Scaphisoma sinuatum, 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 : 1413-1414

5.2.18.9. Scaphisoma sinuatum nov.sp. ( Figs 31, 174, 175 )

T y p e m a t e r i a l: Holotype 6: Luzon: Lagunas Mt. Makiling, summit rd ca 600 m, 28.XI.1995 I. Löbl, fungi on large logs (MHNG). Paratypes: Luzon, with the same data as the holotype, 1 6 (MHNG); with the same data but 21.XI.1995, leaf litter, 1 6 (MHNG); Luzon, Mt. Makiling, 2000 ft., 1.VI.1947, leg. F.G. Werner, 1 6 (FMNH); Luzon, Mt. Makiling, 4 km SE Los Banos, 8.IV.1977, forest litter, leg. L. Watrous, 1 6, 2♀♀ and 9.IV., under bark, 1 6 (MHNG).

D e s c r i p t i o n: Length 1.18-1.30 mm, width 0.80-0.87 mm. Head, thorax, most of elytra and sternite 1 dark, reddish-brown. Elytra with sharply delimited yellowish area covering almost entire apical third. Apical abdominal segments and appendages yellowish. Pronotum and elytra not microsculptured and not iridescent. Length/width ratio of antennomeres as: III 12/7: IV 23/6: V 42/7: VI 35/7: VII 47/11: VIII 35/8: IX 50/12: X 48/12: XI 63/13. Pronotum finely and densely punctate, with lateral contours evenly rounded, lateral margin carinae hardly visible in dorsal view, lateral striae finely punctate. Exposed tip of scutellum minute. Elytra with lateral margin carinae entirely visible in dorsal view, apical margins truncate, inner apical angles not prominent, situated about in level with outer angles; sutural margin not raised, sutural striae deep, starting somewhat posterior level of scutellum, parallel toward apical fourth of sutural length, converging toward apices, coarsely punctate; adsutural areas narrow, flat, densely and fairly coarsely punctate, lateral striae coarsely punctate, epipleural striae distinctly striate. Elytral disc with punctation dense and coarse from bases to apical third, puncture rows distinct, puncture intervals mostly about as large to twice as large as puncture diameters; apical third to two fifth impunctate. Hind wings fully developed. Hypomera and mesanepisterna with strigulate microsculpture. Mesepimera about twice as long as intervals to mesocoxae, about four times as long as wide. Median part of metaventrite convex, lacking mesal or apicomesal impressions or striae and with indistinct microsculpture; punctation coarse and very dense in middle, punctures to part larger and puncture intervals; lateral parts of metaventrite very finely and sparsely punctate; antecoxal puncture rows present, in impressed lines. Submesocoxal areas 0.02-0.03 mm, about as fourth of intervals to metacoxae, submesocoxal lines convex, coarsely punctate. Metanepisternum convex, narrowed anteriad, inner margin rounded, impressed below margin of metaventrite. Tibiae straight. Abdomen with strigulate microsculpture, very finely and sparsely punctate; submetacoxal areas 0.05 mm, about as third of intervals to apical margin of sternite 1, submetacoxal lines convex, coarsely punctate.

M a l e: Protarsomeres 1 to 3 weakly widened. Aedeagus ( Figs 174, 175 ) 0.32-0.37 mm long, symmetrical, weakly sclerotized. Apical process of median lobe narrow, strongly curved in lateral view, with acute apex. Articular process inconspicuous, not prominent. Parameres widened in middle part, narrowed apically, lacking membranous lobes; inner margin strongly sinuate in dorsal view. Internal sac without sclerites, with very fine denticulate structures.

E t y m o l o g y: The species epithet refers to the sinuate shape of the parameres. C o m p a r a t i v e n o t e s: This species is well characterized by the shape of the parameres, as seen in dorsal view. In addition, the ventral side of the apical process is evenly and strongly arcuate, unlike to that in most members of the group.

Figures

Figs 169 - 176: Aedeagi of Scaphisoma; (169), S. ochropenne nov. sp., in lateral view, scale = 0.2 mm; (170), ditto, apical process of median lobe, lateral view, scale = 0.05 mm; (171, 172), S. pseudokalabitum nov. sp., in dorsal and lateral views, scale 0.1 mm; (173), paramere in ventral view, scale = 0.1 mm; (174, 175), S. sinuatum nov. sp., in dorsal and lateral views, scale 0.1 mm; (176), S. stigmatipenne HELLER, in lateral view, scale = 0.1 mm.