Scaphisoma distinctum, 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 : 1421-1422

5.2.19.7. Scaphisoma distinctum nov.sp. ( Figs 199, 200 )

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

D e s c r i p t i o n: Length 1.78 mm, width 1.20 mm. Head, most of prothorax, abdomen and appendages ochreous. Basal margin of pronotum blackish. Anterior two thirds of elytra black, prevailing apical third of elytra yellowish, apical margins of elytra narrowly darkened. Mesothorax and metathorax dark brown. Pronotum and elytra not microsculptured and not iridescent. Length/width ratio of antennomeres as: III 15/8: IV 50/7: V 55/8: VI 44/10: VII 48/15: VIII 40/9: IX 53/14: X 50/14: XI 63/14. Pronotum with punctation hardly visible, lateral margins evenly rounded, lateral margin carinae not visible in dorsal view, lateral striae impunctate. Exposed tip of scutellum minute. Elytra convex, with anterior halves of lateral margin carinae exposed in dorsal view, apical margins rounded, inner apical angles not prominent, situated posterior level of outer angles; sutural margin not raised, sutural striae shallow, shortly bent at base, not extended along basal margins, gradually and weakly converging posteriad, very finely punctate; adsutural areas narrow, flat, each with single puncture row, lateral striae impunctate. Elytral disc with punctation very shallow, hardly visible though with some punctures larger than those on pronotum. Hind wings fully developed. Hypomera and mesanepisterna smooth. Mesepimera shorter than intervals to mesocoxae, about three times as long as wide. Metaventrite not microsculptured, very finely and sparsely punctate. Median part of metaventrite convex, with mesal stria and shallow apicomedian impressions; antecoxal puncture rows absent. Submesocoxal areas 0.04 mm, about as thirds of intervals to metacoxae, submesocoxal lines convex, indistinctly punctate, punctures not extended by striae. Metanepisternum convex, slightly narrowed anteriad, inner margin almost straight, impressed, suture deep. Tibiae straight. Abdomen with strigulate microsculpture and very finely and sparsely punctate; sternite 1 with submetacoxal areas 0.02 mm, about as tenth of intervals to apical margin of sternite, submetacoxal lines parallel, coarsely punctate.

M a l e: Protarsomeres and mesotarsomeres 1 to 3 distinctly widened. Aedeagus ( Figs 199, 200 ) 0.75 mm long, symmetrical. Basal bulb and to part dorsal side of apical process of median lobe weakly sclerotized. Apical process strongly inflexed, gradually narrowed, with acute tip in lateral view, two fairly sclerotized dorsal valves joint and raised at their bases. Parameres conspicuously wide, with inner lobes very densely strigulate. Internal sac lacking rods, with row of sclerotized teeth and very dense membranous denticular structures.

E t y m o l o g y: The species epithet is a Latin adjective meaning distinct.

C o m p a r a t i v e n o t e s: This species is unique by its colour pattern and by the shape of the aedeagus. It strongly reduced submetacoxal areas and parallel submetacoxal lines are as unusually in the group and similar as in S. palawanum and S. inopportunum.

Figures

Figs 194 - 200: Aedeagi of Scaphisoma; (193), S. dispar LÖBL, in lateral view, without proximal part of basal bulb, scale = 0.05 mm; (195), ditto, internal sac in dorsal view, scale = 0.05 mm; (196), S. disparides nov. sp., in dorsal view, scale = 0.1 mm; (197), ditto, in lateral view, without proximal part of basal bulb, scale = 0, 0 5 mm; (198), ditto, internal sac in dorsal view, scale = 0.05 mm; (199, 200), S. distinctum nov. sp., in dorsal and lateral views, scale = 0.2 mm.