Scaphisoma hexameroides, 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 : 1402

5.2.14.6. Scaphisoma hexameroides nov.sp. ( Figs 148, 149 )

T y p e m a t e r i a l: Holotype 6: Palawan Olanguan (0-50m) between Puerto Princesa - Roxas 1.IX.1985 M. Sakai (EUMJ). Paratype: with the same data as the holotype, 1♀ (MHNG). D e s c r i p t i o n: Length 1.55-1.60 mm, width 1.10-1.15 mm. Body light reddishbrown, apical fourth of elytra, apical abdominal segments and appendages lighter. Pronotum and elytra not microsculptured and not iridescent. Length/width ratio of antennomeres as: III 15/8: IV 20/7: V 30/7: VI 50/9: VII 50/10: VIII 40/9: IX 45/12: X 45/12: XI 60/14. Pronotum very finely and densely punctate, with lateral margins evenly rounded, lateral margin carinae in male visible, in female concealed (dorsal view), lateral striae punctate. Exposed tip of scutellum minute. Elytra with lateral margin carinae hardly visible in dorsal view, apical margins rounded, inner apical angles not prominent, situated about in level with outer angles; apical half of sutural margin raised, sutural striae fairly deep, starting at each side of pronotal lobe, parallel slightly converging apically, finely punctate; adsutural areas narrow, flat, densely and finely punctate, lateral striae punctate. Elytral disc with punctation dense and fine, less fine than pronotal punctation, puncture intervals much larger large than puncture diameters. Hind wings fully developed. Hypomera and mesanepisterna smooth. Mesepimera somewhat as long as intervals to mesocoxae, about four times as long as wide. Metaventrite not microsculptured, sparsely, very finely punctate. Median part of metaventrite slightly convex, lacking impressions or stria; antecoxal puncture rows absent. Submesocoxal areas 0.04 mm, about as fourth of intervals to metacoxae, submesocoxal lines convex, finely punctate. Metanepisternum flat, weakly narrowed anteriad, inner margin straight except at angles, not impressed below margin of metaventrite. Tibiae straight. Abdomen with strigulate microsculpture, densely and very finely punctate; submetacoxal areas 0.05 mm, about as third of intervals to apical margin of sternite 1, submetacoxal lines convex, distinctly punctate.

M a l e: Protarsomeres 1 and 2 and mesotarsomeres 1 distinctly widened, narrower than apices of respective tibiae. Aedeagus ( Figs 148, 149 ) 0.85 mm long, symmetrical. Apical process of median lobe much shorter than basal bulb, hardly inflexed, with ventral branch narrowed apically and truncate at tip. Parameres not lobed, gradually narrowed apically, bent in apical fourth and overlapping. Internal sac lacking sclerotized pieces, with long spines in apical section, very fine denticular and scale-like structures in large middle section, larger denticles in proximal part.

Etymology: The species epithet derived from hexamerum and refers to the antennomere VI which is comparatively vely long in both species.

C o m p a r a t i v e n o t e s: The species may be distinguished by the length/width ratio of the antennae from its congeners of similar size and coloration and sharing strigulate abdominal microsculpture and lacking antecoxal puncture rows. The shape of the apically truncate apical process of the aedeagus is diagnostic. The aedeagus of the holotype is unusually flat, possibly because teneral.

Figures

Figs 146 - 150: Aedeagi of Scaphisoma; (146, 147), Scaphisoma cuyunon nov. sp., in dorsal and lateral views, scale = 0.1 mm; (148, 149), S. hexameroides nov. sp., in dorsal and lateral views, scale = 0.2 mm; (150), S. iridescens nov. sp., in lateral view, scale = 0.2 mm.