal spring, 4.08.2011, S. Kurbatov ( ZIN).

DESCRIPTION. Body 1.35 mm long, yellowish brown, in fine, dense decumbent pubescence.

Head 0.21 mm long, 0.29 mm wide. Vertexal foveae quite large, distance between them slightly greater than distance from edge of fovea to inner edge of eye at this level. Frontal sulcus rather V-shaped. Anterior edge of the front roundly angular. Eyes large, convex, their diameter in lateral view about as long as temples. Temples widely rounded. Head only with minute punctures between vertexal foveae. Antennal tubercles weakly protruding. Antennae with scape subcylindrical; pedicel almost 1,5 times as long as wide, hardly narrower than scape; antennomeres 3–6 subequally wide, distinctly narrower than pedicel; antennomere 3 approximately 1,5 times as long as wide, antennomeres 4–5 as long as wide, antennomere 6 hardly wider than long; antennomeres 7–8 hardly wider than long, slightly larger than 6; antennomere 9 less than twice as wide as long, much wider and hardly longer than 8; antennomere 10 twice as wide as long, wider than 9; antennomere 11 more or less conical, slightly wider than 10, as long as 7–10 combined.

Pronotum more or less as long as wide (0.29/ 0.30 mm), widest at its anterior half. Median longitudinal sulcus present, not connected to the median antebasal fovea. Lateral fovea more depressed on the anterior edge. Punctation dense, very fine.

Elytra (0.41/ 0.45 mm) with two basal foveae; discal stria not reaching elytral mid-length.

Male secondary sexual characters on head and legs not expressed. Sternite 6 (VIII) emarginate at apex, notch covered by penial plate (IX sternite) 0.170 mm long ( Fig. 24 ).

Aedeagus ( Figs 17–18 ) 0.270 mm long.

ETYMOLOGY. The species is named after my wife Svetlana Kurbatova, who always helps me a lot both during field work and in processing material.

COMMENTS. The new species is close to R. lovtsovae sp.n. due to the presence of median longitudinal pronotal sulcus and two basal elytral foveae. The differences between species are observed in the proportions of antennomeres 3–5, presence of distinct, though fine punctation of pronotum and especially structure of aedeagus. See also Comments under R. lovtsovae sp.n..

Thus, after the discovery of three new species of the genus Ramussia in the Far East of Russia and the transfer to this genus of the Australian representative [see Chandler, 2001, P.217–220], we make some changes in the description of the genus, namely: mouthparts as in Figs 1–8 ; pronotum with or without median longitudinal sulcus; elytra with two or three basal foveae; male secondary sexual characters can be localized on the front, abdominal sternites, and legs.

There are currently four species from the Russian Far East and one from Australia, namely: Ramussia parabile Kurbatov, 1991 (Primorye); R. captiosum sp.n. (Sakhalin), R. lovtsovae sp.n. (Sakhalin); R. svetlanae sp.n. (Kunashir), R. camponoti ( Lea, 1912) ( Limoniates ) (New South Wales).

In addition, several species not yet described are known to the author from China, and Chandler [2001, P.219] has seen several species from Australia (including Christmas Island), New Britain Island, and Philippines.

Figures

Figs 15–26. Details of the Ramussia spp: 15–16, 23 — R. lovtsovae sp.n.; 17–18, 24 — R. svetlanae sp.n.; 19–20, 25 — R. parabile; 21–22, 26 — R. captiosum sp.n.; 15–22 — aedeagi, dorsally and laterally; 23–26 — IX sternite. Рис. 15–26. Детали строениЯ Ramussia spp: 15–16, 23 — R. lovtsovae sp.n.; 17–18, 24 — R. svetlanae sp.n.; 19–20, 25 — R. parabile; 21–22, 26 — R. captiosum sp.n.; 15–22 — Эдеагусы, дорсально и латерально; 23–26 — IX стернит.

Figs 1–14. Details of the Ramussia spp: 2, 5, 7–8, 10–11, 14 — R. parabile; 1, 3–4, 6, 9, 12–13 — R. lovtsovae sp.n.; 1–2 — mandibles; 3, 8 — labrum; 4–5 — maxillary palpi; 6–7 — mentum with labial palpi; 9–10 — antennae; 11–12 — profemora; 13–14 — metaventrite. Рис. 1–14. Детали строениЯ Ramussia spp: 2, 5, 7–8, 10–11, 14 — R. parabile; 1, 3–4, 6, 9, 12–13 — R. lovtsovae sp.n.; 1–2 — мандибулы; 3, 8 — верхнЯЯ губа; 4–5 — нижнечелюстные Щупики; 6–7 — подбородок с нижнегубными Щупиками; 9–10 — антенны; 11–12 — передние бёдра; 13–14 — метавентрит.