Scaphisoma glabrellum, 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 : 1425-1426

5.2.19.11. Scaphisoma glabrellum nov.sp. ( Figs 209-211 )

T y p e m a t e r i a l: Holotype 6: Mindanao, 30km NW of Maramag 13-17 May Bagongsilang, 1700m Bolm lgt., 1996 (SMNS).

D e s c r i p t i o n: Length 2.20 mm, width 1.50 mm. Head, body, femora and tibiae ochreous, apical fourth of elytra lighter, almost yellowish, narrow area anterior apical fourth somewhat darkened. Apical abdominal segments, tarsi and antennae yellowish. Pronotum and elytra not microsculptured and not iridescent. Length/width ratio of antennomeres as: III 14/9: IV 63/7: V 75/8: VI 60/9: VII 63/15: VIII 50/9 [following antennomeres broken off, missing]. Pronotum very finely and sparsely punctate, punctures hardly visible at 50 times magnification; lateral contours evenly rounded, lateral margin carinae not visible in dorsal view, lateral striae appearing impunctate. Exposed tip of scutellum small. Elytra with lateral margin carinae not visible in dorsal view, apical margins truncate, inner apical angles not prominent, situated about in level with outer angles; sutural margin not raised; sutural striae fairly deep, curved at base, not extended along basal margins, parallel to apical third, weakly converging in apical third, impunctate; adsutural areas narrow, flat, very finely punctate, lateral striae appearing impunctate; discal punctation sparse, as fine as pronotal punctation, with puncture intervals often more than five times as large as puncture diameters. Hind wings fully developed. Mesepimera about as long two thirds of intervals to mesocoxae, about three times as long as wide. Metaventrite not microsculptured, very finely and sparsely punctate. In middle weakly convex, with two deep apicomedian impression; antecoxal puncture rows absent. Submesocoxal areas 0.03 mm, about as sixth of intervals to metacoxae, submesocoxal lines weakly convex, distinctly punctate. Metanepisternum flat, parallel-sided, inner margin straight, rounded at anterior angles, impressed below margin of metaventrite. Mesotibiae and metatibiae straight [protibiae missing]. Abdomen with strigulate microsculpture, very finely punctate, submetacoxal areas 0.03 mm, about as seventh of intervals to apical margin of sternite 1, submetacoxal lines slightly convex, distinctly punctate.

M a l e: [Protarsomeres broken off, missing]. Sternite 6 with outer apical angles prominent, margin in-between truncate, mesal lobe absent ( Fig. 211 ). Mesotarsomeres 1 and 2 distinctly widened, narrower than apices of mesotibiae. Aedeagus ( Figs 209, 210 ) 1.18 mm long, symmetrical, strongly sclerotized. Apical process of median lobe tapering, inflexed (lateral view), with slightly bent and acute tip. Articular process robust, not prominent. Parameres strongly widened, with large, densely striate ventral lobes and complex bases. Internal sac with row of strongly sclerotized teeth, and dense, weakly sclerotized denticular structures.

E t y m o l o g y: The species epithet is a Latin adjective meaning somewhat smooth. C o m p a r a t i v e n o t e s: The aedeagal characters of this new species are similar to those in S. toxopeusi LÖBL, 1966 described from Buru, though has the dorsal side of the apical process is not split in the latter species, suggesting its relationships to members of the S. pictum group ( LÖBL 1976: 11). The extruded internal sac in the holotype of S. glabrellum obscures comparison. Both species may be readily distinguished by their external characters, in particular by the significantly smaller body, the apically darkened elytra and the absence of abdominal microsculpture in S. toxopeusi.

Figures

Figs 207 - 211: Scaphisoma; (207, 208); S. furcillatum nov. sp. aedeagus in dorsal and lateral views, scale = 0.2 mm; (209, 210), S. glabrellum nov. sp., aedeagus in dorsal and lateral views, internal sac extruded, scale = 0.2 mm; (211), ditto, apical part of male sternite 6, scale = 0, 2 mm.