Scaphisoma casiguran, 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 : 1366-1367

5.2.7.4. Scaphisoma casiguran nov.sp. (Figs 8, 76, 77)

T y p e m a t e r i a l: Holotype 6: Luzon: Lagunas Mt. Makiling, summit rd (SE Los Banos) 600 m I. Löbl, 21-22.XI.95, moss, epiph., bark on logs (MHNG). Paratypes: with the same data as the holotype, 2♀♀ (MHNG).

D e s c r i p t i o n: Length 1.28-1.43 mm, width 0.87-0.95 mm. Head, thorax, most of elytra and abdomen reddish-brown, elytra with lighter, not clearly delimited subhumeral spot and with broad light subapical areas contrasting with dark apices. Appendages light reddish or yellowish-brown. Pronotum and elytra not microsculptured and not iridescent. Length/width ratio of antennomeres as: III 12/6: IV 23/5: V 34/6: VI 36/7: VII 45/11: VIII 41/8: IX 45/10: X 45/10: XI 52/13. Pronotum very finely and densely punctate, with lateral contours evenly rounded, lateral margin carinae not or hardly visible in dorsal view, lateral striae impunctate. Exposed tip of scutellum minute. Elytra with lateral margin carinae entirely and well visible in dorsal view, apical margins weakly rounded, inner apical angles not prominent, situated about in level with outer angles; sutural margin raised, sutural striae deep, bent at base, not extending along basal margin, strongly converging toward apices, coarsely punctate in anterior halves, almost impunctate in apical halves; adsutural areas conspicuously broad anteriad, at least twice as wide at level of scutellar tip as at mid-length, flat, densely and coarsely punctate anterior midlength, with punctures about as large as puncture intervals and larger than most punctures on elytral disc. Adsutural areas narrow and appearing impunctate near apices. Lateral striae distinctly punctate between bases and mid-length. Elytral disc with punctation fairly coarse and very dense near anterior section of sutural striae, becoming very fine toward lateral and apical margins. Hind wings fully developed. Hypomera smooth. Mesanepisterna with strigulate microsculpture. Mesepimera shorter than intervals to mesocoxae, about three times as long as wide. Median part of metaventrite slightly convex, with one central and two apicomesal impressions, strigulate microsculpture evanescent near lateral margins, punctation on prevailing surface of extremely fine and sparse; antecoxal puncture rows absent. Submesocoxal areas 0.03 mm, about as fifth to fourth of intervals to metacoxae, submesocoxal lines parallel, coarsely punctate. Metanepisternum flat, slightly narrowed anteriad, inner margin evenly rounded, suture deep. Tibiae straight. Abdomen with strigulate microsculpture, very finely and sparsely punctate; submetacoxal areas 0.03-0.04 mm, about as fourth of intervals to apical margin of sternite 1, submetacoxal lines weakly convex, finely punctate.

M a l e: Protarsomeres 1 to 3 weakly widened. Aedeagus ( Figs 76, 77 ) 0.52 mm long, symmetrical, with basal bulb narrow, weakly sclerotized. Articular processes large, prominent. Apical process of median lobe fairly long, inflexed, tapering, with acute tip. Parameres in lateral view evenly curved and gradually narrowed, in dorsal view narrowed towards mid-length, weakly curved and evenly narrow in apical third. Internal sac tubular, with minute central denticular tube, single spine and minute sclerites situated apically when extruded.

E t y m o l o g y: The species epithet is a name of one of the Luzon languages. C o mp a r a t i v e n o t e s: The aedeagal characters of S. casiguran are similar to those of the sympatric S. subfasciatum PIC, 1926, though the articular processes are smaller and the apical process of the median lobe is less inflexed. These two species differ drastically by the sutural striae of the elytra which are in S. subfasciatum parallel in the anterior two thirds of the sutural length while they are strongly converging apically in S. casiguran.

Figures

Figs 76 - 82: Aedeagi of Scaphisoma; (76, 77), S. casiguran nov. sp., in dorsal and lateral views, scale = 0.2 mm; (78, 79), S. compactum nov. sp., in dorsal and lateral views, scale = 0.2 mm; (80, 81), S. deharvengi nov. sp., in dorsal and lateral views, scale = 0.2 mm; (82), ditto, paramere in ventral view, scale = 0.1 mm.