New species of the genus Thinobius Kiesenwetter, 1844 from Myanmar (Coleoptera: Staphylinidae: Oxytelinae) Author Gildenkov, M. Yu. Author Semionenkov, O. I. text Russian Entomological Journal 2024 2024-09-30 33 3 280 282 https://doi.org/10.15298/rusentj.33.3.04 journal article 10.15298/rusentj.33.3.04 0132-8069 14683184 Thinobius (s.str.) kimi Gildenkov et Semionenkov , sp.n. Figs 1–3 . МАТЕRIAL. Holotype , ♂ “ MYANMAR : town Old Bagan , 204 km NW city Naypyidaw , Ayeyarwady River bank, 21º10'02"N 94º51'12"E , 05.XI.2022 , UV-lamp light, local time 22:00–00:00, leg. Kim A.Yu. ” ( ZMUM ). Paratypes : 2♂♂ , 1 ♀ “ MYANMAR : town Old Bagan, 204 km NW city Naypyidaw, Ayeyarwady River bank, 21º10'02"N 94º51'12"E , 06.XI.2022 , UV-lamp light, local time 00:00–01:00, leg. Kim A.Yu. ” (cMG; 1 ♀ — ZMUM ) . DESCRIPTION ( holotype ). Body flattened, length 1.3 mm . Colouration brown, legs and antennal base yellowbrown. Integument slightly shining, body with short, lightcoloured hairs. Head flattened, trapezoidal, ratio of its length (from posterior margin of head to anterior margin of clypeus) to maximum width about 11:14. Neck constriction prominent. Temples rectangular with a rounded apex, fairly well-developed. Eyes well-developed, slightly convex. Eye diameter in dorsal view more than 1.5 times exceeds temple length. The diameter of How to cite this article: Gildenkov M.Yu., Semionenkov O. I. 2024 . New species of the genus Thinobius Kiesenwetter , the eye visible from above noticeably exceeds the length of the temple, more than 1.5 times. Head width across eyes slightly exceeds its width across temples ( Fig. 1 ). Head surface with very delicate, very fine and dense punctation. Punctures poorly visible, microsculpture resembles delicate shagreening.Antennae quite long. First antennal segment elongate, cylindrical, more than twice longer its wide; 2 cone-shaped, elongate, approximately twice longer than wide, approximately 1.5 times shorter than 1st and noticeably narrower; 3 cone-shaped, its length barely exceeds its greatest width; 4 slightly cone-shaped, equal in width and slightly shorter than 3; 5–8 slightly cone-shaped, approximately as long as wide, similar in size; 9–10 slightly cone-shaped, slightly longer than wide and noticeably more massive than antennal segments 5–8; 11 slightly wider than 10, elongate, pointed at apex, its length approximately equal to total length of 8 and 9 antennal segments. 9–11 antennal segments forming a loose club. Figs 1–3. Thinobius (s.str.) kimi , sp.n. : 1 — holotype, male, dorsal view; 2 — aedeagus, ventral view, holotype; 3 — aedeagus, lateral view, paratype. Рис. 1–3. Thinobius (s.str.) kimi , sp.n. : 1 — голотип, самец, сверху; 2 — Эдеагус, голотип, сниЗу; 3 — Эдеагус, паратип, сбоку. Pronotum flattened, with rounded base, parallel-sided, widest at base and retained towards the apex ( Fig. 1 ). Ratio of pronotum length to its maximum width about 11:14. Surface of pronotum, like surface of head, covered with extremely delicate, very fine and dense punctation; punctures poorly visible; microsculpture resembles delicate shagreening. Elytra quite long, ratio of its length to maximum width about 20:18. Sutural angles at the apex of elytra rounded, they slightly diverge towards apex along suture ( Fig. 1 ). Elytra covered with extremely delicate, very fine and dense punctation; punctures not distinguishable; microsculpture resembles delicate shagreening. Abdomen covered with smooth shagreening and quite shiny. Aedeagus of characteristic structure ( Figs 2–3 ). Female . Sexual dimorphism absent, female morphologically similar to male. COMPARATIVE REMARKS. The studied original descriptions of all Thinobius species known from the Oriental Biogeographic Region [ Cameron, 1917 , 1924 , 1930 ] allowed us to assume that the species collected in Myanmar is new for a science. Type material for all these species is stored in Natural History Museum in London. Our colleague Alexey Solodovnikov studied the material in NHM and kindly provided us with information about all the type specimens of Thinobius that were of interest to us, confirming our assumption. T. himalaycus differs by lager body size, by shape of pronotum: less parallel-sided, widest before middle and converging anteriad and posteriad (in sp.n. ( Fig. 1 ) pronotum more parallel-sided), and by significantly longer 4–7 antennal segments. T. marinus differs by lager body size, pale elytra with dark triangle spot around scutellum and in head shape which is widest at more developed temples just behind eyes (in sp.n. ( Fig. 1 ) head width across eyes slightly exceeds its width across temples). T. orientalis strongly differs by distinctly transversal head, ca. 2 times as wide as long, by lager size and significantly longer 4–8 antennal segments. T. pruinosus strongly differs by paler colouration, chagreen, not glossy body, more developed eyes, by shape of pronotum, narrowing anteriad and posteriad (in sp.n. ( Fig. 1 ) pronotum parallel-sided) and by longer 5–7 antennal segments. T. simlensis differs in shape of head: more distinctly wider than long, with well-developed temples as long as eyes and by less parallel-sided pronotum converging posteriad (in sp.n. ( Fig. 1 ) pronotum parallel-sided). DISTRIBUTION. Myanmar . ETYMOLOGY. The new species is named after Alexander Kim, an entomologist studying taxonomic group Anthophila, who collected all the material on this species. Acknowledgements . The authors express their gratitude to Alexander Kim for providing the material for study and Alexey Solodovnikov (Natural History Museum of Denmark , Copenhagen), who provided valuable information about the type specimens of Thinobius from the Natural History Museum in London. I also thank Kirill Makarov ( Moscow Pedagogical State University, Russia ) for taking the photographs . Competing interests . The authors declare no competing interests.