Nazeris raptus, Assing, 2017

Assing, Volker, 2017, A revision of Nazeris X. The first record of the genus from South Vietnam and additional records from Thailand (Coleoptera: Staphylinidae: Paederinae), Linzer biologische Beiträge 49 (2), pp. 1017-1022 : 1018-1021

Nazeris raptus nov.sp. ( Figs 1-5 , Map 1 )

T y p e m a t e r i a l: Holotype 3: "S VIETNAM: Lâm Dông Prov., Lac Durong Distr., Bidoup Nuiba Natl Park, surr. Giang Ly Ranger Station (1420-1460 m a.s.l.) 16-21.VI.2015 / legit L. Bartolozzi, G. Chelazzi, S. Bambi, F. Fabiano, E. Orbach, V. Sbordoni (n. Magazzino 3023) / Holotypus 3 Nazeris raptus sp.n. det. V. Assing 2017 " (VNMN). Paratypes: 2♀♀: same data as holotype (MZUF, cAss) [paratype in MZUF registered as MZUF 18321].

E t y m o l o g y: The specific epithet is the past participle of the Latin verb rapere (to abduct) and alludes to the fact that the type locality is situated far outside the previously known range of the genus.

D e s c r i p t i o n: Body length 5.1-5.7 mm; length of forebody 2.8-3.0 mm. Coloration: body black; legs and antennae yellow.

Head ( Figs 1-2 ) oblong, 1.03-1.05 times as long as broad; median portion of dorsal surface somewhat elevated; punctation dense, coarse, umbilicate, and partly confluent; interstices forming narrow ridges. Eyes less than one-third as long as distance from posterior margin of eye to posterior constriction of head.

Pronotum ( Fig. 1 ) 1.23-1.27 times as long as broad and 0.91-0.92 times as broad as head; punctation very coarse, much coarser than that of head; midline with a narrow and somewhat elevated glossy band; postero-laterally with an irregular oblong glossy elevation on either side.

Elytra ( Fig. 1 ) 0.52-0.54 times as long as pronotum; punctation coarse, dense, and deep, slightly less coarse than that of pronotum.

Abdomen broader than elytra; punctation very dense and distinct on tergites III-VI, finer and less dense on tergites VII and VIII; interstices without microsculpture; posterior margin of tergite VII with or without an indistinct rudiment of a palisade fringe.

3: posterior margin of sternite VII weakly concave in the middle; sternite VIII ( Fig. 5 ) weakly transverse, with dense and unmodified pubescence, posterior excision broadly and shallowly V-shaped, only 0.13 times as deep as length of sternite; aedeagus ( Figs 3- 4 ) 0.65 mm long; ventral process with broad and shallow V-shaped excision apically; dorso-lateral apophyses stout, straight, apically nearly extending to apex of ventral process.

C o m p a r a t i v e n o t e s: This species is characterized by coarse, umbilicate, and partly confluent punctation of the head, very coarse punctation of the pronotum, a very shallow posterior excision of the male sternite VIII, and particularly by the morphology of the aedeagus (dorso-lateral apophyses very stout and straight).

D i s t r i b u t i o n a n d n a t u r a l h i s t o r y: Thetypelocalityissituatedat about 12°08'N, 108°32'E in South Vietnam, at an altitude of approximately 1450 m. One of the paratypes is teneral.

C o m m e n t: Remarkably, the type locality of N. raptus is situated in the Oriental region, nearly 6.5 degrees of latitude farther south than that of N. siamensis , previously the southernmost representative of the genus ( Map 1 ). This unexpected discovery casts doubt on the previous zoogeographic classification of Nazeris as essentially South Palaearctic.

Figures

Map 1: Pooled distribution of all described Nazeris species based on revised material and reliable literature records. Star: type locality of N. raptus.

Figs 1-5: Nazeris raptus nov.sp.: (1) forebody; (2) head; (3-4) aedeagus in lateral and in ventral view; (5) male sternite VIII. Scale bars: 1: 1.0 mm; 2: 0.5 mm; 3-5: 0.2 mm.