Scaphisoma apomontanum, 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 : 1417-1418

5.2.19.2. Scaphisoma apomontanum nov.sp. ( Figs 182, 183 )

T y p e m a t e r i a l: Holotype 6: E. slope Mt.McKinley, Davao Province, Mindanao VIII: 22: 46 / Elev.: 5200 ft. / Lot 15 in logs / CNHM-Philippine Zool.Exped. (1946-47) F.G.Werner leg. (FMNH). Paratype: Mindanao, Davao Prov., Baclayan, E. slope of Mt. Apo, 6500 ft., 10- 13.XI.1946, original forest sifting humus, leg. F.G. Werner, 1 6 (MHNG).

D e s c r i p t i o n: Length 1.65-1.70 mm, width 1.05-1.15 mm. Head and pronotum blackish, elytra as pronotum or somewhat lighter, hypomera, mesoventrite, femora and tibiae somewhat lighter reddish-brown, metaventrite and metanepisterna about as elytra, sternites 1 to 3 dark reddish-brown, following sternites gradually lighter, abdominal apex, tarsi and antennae yellowish. Pronotum and elytra not microsculptured and not iridescent. Length/width ratio of antennomeres as: III 12/7: IV 30/7: V 43/7: VI 34/8: VII 47/11: VIII 33/9: IX 40/12: X 40/12: XI 48/13. Pronotum irregularly, fairly densely and finely punctate, punctures well delimited, mostly much smaller than puncture intervals, with lateral contours rounded, lateral margin carinae visible in dorsal view, lateral striae punctate. Exposed tip of scutellum minute. Elytra convex, with lateral margin carinae entirely exposed in dorsal view, apical margins rounded, inner apical angles not prominent, situated in level with outer angles; sutural margin not raised, sutural striae deep, slightly bent at base, not extended along basal margins, weakly converging toward apices, finely punctate; adsutural areas narrow, flat, each with single puncture row, lateral striae punctate. Prevailing surface of elytral disc with punctation fairly fine and dense, puncture intervals mostly about twice as large as puncture diameters, including near apices; punctures well delimited, larger than those on pronotum. Hind wings fully developed. Hypomera and mesanepisterna smooth. Mesepimera about twice as long intervals to mesocoxae and about four times as long as wide. Metaventrite in middle flattened, with strigulate microsculpture between mesocoxae and metacoxae, not microsculptured lateral surfaces and between mesocoxae, lacking mesal or apicomesal impressions or striae, basomedian area impressed and fairly coarsely punctate, punctation on prevailing surface very fine and sparse; antecoxal puncture rows present. Submesocoxal areas 0.04 mm, about as fourth of intervals to metacoxae, submesocoxal lines convex, coarsely punctate. Metanepisternum flat, hardly narrowed anteriad, inner rounded, impressed below margin of metaventrite. Tibiae straight. Abdomen with strigulate microsculpture, very finely punctate; submetacoxal areas 0.07 mm, almost half of intervals to apical margin of sternite 1, submetacoxal lines convex, coarsely punctate.

M a l e: Protarsomeres and mesotarsomeres 1 to 3 distinctly widened. Aedeagus ( Figs 182, 183 ) 0.84-0.87 mm long, strongly sclerotized. Median lobe with robust articular process and long, weakly inflexed apical process. Ventral branch of apical process gradually narrowed apically, curved and acute at tip in dorsal view, truncate in lateral view; dorsal branches asymmetrical. Parameres sinuate, overlapping and widened in apical sections in dorsal view, almost evenly broad up to level of tip of median lobe in lateral view. Internal sac with very dense, short, spine-like and scale-like structures and dorsal sclerotized plate.

E t y m o l o g y: The species epithet is a Latinized adjective and refers to the type locality, Mount Apo.

C o m p a r a t i v e n o t e s: This species possesses a unique by shape of the apical process of the median lobe, with the tip of the ventral branch bent laterally, and asymmetrical dorsal branches.

Figures

Figs 177 - 183: Aedeagi of Scaphisoma; (177), S. surigaosum (PIC), in lateral view, scale 0.2 mm; (178, 179), S. transversale nov. sp., in dorsal and lateral views, scale = 0.1 mm; (180, 181), S. acutulum nov. sp., in dorsal and lateral views, scale = 0.2 mm; (182, 183), S. apomontanum nov. sp., in dorsal and lateral views, scale = 0.2 mm.