Scaphisoma montivagum, 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 : 1376-1377

5.2.7.15. Scaphisoma montivagum nov.sp. ( Figs 99, 100 )

T y p e m a t e r i a l: Holotype 6: Philippines: Luzon Mount Data Lodge 2200-2300 m 22- 23.XII.79 Deharveng-Orousset /6 100 (MHNG).

D e s c r i p t i o n: Length 1.50 mm, width 0.97 mm. Head, thorax and elytra dark reddish-brown, subapical areas of elytra somewhat darkened, sternites 1 to 4, femora and tibiae somewhat lighter, tarsi and antennae lighter than tibiae, almost yellowish. Pronotum and elytra not microsculptured and not iridescent. Length/width ratio of antennomeres as: III 12/7: IV 20/6: V 24/8: VI 31/9: VII 42/12: VIII 32/9: IX 39/12: X 38/11: XI 40/12. Pronotum very finely and densely punctate, punctures distinct at 30 times magnification, lateral contours evenly rounded, lateral margin carinae not visible in dorsal view, lateral striae impunctate. Exposed tip of scutellum minute. Elytra with lateral margin carinae not visible in dorsal view; apical margins slightly rounded, inner apical angles rounded, not prominent, situated in level with outer angles; sutural margin not raised, sutural striae fairly deep, shortly bent at base, not extending along basal margins, parallel from level of scutellar tip toward apical third, slightly converging apices, punctate; adsutural areas narrow, finely punctate; lateral striae appearing impunctate. Discal punctation fine and fairly dense, coarser than pronotal punctation, most puncture intervals about twice to four times as large as puncture diameters, punctation distinctly coarser on small lateral area anterior middle third of lateral length. Hind wings well developed. Hypomera and mesanepisterna smooth. Mesepimera distinctly shorter than intervals to mesocoxae and about three times as long as wide. Median part of metaventrite slightly convex, lacking impressions or stria, densely and fairly coarsely punctate; lateral parts of metaventrite sparsely and very finely punctate; antecoxal puncture rows and microsculpture absent. Submesocoxal areas 0.05 mm, about as third of intervals to apical margin, submesocoxal lines convex, very finely punctate. Metanepisterna flat, wide, narrowed anteriad, with rounded inner margins, sutures deep. Tibiae straight. Abdomen with distinct strigulate microsculpture absent from basolateral areas of sternite 1; punctation sparse and very fine; submetacoxal areas about 0.04 mm, about as fourth of intervals to apical margin, submetacoxal lines convex, with distinct marginal punctures.

M a l e: Protarsomeres 1 to 3 weakly widened. Aedeagus ( Figs 99, 100 ) 0.28 mm long, symmetrical, weakly sclerotized. Apical processes of median lobe almost as long as basal bulb, inflexed, with ventral side weakly concave, almost evenly thick and with blunt tip in dorsal view; articular processes prominent. Parameres wide in basal halves and strongly narrowed posterior mid-length (dorsal view), almost evenly wide posterior basal part and straight in lateral view, reaching somewhat beyond tip of median lobe. Internal sac without rods or flagellum, with weakly sclerotized, minute spines.

Etymology: The species epithet is a Latin adjective meaning walking in mountains.

C o m p a r a t i v e n o t e s: This species may be distinguished from its congeners of similar body-size and colour by the strigulate abdominal microsculpture, the median part of the metaventrite notably coarser punctate than the lateral parts or the abdomen, the convex subcoxal lines, the elongate antennomere IV and the minute aedeagus, in combination.

Figures

Figs 95 - 100: Aedeagi of Scaphisoma in dorsal and lateral views; (95, 96), S. minutipenis nov. sp.; (97, 98), S. mirum nov. sp.; (99, 100), S. montivagum nov. sp. Scale = 0.1 mm.