Scaphisoma tricoloripenne, Ivan Löbl & Ryo Ogawa, 2016

Ivan Löbl & Ryo Ogawa, 2016, On the Scaphisomatini (Coleoptera, Staphylinidae, Scaphidiinae) of the Philippines, IV: the genera Sapitia ACHARD and Scaphisoma LEACH, Linzer biologische Beiträge 48 (2), pp. 1339-1492 : 1437-1438

5.2.21.6. Scaphisoma tricoloripenne nov.sp. ( Figs 41, 242, 243 )

T y p e m a t e r i a l: Holotype 6: Luzon Baguio / 1924 / Staatliches Museum für Tiekunde Dresden (SMTD). Paratypes: with the same data as the holotype, 4 66, 4♀♀ (SMTD, MHNG).

Description: Length 2.20-2.55 mm, width 1.55-1.75 mm. Head ochreous. Pronotum blackish along basal margin, dark brown to blackish on mesal area, ochreous or brown laterad dark mesal area. Hypomera ocreous. Elytra each dark brown to black along basal and lateral margins, on adsutural areas, along sutural stria, and with dark brown or blackish spot situated anterior light apical area, joined to dark lateral margins but not to dark adsutural area. Apical fourth of elytra yellowish. Meso- and metaventrite brown. Antennae and legs light brown to ochreous. Abdomen light brown to yellowish. Length/width ratio of antennomeres as: III 15/11: IV 64/8: V 95/9: VI 77/9: VII 83/12: VIII 68/8: IX 82/12: X 75/12: XI 80/14. Elytra with sutural striae parallel in anterior section, gradually converging from mid-length to apices. Submesocoxal areas 0.03-0.04 mm, about as seventh of intervals to metacoxae. Sternite 1 all over extremely finely punctate, with submetacoxal areas 0.08 mmn about as third of intervals to apical margin.

Most of other external characters similar to those in S. tricoloratum and S. tridens. M a l e: Dark mesal area of pronotum narrow. Apical margins of elytra weakly oblique, with inner apical angles situated somewhat posterior level of outer angles. Protarsomeres 1 strongly widened, about as wide as apices of protibiae, protarsomeres 2 somewhat narrower, protarsomeres 3 weakly widened. Mesotarsomeres 1 and 2 strongly widened, mesotarsomeres 1 wider than apices of mesotibiae. Sternite 6 flat in middle. Aedeagus ( Figs 242, 243 ) 1.58-1.72 mm long. Apical process of median lobe with ventral branch short, strongly inflexed and strongly narrowed apically, with a hump in lateral view, tip blunt. Dorsal branch of median lobe short, almost reaching level of tip of ventral branch. Internal sac with large proximal U-shaped sclerite, two long, tooth-like admesal sclerites, central plate narrowed and tooth-like apically, and very dense rows of apical spine-like structures.

F e m a l e: Dark mesal areas of pronotum extended to cover most of the disc. Apical margins of elytra strongly oblique and truncate, with inner angles denticulate, situated far posterior outer angles.

E t y m o l o g y: The species epithet is Latin, meaning tricoloured elytra.

Comparative notes: The females of this species may be easily distinguished by the unique shape of the elytral apices. The males are characterized by the colour pattern of the pronotum and elytra, in combination with the very short apical process of the median lobe and the shape of the sclerites of the internal sac.

Figures

Figs 242 - 246: Aedeagi of Scaphisoma in dorsal and lateral views, in lateral view without right paramere; (242, 243), S. tricoloripenne nov. sp.; (244, 245); S. tridens nov. sp.; (246), ditto, right paramere in ventral view. Scale = 0.3 mm.