Scaphisoma oviforme, 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 : 1393-1394

5.2.13.8. Scaphisoma oviforme nov.sp. ( Figs 129, 130 )

T y p e m a t e r i a l: Holotype 6: Burungkot, Upi, Cotabato Prov., Mindanao El. 1500ft. I-6-1947 / CNHM-Philippine Zool.Exped. (1946-47) F.G.Werner leg. (FMNH). D e s c r i p t i o n: Length 1.60 mm, width 1.08 mm. Head, dorsal side of body and femora uniformly dark reddish-brown, upper part of hypomera lighter than pronotum, mesoventrite and metaventrite darker than pronotum, apical abdominal segments, tibiae, tarsi and antennae lighter reddish-brown. Pronotum and elytra not microsculptured and not iridescent. Length/width ratio of antennomeres as: III 12/8: IV 20/7: V 29/8: VI 37/8: VII 43/14: VIII 30/10: IX 45/14: X 46/14: XI 55/15. Pronotum very finely and densely punctate, with lateral margins evenly rounded, lateral margin carinae not visible in dorsal view, lateral striae impunctate. Scutellum concealed. Elytra convex, with lateral margin carinae not 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, bent at base, not extended along basal margins, parallel posteriad except near apices, very finely punctate; adsutural areas narrow, flat, each with single puncture row, lateral striae impunctate. Elytral disc with punctation very fine, coarser than that on pronotum, dense. Hind wings fully developed. Hypomera and mesanepisterna smooth. Mesepimera about as halves of intervals to mesocoxae and about three times as long as wide. Metaventrite not microsculptured, very finely and sparsely punctate. Median part of metaventrite slightly convex, without stria or impressions; antecoxal puncture rows absent. Submesocoxal areas 0.03 mm, about as fifth of intervals to metacoxae, submesocoxal lines parallel, punctate, punctures not extended by striae. Metanepisternum flat, slightly narrowed anteriad, inner margin almost straight, impressed. Tibiae straight. Abdomen with punctulate microsculpture, very finely punctate. Sternite 1 with submetacoxal areas hardly 0.02 mm, about as eleventh of intervals to apical margin of sternite, submetacoxal lines parallel, coarsely punctate.

M a l e: Protarsomeres 1 to 3 slightly widened. Aedeagus ( Figs 129, 130 ) 0.40 mm long, asymmetrical, weakly sclerotized. Median lobe with small, oviform basal bulb (dorsal view), convex articular process, very narrow and strongly curved apical process, apical section of latter filiform. Parameres strongly asymmetrical, right parameres widest in subapical section (lateral view), very narrow in apical section. Left parameres strongly widened apically, in apical section membranous. Flagellum of internal sac very narrow. E t y m o l o g y: The species epithet refers to the egg-like shape of the basal bulb of the aedeagus, in dorsal view.

Comparative notes: This species shares with S. palawanum and S. inopportunum reduced submetacoxal areas, with parallel lines. It may be distinguished from these species, as from other members of the group by the aedeagal characters.

Figures

Figs 126 - 130: Aedeagi of Scaphisoma; (126), S. inconventum nov. sp., in lateral view; (127, 128), S. inopportunum nov. sp., in dorsal and lateral views; (129, 130) S. oviforme nov. sp., in dorsal and lateral views. Scale = 0.1 mm.