Odontacrossus esseri nov.sp. (Figs 1 -4)

T y p e m a t e r i a l: Holotype ♂: Myanmar (Burma), Provinz Kachin State, Pangwa env. (TF)(H = 2.450 m) 28.IX.2010, N 25°37’42.3’’ E 098°23’22.5’’ leg. Michael Langer, S. Naumann & S. Löffler / coll M. Langer / Odontacrossus esseri sp. nov. HOLOTYPE det. A. Bellmann 2018 (CAB); Paratypes ♂ ♀: same data as holotype, 3♀♀ (CAB, CML); China-Yunnan, Yanmen, 13.6.- 23.6.2005, lgt. E. Kučera / Aphodius pseudoobenbergeri / Odontacrossus esseri sp.nov. PARATYPE det. A. Bellmann 2018, 1♂, 2♀♀ (CAB); China, W-Yunnan, NE of Fuggong, Nujiang massiv, 3440 m, 26°57’32’’N, 98°56’44’’E, 14.VI.2017, leg. Reuter / Odontacrossus esseri sp. nov. PARATYPE det. A. Bellmann 2018, 1♂, 1♀ (CAB, CCR).

E t y m o l o g y: The new species is dedicated to my friend and colleague Jens Esser (Berlin, Germany), specialist of Cryptophagidae, who accompanied me in the study of Coleoptera for the last 30 years.

D e s c r i p t i o n: 6.8-7.3 mm. Body elongate, convex. Dorsal surface with weak microreticulation, moderately shiny. Elytra apically and laterally with short setae. Colour of body entirely piceous-black, elytra with the apex rather broadly dark reddish-brown, pronotum laterally sometimes reddish brown. Legs piceous, antennal club black.

M a l e: Habitus as in Figs 1-3. Head large, without tubercles; clypeal margin semicircular with a triangular process protruding from the middle of the clypeal margin; genae nearly angulate, eyes distinctly protruding. Frontal suture finely impressed. Epistoma nearly flat. Punctation simple, with regularly distributed punctures, interstices 3 -5 times as wide as diameter of punctures.

Pronotum transverse, anterior angles rounded and feebly protruding. Sides subparallel, posterior angles truncate. Basal margin protruding posteriorly, weakly sinuate on either side. Lateral margins thickly bordered, basal and anterior margin not bordered. Lateral margins without any setae. Punctation double with regularly distributed small punctures, and scattered bigger punctures on disc and on sides, in basal half medially with a short impunctate line.

Scutellum triangular, basally with several punctures.

Elytron long, 1.3 times as long as combined width of elytra, widest at middle. Humerus with denticle. Striae narrow, moderately deep and weakly crenulate. Punctation of intervals slightly finer and sparser than that of head and pronotum; intervals feebly convex, laterally and apically with short setae.

Protibiae of normal shape, externally with three triangular teeth and 6 small denticles, apical spur acuminate, slightly curved outwards. First metatarsomere as long as the following three combined, as long as superior spur. Claws as in Fig. 6.

Metasternal plate feebly concave, finely microreticulated, with some small irregular punctures, marginal punctures with few short erect setae, medially with indistinctly impressed line.

Aedeagus as in Figs 4-5.

Epipharynx as in Fig. 10.

F e m a l e: Clypeal margin without a triangular process protruding from the middle of the clypeal margin; punctation of pronotum coarser and denser. Metasternal plate feebly concave, shiny, finely microreticulated, with some irregular punctures, medial with weakly impressed line, glabrous.

D i a g n o s i s: Odontacrossus esseri nov.sp. is most similar to O. obenbergeri (BALTHASAR, 1932). It differs from the latter in size, shape of the claws (Figs 6-7), punctation of the head and pronotum and in the male genitalia. Both species are easily separated by using the key provided below.

D i s c u s s i o n: One specimen (author´s collection) of Odontacrossus pseudoobenbergeri (ČERVENKA, 1995) was found together with the type material of O. esseri in one of the localities China-Yunnan, Yanmen. The species was recorded from this locality also by DELLACASA et al. 2014.