Scaphisoma subplanatum, 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 : 1354-1355

5.2.2.5. Scaphisoma subplanatum nov.sp. ( Figs 50, 51 )

T y p e m a t e r i a l: Holotype 6: Meran, E. slope Mt. Apo, Davao Province, Mindanao 6000 ft; XI: 5: 1946 /Lot 100 on polypore6 39 Fomes applanatus / CNHM-Philippine Zool. Exped. (1946-47) F.G. Werner leg. (FMNH). Paratypes: with the same data as the holotype, 1 6 (MHNG); with the same data but XI: 7: 46, 1 6 (FMNH); with the same data but XI: 8: 46, 1 ex. sex not examined (MHNG); Mindanao, Cotabato Prov., Burungkot, Upi, 1500 ft., 1-9.I.1947, lot 167: on fermenting sap of freshly cut tree, leg. F.G. Werner, 1 ex. sex not examined (FMNH).

Description: Length 1.18-1.44 mm, width 0.87-1.07 mm. Body black or blackish-brown. Appendages brown. Pronotum and elytra not microsculptured and not iridescent. Length/width ratio of antennomeres as: III 8/8: IV 12/7: V 20/8: VI 30/11: VII 47/16: VIII 23/11: IX 40/14: X 37/16: XI 45/16. Pronotum very finely and sparsely punctate, with lateral margins evenly rounded, lateral margin carinae not visible in dorsal view, lateral striae impunctate. Exposed tip of scutellum small. Elytra somewhat flattened, with lateral margin carinae visible near bases and posterior mid-length in dorsal view, apical margins rounded, inner apical angles not prominent, situated posterior level of outer angles; sutural margin not or slightly raised, sutural striae fairly deep, bent at base, not extending along basal margin, parallel from level of scutellar tip to mid-length, converging posterior mid-length, fairly coarsely punctate; adsutural areas narrow, flat, each with single dense and coarse puncture row, lateral striae distinctly punctate. Elytral disc with punctation hardly visible on large humeral area and along lateral margin. Remaining punctation conspicuously coarse and very dense, with punctures to part larger than puncture intervals and well delimited, becoming finer and sparser near sutural striae. Hind wings fully developed. Hypomera and mesanepisterna smooth. Mesepimera indistinct, fused. Metaventrite not microsculptured. Median part of metaventrite weakly convex, with two admesal impressions, punctation dense, fairly distinct in impressions, sparse and very fine on remaining surface of metaventrite; antecoxal puncture rows absent. Submesocoxal areas 0.07 mm, about as half of intervals to metacoxae, submesocoxal lines convex, finely punctate, punctures not extended by striae. Metanepisternum flat, narrowed anteriad, inner margin curved, suture not conspicuously deep. Tibiae straight. Abdominal sternite 1 lacking obvious microsculpture, very finely and sparsely punctate, except on small basomedian area bearing distinct punctures; submetacoxal areas 0.14 mm, about twice as intervals to apical margin of sternite, submetacoxal lines strongly convex, distinctly punctate. Following ventrites with punctulate microsculpture. M a l e: Protarsomeres 1 to 3 weakly widened. Aedeagus ( Figs 50, 51 ) 0.32 mm long, symmetrical, with basal bulb weakly sclerotized and very small. Median lobe with articular processes large, prominent, subglobular in lateral view. Apical process of median lobe simple, about as long as basal bulb, hardly inflexed, gradually narrowed in dorsal and lateral views. Parameres fairly wide and short, broadened apically in lateral view, narrowed posterior bases in dorsal and lateral views, with membranous apical parts. Internal sac simple, with very narrow flagellum, spines and scale-like structures absent. E t y m o l o g y: The species epithet is derived from the Latin sub, meaning below, and the adjective planatum meaning flat.

C o m p a r a t i v e n o t e s: This species is very similar to S. subgracile. It differs by the darker coloration of the body, the fairly coarse punctation near elytral apices, the antennomere XI almost three times as long as wide, and, more significantly, by the aedeagus with short and apically widened parameres.

Figures

Figs 46 - 51: Aedeagi of Scaphisoma in dorsal and lateral views; (46, 47), S. simplexoides nov. sp.; (48, 49), S. subgracile nov. sp.; (50, 51), S. subplanatum nov. sp. Scale = 0.1 mm.