Scaphisoma tagalog, 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 : 1396-1397

5.2.13.13. Scaphisoma tagalog nov.sp. ( Figs 138, 139 )

T y p e m a t e r i a l: Holotype 6: Burungkot, Upi, Cotabato Prov., Mindanao El. 1500ft. I,1- 6, 1947 /under bark of smooth barked soft log / CNHM-Philippine Zool.Exped. (1946-47) F.G.Werner leg. (FMNH).

D e s c r i p t i o n: Length 1.72 mm, width 1.17 mm. Head and body reddish-brown, apical fourth of elytra somewhat darkened, narrow area anterior apical fourth lighter than remaining elytral surfaces; ventral side of thorax hardly lighter than pronotum and elytra, abdomen distinctly lighter, with apical segment almost yellowish, appendages light reddish-brown. Pronotum and elytra not microsculptured and not iridescent. Length/ width ratio of antennomeres as: III 12/9: IV 17/7: V 30/9: VI 35/13: VII 50/16: VIII 30/13: IX 49/17: X 45/16: XI 55/16. Pronotum finely and densely punctate, punctures distinct at 25 times magnification, lateral margins evenly rounded, lateral margin carinae not visible in dorsal view, lateral striae with hardly visible punctures. Scutellum completely concealed. Elytra convex, with lateral margin carinae not exposed in dorsal view, apical margins truncate, inner apical angles not prominent, situated in level with outer angles; sutural margin raised, sutural striae deep, bent at base, not extended along basal margins, converging apically, finely punctate; adsutural areas narrow, flat, each with single puncture row, lateral striae punctate. Elytral disc with punctation fine, coarser than that on pronotum and dense, on small lateral areas anterior mid-length conspicuously denser and coarser, with punctures about as large as puncture intervals.

Hind wings fully developed. Hind wings fully developed. Hypomera and mesanepisterna smooth. Mesepimera somewhat shorter than half of intervals to mesocoxae, subtriangular, about 1.5 times as long as wide. Metaventrite not microsculptured. Median part of metaventrite flattened, densely and fairly coarsely punctate posterior level of mesocoxae, with punctures to part about as large as puncture intervals, punctures between mesocoxae and lateral parts of metaventrite with very fine and sparse punctation; setal patch and antecoxal puncture rows absent. Submesocoxal areas 0.05 mm, about as third of intervals to metacoxae, submesocoxal lines convex, distinctly punctate, punctures not extended by striae. Metanepisternum flat, narrowed anteriad, inner margin rounded near apical angle, almost straight in middle, suture deep. Tibiae straight. Abdomen not microsculptured, punctation very fine and sparse, except on median area of sternite 1 bearing distinct punctures; submetacoxal areas 0.07 mm, about as half of intervals to apical margin of sternite, submetacoxal lines convex, distinctly punctate.

M a l e: Protarsomeres 1 to 3 distinctly widened. Aedeagus ( Figs 138, 139 ) 0.53 mm long, asymmetrical, strongly sclerotized. Median lobe with fairly large basal bulb and prominent, robust articular process. Apical process of median lobe tubular, with subapical ostium, conspicuously notched ventrally (lateral view). Parameres almost evenly wide posterior bases and curved, with very narrowly membranous inner margins. Internal sac with strongly sclerotized, simple flagellum; spines and scale-like structures absent. E t y m o l o g y: The species epithet is the name of one of Philippine languages.

C o m p a r a t i v e n o t e s: The aedeagus with a deep ventral notch and the short subtriangular mesepimera are diagnostic. The species may be distinguished also by the elytra darkened apically and bearing a lateral patch of coarse punctures, in combination with the antennomere IV notably longer than III.

Figures

Figs 137 - 141: Aedeagi of Scaphisoma; (137), S. scapulare nov. sp., apical part of median lobe with extruded internal sac, scale = 0.1 mm; (138, 139), S. tagalog nov. sp., aedeagus in dorsal and lateral views, scale = 0.1 mm; (140, 141), S. angulosum nov. sp., aedeagus in dorsal and lateral views, scale = 0.2 mm