Scaphidium bituberculatum, Tang & Li, 2012

Tang, Liang & Li, Li-Zhen, 2012, Two new species of the genus Scaphidium from China (Coleoptera: Staphylinidae: Scaphidiinae), Acta Entomologica Musei Nationalis Pragae 52 (1), pp. 185-192 : 190-191

Scaphidium bituberculatum sp. nov.

( Figs. 5, 6 , 13–16 )

Type locality. China, Hainan Prov., Lingshui County, Diaoluoshan National Reserve, 18°43.37′N, 109°52.00′E.

Type material. HOLOTYPE: J, China, Hainan Prov., Lingshui County, Diaoluoshan N. R., 16–17.VII.2006, Z.-L. WANG & C. GAO leg. ( HBUM) . PARATYPE: ♀, with the same data as the holotype ( HBUM).

Description. Body reddish brown with femora darker and tibiae blackish; antennal club black except last segment brownish on apical half; elytra each with two large yellow spots: one on humeral portion and another one on apicolateral portion. Antennae ( Fig. 16 ) with similar coloration to those in S. yinziweii sp. nov.

Body measurements: BL: 7.0– 7.1 mm, ED: 0.29 mm, PL: 2.23–2.32 mm, PW: 3.04–3.31 mm, EW: 3.48–3.65 mm.

Head with punctation clearly present only on posterior portion of frons, which is moderately coarse, dense and shallow. Pronotum distinctly elongate, strongly convex at base, antebasal puncture row deeply impressed, pronotal disc with punctation similar to that of posterior portion of frons. Elytron with two yellow spots: humeral spot strongly convex, subapical spot weakly convex. Lateral margin of elytron with prominent anterior subapical spot. Elytral disc with punctures moderately to very coarse and arranged to form irregular lines. Prohypomera uneven, with several scattered shallow punctures. Mesepisterna very sparsely and very shallowly punctate. Exposed abdominal tergites with coarse punctures and reticulate microsculpture. Ventrite I with coarse punctures restricted onto medio-basal portion, reticulate microsculpture covering its entire surface.

Male. Metaventrite with long pubescence covering nearly entire median portion. Profemora ( Fig. 15 ) distinctly longer than those of female, inconspicuously tortuose on about half, ventral sides with row of small tubercles. Protibiae ( Fig. 15 ) distinctly incurved, with two rows of small ventral tubercles.Aedeagus ( Fig. 13 ) with internal sac ( Fig. 14 ) comprising longitudinal apical sclerite and complicated complex of basal sclerites which consists of several median sclerites and a pair of large and elongate lateral sclerites.

Differential diagnosis. Scaphidium bituberculatum sp. nov. is similar to S. direptum Tang & Li, 2010 ( TANG & LI 2010b) ( Figs. 7, 8 ) from Guangdong Province due to the presence of prominent elytral spots. It may be easily distinguished from the latter species by its elongate pronotum, strongly convex elytral spots and different male sexual characters, in particular by the ventrally tuberculate profemora and protibiae.

Etymology. The specific name is a combination of the Latin prefix bi- and the adjective tuberculatum, referring to its strongly prominent humeral spots.

Habitat. Unknown

Distribution. China (Hainan). Known only from the type locality.

Figures

Figs. 5–8. Male habitus of Scaphidium Olivier, 1790. 5–6 – S. bituberculatum sp. nov., holotype; 7–8 – S. direptum Tang & Li, 2010, paratype. Scale bars: 1 mm.

Figs. 13–16. Scaphidium bituberculatum sp. nov. 13 – aedeagus; 14 – internal sac; 15 – male front leg; 16 – antenna. Scale bars: 0.25 mm (13–14); 1 mm (15–16).