Thinodromus (s. str.) lenisus Gildenkov, 2019

Gildenkov, M. Yu., 2019, New species of the genus Thinodromus Kraatz, 1857 (Coleoptera: Staphylinidae, Oxytelinae) from India and Nepal, Far Eastern Entomologist 381, pp. 15-20 : 16-19

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

http://zoobank.org/NomenclaturalActs/ 59A08AD5-4619-44D6-9465-5A010238B3A3

Figs 1 , 4–6

TYPE MATERIAL. Holotype – ♂, North India: Uttarakhand state, with labels “N-

INDIA: Uttaranchal state ca. 13km NW Nainital Khairna Bridhe env. 900–1000m, 13–17.VII

2003 leg. Z. Kejval & M. Trýzna ” ( NHMW). Paratypes: the same labels as holotype, 1♂ ,

6♀♀, 7 ex. ( NHMW, cMG); Central India: Madhya Pradesh state, Hoshangabad district ,

with labels “ INDIA: ( MP13 ) southern Madhya Pradesh Hoshangabad Dist. River Denwa ,

28.II 2008 leg. M.Jäch, S&P Sharma” and “ca. 8 km SSE Matkuli Satpura Range ca. 400 m

22°34´29´´N / 78°29´43´´E ”, 1♀ ( NHMW); Nepal : Narayani province, Chitwan National Park ,

with labels “ NEPAL: Chitwan NP Narayani Ganga, 18.4.1995 27°33´N 84°06´E 150m, leg .

Malicky”, 1♂, 1♀, 1 ex. ( NHMW); Narayani province, with labels “ NEPAL, Prov. Narayani

Sauraha, Rapti River Ufer, 180 m NN, 27°34´80´´N, 84°29´49´´E LF 18.IV 2000, leg. A.

Weigel”, 2♂♂, 4♀♀, 1 ex. ( NKME, cMG); Koshi province, Sankhuwasabha district, with labels “ NEPAL, Prov. Koshi distr. Sankhuwasabha Tumlingtar , Arun-Ufer, 27°19.08´N ,

87°10.05´E 310m NN, 26.XI 1998 leg. M. Hartmann ”, 1♀, 1 ex. ( NKME); Lumbini province, with labels “ NEPAL Tounsa (sigoudi) Kaynali R. XI 1987 P. Morvan ” and

“Rougemont collection”, 1♂, (cGR).

DESCRIPTION. MALE (holotype). Length about 3.0 mm. Colouration black, legs, antennae and mouthparts brown; integument slightly shining. Body with short, light-coloured hairs ( Fig. 1 ).

Head transverse, ratio of its length (from posterior margin of head to anterior margin of clypeus) to maximum width about 24:40. Temples barely developed, eyes large, convex,

occupy entire lateral surface of head ( Fig. 1 ). Head surface with exceedingly delicate, fine and dense punctation; individual punctures barely discernible. Puncture diameter incommen-

surably smaller than eye facet, distances between punctures slightly longer than their diameter.

Antennae long, antennal segments 1–8 elongate; segments 9–10 slightly elongate; segment

11 elongate, conical ( Fig. 1 ).

Pronotum wide, rounded, ratio of pronotum length to its maximum width about 33:45.

Lateral margins of pronotum with 1 small tooth basally ( Fig. 1 ). Surface of pronotum with exceedingly delicate, fine and dense punctation; individual punctures barely discernible.

Punctation similar to that on head, but punctures almost indiscernible ( Fig. 1 ). Base of pro-

notal disc with prominent horseshoe-shaped depression ( Fig. 1 ); central part of disc with 2

small, shallow, symmetrical, oval depressions and 1 oval, shallow depression along pronotum midline near its anterior margin ( Fig. 1 ).

3.0 mm); 2 – T. bernhaueri ( Mongolia, length – 3.2 mm); 3 – T. schuelkei ( China: Hubei,

length – 2.6 mm).

Elytra wide, ratio of length of elytra to their combined width about 55:64. Surface of elytra with delicate, fine and dense punctation. Puncture diameter about 6 times as small as eye facet, distances between punctures slightly smaller than their diameter ( Fig. 1 ).

Abdomen delicately shagreened ( Fig. 1 ).

Aedeagus of characteristic structure ( Figs 4–5 ). Sclerotised anterior rib of paramere not extending onto its plane, posterior edge of paramere slightly extended posteriorly at base and with small notch near midline, closer to apex ( Fig. 5 ), anterior shield of internal sac of aedeagus shaped as 2 wide, low plates, rounded toward outer margin ( Fig. 4 ).

FEMALE. Similar to male in colouration and body proportions, sexual dimorphism absent.

Spermatheca equally divided ( Fig. 6 ).

DIAGNOSIS. The new species belongs to the sericatus species group. It is similar to T.

sericatus and T. sundukowi that have very fine punctation on the surface of the pronotum

(which is barely discernible in contrast to an almost completely indistinct punctation in T.

lenisus) and very fine and dense punctation on the surface of elytra, but differs in having a smaller size, indistinct punctation on the surface of the pronotum and a different structure of

( Mongolia); 9, 10 – T. schuelkei ( China: Hubei); 4 – aedeagus, dorsal view; 7, 9 – edeagus without paramers, dorsal view; 5, 8, 10 – paramers, lateral view; 6 – spermatheca, lateral view.

Scale bars: 0.25 mm.

the aedeagus (Gildenkov, 2000a: 148, fig. 15; 2001: 827, fig. 2). T. lenisus can be distingui-

shed from all other species of the sericatus species group by very fine punctation on the surface of the elytra and indiscernible punctation on the surface of the pronotum ( Figs. 1 ). It is clearly distinguishable from T. eminens and T. puetzi by the structure of the aedeagus

(Makranczy, 2016: 159, figs. 13–17; Gildenkov, 2000a: 23). T. lenisus is most similar in the structure of the aedeagus ( Figs 4, 5, 7–10 ) to T. bernhaueri and T. schuelkei ( Figs 2, 3 ). The aedeagus of T. lenisus differs in the shape of the anterior shield of the internal sac, which is shaped as two wide, low plates, rounded toward the outer margin; in T. bernhaueri and T.

schuelkei, the anterior shield of the internal sac is shaped as two rather short, straight plates

( Figs 4, 7, 9 ). The aedeagus of the new species also differs in having darker parameres. It can be differentiated from the aedeagus of T. schuelkei by a distinct notch on the posterior margin of the parameres ( Fig. 5 ).

DISTRIBUTION. India, Nepal.

ETYMOLOGY. From Latin “ lenis ” (smooth) referring to the lack of apparent punctation on the surface of the pronotum.

Figures

Figs 1–3. Thinodromus spp., body, dorsal view. 1 – T. lenisus sp. n. (holotype, length –

Figs 4–10. Thinodromus spp. 4–6 – T. lenisus sp. n. (holotype); 7, 8 – T. bernhaueri