Quedius (Microsaurus) trachelos, Ejean, 2015

Ejean, 2015, Contributions to the knowledge of the Quediina (Coleoptera: Staphylinidae: Staphylinini) of China. Part 56. Genus Quedius STEPHENS, 1829 Subgenus Microsaurus DEJEAN, 1833. Section 23, Linzer biologische Beiträge 47 (2), pp. 1843-1854 : 1845-1846

Quedius (Microsaurus) trachelos nov.sp. ( Figs 9-15 )

T y p e l o c a l i t y China: Hainan, Wuzhishan City, Shuiman Village, Wuzhishan Nature Reserve, 650- 700 m.

T y p e m a t e r i a l: Holotype (): CHINA: " CHINA: Hainan Prov. Wuzhishan City Shuiman Village Wuzhishan N. R. 650-700 m, 21-IV-2012 Peng & Dai leg.". In SNUC . Paratypes: Hainan: same data as holotype, 6 ( ASC, SNUC) ; Lingshui County, Diaoluoshan N. R., 1000 m, 24-IV- 2012, Peng & Dai leg., 1 ( SNUC) .

D e s c r i p t i o n. In all characters similar to Q. zeuxis , including impunctate large middle portions of first two visible tergites, but different by a few external characters and particularly by the differently shaped aedoeagus. Eyes markedly larger, tempora considerably shorter than eyes from above (ratio 0.11, corresponding value for Q. zeuxis 0.41); both posterior frontal puncture and temporal puncture touching eye margin (both separated from eye margin by diameter of puncture in Q. zeuxis ); punctuation of elytra somewhat denser, transverse interspaces between punctures about as large as diameters of punctures (at least twice as large as diameters of punctures in Q. zeuxis ).

Male. First four segments of front tarsus moderately dilated, each densely covered with tenent setae ventrally; segment two about as wide as apex of tibia; segment four narrower than preceding segments. Sternite 8 very sparsely setose, with two long setae on each side; with inconspicuous, subarcuate medioapical emargination, no impunctate flattened area before emargination present ( Fig.9 ). Genital segment with tergite 10 markedly narrowed toward arcuate apex, with several setae at and near apex, otherwise asetose ( Fig. 10 ); sternite 9 with very narrow, elongate basal portion, apical portion with subtruncate to somewhat emarginated apex, with four differentiated apical setae, otherwise sparsely setose ( Fig.11 ). Aedoeagus ( Figs 12-15 ) similar to that of Q. zeuxis , but apical portion of median lobe markedly longer; on face adjacent to paramere with arcuate transverse carina, appearing as large dent in lateral view ( Fig.14 ); paramere of similar shape as that of Q. zeuxis , with four long apical setae on apical margin and with two finer and shorter setae on each apical corner; underside with eight to nine finer sensory peg setae forming irregular group below apex (six coarser sensory setae situated at apical margin in Q. zeuxis ).

Female unknown.

Length 5.5- 6.5 mm.

E t y m o l o g y. The specific epithet is the Greek noun τραχηλος (bull-necked). It refers to the wide neck of the species.

G e o g r a p h i c a l d i s t r i b u t i o n. The species is at present know from two localities on the island of Hainan.

B i o n o m i c s.Nothingisknown about the collecting circumstances of the specimens of the original series, except that they were collected at low elevations around 1000 m.

R e c o g n i t i o n a n d c o m m e n t s Quedius trachelos is also similar to Q. auchenias , but it differs, in addition to the markedly different aedoeagus, by the smaller size, by the position of both posterior frontal and temporal punctures on the head, and by the presence of impunctate large middle portions of the first two visible abdominal tergites.

Quedius auchenias nov.sp. and Q. trachelos nov.sp., together with Q. zeuxis , belong to the Zeuxis -species group, members of which share the following character states: collum wide, only vaguely or not at all constricted behind eyes, separated from head only by a superficial fine line, or continuous with head; scutellum impunctate, but with very fine transverse rugae on basal portion, basal portion in addition mostly slightly depressed; elytra each with three additional, inconspicuous longitudinal rows of several coarser punctures bearing longer stiff setae; lateral face of middle tibiae with numerous strong spines. Previously ( SMETANA, 1995:49 and SMETANA, 2001: 211) I considered Q. zeuxis as a member of the Placidus - group, based on the presence of additional, inconspicuous longitudinal rows of coarser punctures on the elytra. The two groups share the characteristic type of elytral punctuation, however, the wide neck and the characteristic scutellum leave no doubt that the three above species form a separate species group.

Figures

Figs 1-14: 1-8. Quedius auchenyas nov.sp.: (1) apical portion of male sternite 8; (2) tergite 10 of male genital segment; (3) sternite 9 of male genital segment; (4) aedoeagus, ventral view; (5) apical portion of median lobe, paramere removed; (6) apical portion of underside of paramere with sensory peg setae; (7) apical portion of aedoeagus, lateral view; (8) tergite 10 of female genital segment. 9-14. Quedius trachelos sp. nov.: (9) apical portion of male sternite 8; (10) tergite 10 of male genital segment; (11) sternite 9 of male genital segment; (12) aedoeagus, ventral view; (13) apical portion of median lobe, paramere removed; (14) apical portion of aedoeagus, lateral view.

Figs 15-29: (15) Quedius trachelos nov.sp.: apical portion of underside of paramere with sensory peg setae. (16, 17) Quedius kurbatovi nov.sp.: tergites 10 of female genital segment. (18-24) Quedius norvegorum nov.sp.: (18) apical portion of male sternite 8; (19) tergite 10 of male genital segment; (20) sternite 9 of male genital segment; (21) aedoeagus, ventral view; (22) apical portion of median lobe, paramere removed; (23) apical portion of underside of paramere with sensory peg setae; (24) tergite 10 of female genital segment. 25-29. Quedius koltzei: (25) tergite 10 of male genital segment; (26) sternite 9 of male genital segment; (27) aedoeagus, ventral view; (28) apical portion of underside of paramere with sensory peg setae; (29) tergite 10 of female genital segment.