Thinodromus shavrini, 2020

Gildenkov, M. Yu., 2020, Three new species of the genus Thinodromus Kraatz, 1857 from Indonesia and the Philippines (Coleoptera: Staphylinidae: Oxytelinae), Russian Entomological Journal 29 (2), pp. 148-152 : 151-152

Thinodromus (s.str.) shavrini Gildenkov , sp.n.

Figs 3 , 10–12 .

MATERIAL. Holotype, ♂, Philippines, Mindanao Island : with labels “ PHILIPPINES: Mindanao, Davao prov., Mt. Talomo (Mts. Apo) 1200–1300 m 7°04´40.9´´N 125°29´02.3´´E, 27– 28.04.2019, Shavrin A.V. leg.” ( DUISB) . Paratypes: 3♂♂, 2♀♀, 2 ex. “ PHILIPPINES: Mindanao, Davao prov., Mt. Talomo ( Mts. Apo ) 1200–1300 m 7°04´40.9´´N 125°29´02.3´´E, 27– 28.04.2019, Shavrin A.V. leg.” ( DUISB; 1♂, 1 ex. — cMG); 1♂ “ PHILIPPINES: Mindanao , Davao prov., Mt. Talomo ( Mts. Apo ), Gatigan , 800–1000 m 7°01´22.0´´N 125°22´30.5´´E, 29.4– 01.05.2019, Shavrin A.V. leg.” ( DUISB) .

DESCRIPTION (holotype). Length 3.9 mm. Colouration dark-brown, legs, 1st, 2nd and 9–11th segments of antennas and apex of elytra brown. Integument slightly shining, body with fairly long light-coloured seta.

Head transverse, with a wide base, ratio of its length (from posterior margin of head to anterior margin of clypeus) to maximum width is about 27:40. Neck constriction prominent. Eyes large, convex, occupying almost entire lateral side of head; eye diameter in dorsal view is about 3.5 times as long as temple length ( Fig. 3 ). Head surface with clearly, finely and dense punctation. The diameter of the punctures is about 1.5 times smaller than the diameter of the eye facet. Distance between punctures is much smaller than their diameter, interspaces smooth, slightly shining ( Fig. 3 ). Antennae long, with lengths of all antennal segments noticeably or significantly longer than their width ( Fig. 3 ).

Pronotum heart-shaped, reaches its greatest width after about 2/3 of its length measured from the base, then narrowed ( Fig. 3 ). Ratio of pronotum length to its maximum width about 40:47. Surface of pronotum with clearly, finely and dense punctation. Diameter of punctures is slightly smaller than the diameter of an eye facet. Distance between punctures is much smaller than their diameter, interspaces smooth, slightly shining ( Fig. 3 ). Base of pronotal disc with distinct horseshoe-shaped depression ( Fig. 3 ); central part of disc with 2 symmetrical distinct weakly developed oval depressions.

Ratio of length of elytra to their combined width is about 68:73. Elytra with clearly, finely and dense punctation. Diameter of punctures is slightly more than the diameter of an eye facet. Distance between punctures is much smaller than their diameter, interspaces smooth, slightly shining ( Fig. 3 ).

Abdomen with fine and dense punctation, shining. Aedeagus of characteristic structure ( Figs 10–11 ).

Female. Sexual dimorphism is absent, female morphologically similar to male. Spermatheca of characteristic structure ( Fig. 12 ).

COMPARATIVE REMARKS. The species is distinguished by large sizes, a narrow body with a small head, clear, fine and dense punctation of the surface of the body. Reliably different in the structure of the aedeagus ( Figs 10–11 ).

DISTRIBUTION. Philippines ( Fig. 13 ).

ETYMOLOGY.The species is named after Alexey Valeryevich Shavrin, a well-known expert in the biology and taxonomy of Coleoptera , who collected the type series.

Acknowledgements. The author wishes to thank all colleagues for making material available for study: Alexey Shavrin (DUISB); Giulio Cuccodoro (MHNG) and Harald Schillhammer (NHMW). I also thank Kirill Makarov for taking the photos (Moscow Pedagogical State University, Russia).

Figures

Figs 1–3. Thinodromus spp., holotypes, males, dorsal view: 1 — Thinodromus (s. str.) coronatus, sp.n.; 2 — Thinodromus (s. str.) makarovi, sp.n.; 3 — Thinodromus (s. str.) shavrini, sp.n. Рис. 1–3. Thinodromus spp., голотипы, самцы, сверху: 1 — Thinodromus (s. str.) coronatus, sp.n.; 2 — Thinodromus (s. str.) makarovi, sp.n.; 3 — Thinodromus (s. str.) shavrini, sp.n.

Figs 4–12. Genitalia of Thinodromus: 4–6 — T. coronatus, sp.n.; 7–9 — T. makarovi, sp.n.; 10–12 — T. shavrini, sp.n.; 4, 7, 10 — aedeagus, ventral view (holotypes); 5, 8, 11 — aedeagus, lateral view (holotypes); 6, 9, 12 — spermatheca (paratypes). Scale bars: 0.25 mm. Рис. 4–12. Гениталии Thinodromus: 4–6 — T. coronatus, sp.n.; 7–9 — T. makarovi, sp.n.; 10–12 — T. shavrini, sp.n.; 4, 7, 10 — Эдеагус, сниЗу (голотипы); 5, 8, 11— Эдеагус, сбоку (голотипы); 6, 9, 12 — сперматека (паратипы). МасШтаб: 0,25 мм.

Figs 13–14. Distribution of Thinodromus: 13 — T. coronatus, sp.n. (black circles) and T. shavrini, sp.n. (black squares) in Philippines; 14 — T. makarovi, sp.n. in Indonesia. Рис. 13–14. Распространение Thinodromus: 13 — T. coronatus, sp.n. (черные круги) и T. shavrini, sp.n. (черные квадраты) на Филиппинах; 14 — T. makarovi, sp.n. в ИндонеЗии.