Scaphidium ahrensi Tu & Tang

Tu, Yue-Ye & Tang, Liang, 2017, Supplement to the knowledge of the genus Scaphidium Olivier of East China (Coleoptera: Staphylinidae: Scaphidiinae), Zootaxa 4268 (4), pp. 593-596 : 593-595

Scaphidium ahrensi Tu & Tang , new species ( Figs. 1–6 )

Type material. CHINA: Fujian: Holotype: ♂, glued on a card with labels as follows: “ Kuatun (2300m) 27,40n. Br. 117,40ö. L. J. Klapperich 18.2.1938 (Fukien)” “ Holotype / Scaphidium ahrensi / Tu & Tang ”[red handwritten label] ( ZFMK) . Paratypes: 1 3 1 ♀, same data as for the holotype ( SHNU, ZFMK) ; 1 ♀, same data except for 30.5.1938. ( ZFMK) .

Description. BL: 5.5–6.1 mm.

Body black and glossy, tibiae slightly lighter, antennal segments I–VI, maxillary palpi and tarsomeres brownish. Frons densely but shallowly punctuate with an impunctate portion on vertex, punctures mostly round and well delimited. Pronotum raised above elytra, with lateral edges slightly sinuate. Antebasal puncture row impressed; disc densely punctuate, punctures round and well delimited, puncture intervals mostly a little smaller than puncture diameters. Elytra with humeral protuberance indistinct, apical portion moderately impressed; discal punctation a little smaller and sparser than that of pronotum, punctures on apical portion a little larger; each elytron with two indistinct discal puncture rows consisting of coarser punctures; basal stria row impressed, with punctures about as coarse as those of pronotal antebasal row; sutural stria puncture row much finer. Prohypomera smooth with few indistinct punctures. Mesanepisterna smooth. Exposed abdominal sternites and tergites with coarse and relatively sparse punctures and densely reticulate microsculpture.

Male. Metaventrite impressed in middle, with long semi-erect pubescence. Profemora ( Fig. 6 ) with inner side expanded gradually from base forming an acute angle at basal 3/5, ventral side with tubercles arranged in one row; protibiae ( Fig. 6 ) slightly incurved in lateral view with one indistinct tubercles row on inner side and small subapical angle. Aedeagus ( Fig. 3 ) with sclerotized internal sac ( Fig. 4 ) consisting of x-shaped apical sclerite and two small basal sclerotized rods.

Distribution. China (Fujian).

Remarks. The new species is related to S. fukiense Pic, 1954 from Fujian, but can be easily distinguished from the latter by the larger size, the black femora (reddish in S. fukiense ) and the spiny male profemora. It is also similar to S. spinatum Tang & Li, 2010 , but differs in the entirely black femora (metafemora and mesofemora black with reddish fasciae in S. spinatum ).

Etymology. The species is named in honor of Dr. Dirk Ahrens who kindly loaned us specimens of the new species.

Figures

FIGURES 1 – 6. Scaphidium ahrensi sp. n. 1, 2 habitus 3 aedeagus 4 internal sac in detail 5 antena 6 male front leg in ventral view. Scales = 1 mm (1, 2, 5, 6), scales = 0.25 mm (3, 4).