Deinopteroloma obtortum, Assing, 2015

Assing, Volker, 2015, Three new species of Deinopteroloma from Vietnam and China (Coleoptera: Staphylinidae: Omaliinae), Linzer biologische Beiträge 47 (2), pp. 1217-1227 : 1225-1226

Deinopteroloma obtortum nov.sp. ( Figs 7-8 , 15-18 , 23-25 , Map 1 )

T y p e m a t e r i a l: Holotype 3: " CHINA [16] - S-Gansu, S Longnan, Min Shan, 33°03'13''N, 104°40'57''E, 2200 m, 6.VIII.2012, V. Assing / Holotypus 3 Deinopteroloma obtortum sp.n. det. V. Assing 2015 " (cAss). Paratype ♀: same data as holotype, but leg. M. Schülke (cSch).

E t y m o l o g y: The specific epithet is the past participle of the Latin verb obtorquere (to bend back) and alludes to the shape of the parameres of the aedeagus.

D e s c r i p t i o n: Body length 4.8-5.4 mm; length of forebody 4.4-5.0 mm. Coloration: head dark-brown, with the frons paler brown; pronotum dark-brown with the lateral margins broadly dark-yellowish; elytra dark-brown; legs dark-brown with the tibiae partly paler brown and the tarsi dark-yellowish to yellowish-brown; antennae with antennomeres I-IV reddish-brown and V-XI dark-brown to blackish-brown; maxillary palpi yellowish.

Head ( Fig. 7 ) deeply impressed near eyes; median and posterior portions of dorsal surface with three partly interrupted transverse series of coarse punctures situated in narrow impressions; between these impressions with smooth and glossy elevations; all impressions and posterior portion of head with coarse punctures; frons elevated and with very shallow transverse microsculpture posteriorly and more distinct transverse microsculpture anteriorly. Antenna 2.3 mm long and shaped as in Fig. 8 .

Pronotum ( Fig. 7 ) 1.54-1.56 times as broad as long and 1.63 times as broad as head; lateral margins irregularly and very coarsely serrate; middle of lateral portions with very deep impression, in front of and behind this impression with smooth area; in anterior two-thirds of median portion with two more or less oblong smooth tubercles on either side of middle; postero-laterally with smaller tubercle on either side; postero-median portion with a distinct impression; between smooth elevations with very coarse punctation.

Elytra ( Fig. 15 ) 2.6-2.7 times as long as pronotum and 1.36-1.45 times as long as combined width; lateral margins smoothly and weakly curved in dorsal view; punctation coarse and arranged in partly irregular series (except for posterior portion of elytra), these series interrupted by 15-20 pronounced smooth tubercles on each elytron; posterior fifth of elytra without tubercles. Legs rather long and moderately stout; femora, particularly metafemur, moderately dilated; metatibia ( Fig. 16 ) 1.5 mm long; meso- and metatibiae very weakly bisinuate.

3: protarsomeres I-IV very weakly dilated; aedeagus ( Figs 17-18 , 23-25 ) 1.4 mm long; both parameres slender, apically bent dorsad and extending beyond apex of median lobe; left paramere slightly longer than right paramere; internal sac with a long dark membranous structure and apically with two series composed of small and weakly sclerotized spines.

I n t r a s p e c i f i c: The paratype differs from the holotype by less pronounced and less oblong antero-median elevations of the pronotum, less strongly serrate lateral margins of the pronotum, and slightly less numerous tubercles on the elytra.

C o m p a r a t i v e n o t e s: This species is characterized particularly by the distinctive aedeagus with parameres apically bent dorsad, rather large size, the presence of distinct elevations on the pronotum and elytra, and the coarsely and irregularly serrate lateral margins of the pronotum. It additionally differs from the geographically closest congener, D. gracile (Shaanxi, Sichuan), by larger body size, a more transverse head, a much broader and more transverse pronotum, less slender elytra, distinctly darker coloration of the pronotum, elytra, legs, and antennae, more coarsely and irregularly serrate lateral margins of the pronotum, much more numerous and much more pronounced elevations on the elytra, and less coarse and less distinctly seriate punctation of the elytra. For illustrations of the aedeagus of D. gracile , whose parameres are much more slender, less sclerotized, and of subequal length (right paramere slightly longer than the left paramere), see SMETANA (2001).

D i s t r i b u t i o n a n d b i o n o m i c s: ThetypelocalityissituatedintheMin Shan to the south of Longnan, southern Gansu ( Map 1 ), at an altitude of 2200 m. The specimens were sifted from moist litter and roots in a secondary pine forest with hazelnut.

Figures

Map 1: Distribution of Deinopteroloma in Asia east of the Himalaya: D. semiflavum and D. diabolicum (black star); D. obtortum (black circle); D. gracile (white circles); D. uncinatum and D. dispar (white star); D. tricuspidatum and D. hamatum (white square); D. chiangi (black diamonds).

Figs 1-8: Deinopteroloma uncinatum nov.sp. (1-3), D. dispar nov.sp. (4-6), and D. obtortum nov.sp. (7-8): (1, 4, 7) head and pronotum; (2, 5) elytra; (3, 6, 8) antenna. Scale bars: 1.0 mm.

Figs 9-18: Deinopteroloma uncinatum nov.sp. (9-11), D. dispar nov.sp. (12-14), and D. obtortum nov.sp. (15-18): (9, 12, 16) metatibia and metatarsus; (10-11, 13-14, 17-18) aedeagus in dry preparation in lateral and in ventral view; (15) elytra. Scale bars: 9, 12, 15-16: 1.0 mm; 10-11, 13- 14, 17-18: 0.5 mm.

Figs 19-25: Deinopteroloma uncinatum nov.sp. (19-20), D. dispar nov.sp. (21-22), and D. obtortum nov.sp. (23-25): aedeagus in transparent light in lateral and in ventral view. Scale bar:: 0.5 mm.