Scaphisoma subanun, 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 : 1380-1381

5.2.7.20. Scaphisoma subanun nov.sp. ( Figs 33, 108, 109 )

T y p e m a t e r i a l: Holotype 6: Mindanao Pt. Banga / 1924 / Staatl. Museum Tierkunde Dresden (SMTD). Paratypes: Mindanao, Davao Prov., E. slope Mt. McKinley, 3300 ft., 28.VIII.1946, sweeping air at dusk, leg. F.G. Werner, 1 6 (FMNH); Mindanao, Malaybalay, Busdi, 1000 m, 5.-9.V.1996, leg. Bolm, 3♀♀ (SMNS, MHNG).

D e s c r i p t i o n: Length 1.33-1.55 mm, width 0.88-1.01 mm. Head and most of body dark brown to blackish with weak reddish shine. Elytra each lighter between middle third and apical fifth, with light area almost yellowish, forming or not forming transverse band; apical tenth to fifth of elytra as dark as, or lighter than anterior surface of elytra. Femora almost as dark as body, tibiae, tarsi and antennae yellowish. Pronotum and elytra not microsculptured and not iridescent. Length/width ratio of antennomeres as: III 10/8: IV 32/6: V 34/8: VI 35/8: VII 47/12: VIII 37/9: IX 48/13: X 49/13: XI 60/14. Pronotum sparsely, very finely punctured, punctures hardly visible at 30 times magnification, lateral contours evenly rounded, lateral margin carinae not visible in dorsal view, lateral striae finely punctate. Exposed tip of scutellum minute. Elytra with lateral margin carinae exposed in dorsal view, apical margins hardly rounded, inner apical angles not prominent, situated in or posterior level of outer angles; sutural margin raised except near scutellum, sutural striae deep, oblique and angular in anterior section, not bent at and not extended along basal margins, strongly converging toward apices, distinctly punctate; adsutural areas very wide at base, posterior level of basal sixth of sutural length half as wide as at base, then gradually narrowed, densely punctate. Lateral striae coarsely punctate. Middle of elytral disc with punctation fairly fine and dense, coarser than that on pronotum, with punctures poorly delimited, mostly smaller than intervals between them, apical part of elytra very finely punctate. Hind wings fully developed. Hypomera and mesanepisterna smooth. Mesepimera somewhat longer than intervals to mesocoxae and about four times as long as wide. Metaventrite very finely punctate, not microsculptured on lateral areas; antecoxal puncture rows absent. Median part of metaventrite convex, with two apicomedian impressions, strigulate microsculpture; submesocoxal areas 0.03 mm, about as fifth of intervals to metacoxae, submesocoxal lines hardly convex, finely punctate. Metanepisternum flat, narrow, slightly narrowed anteriad, inner margin rounded, suture shallow. Tibiae straight. Abdomen with distinct strigulate microsculpture. Sternite 1 with submetacoxal areas about 0.02 mm, about as tenth of intervals to apical margin, submetacoxal lines subparallel, with distinct marginal punctures.

M a l e: Protarsomeres 1 to 3 moderately widened. Aedeagus ( Figs 108, 109 ) 0.40 mm long, symmetrical, fairly strongly sclerotized. Apical process of median lobe shorter than basal bulb, inflexed, with ventral side concave, almost evenly thick in middle section and with acute tip in lateral view, in dorsal view with subparallel margins, narrowed apical section excepted; articular processes large, strongly prominent. Parameres gradually narrowed apically in dorsal view, almost evenly wide and weakly curved in lateral view, reaching beyond tip of median lobe. Internal sac with membranes covered by minute, hardly visible denticles.

E t y m o l o g y: The species epithet is a name of one of the Mindanao languages. C o m p a r a t i v e n o t e s: This species differs drastically from its allied by the elytra with very wide adsutural areas and angular, strongly converging sutural striae. It shares with S. binaluanum and S. lunabianum large articular processes of the median lobe of the aedeagus, and with S. binaluanum also the internal sac lacking distinct denticulate structures. The shape of the parameres as seen in lateral view is diagnostic for this new species.

Figures

Figs 108 - 114: Aedeagi of Scaphisoma; (108, 109), S. subanun nov. sp., in dorsal and lateral views; (110, 111), S. breviatum nov. sp., in dorsal and lateral views; (112, 113), S. opacum nov. sp., in dorsal and lateral views; (114), S. elpis nov. sp., in dorsal view, without contours of proximal part of basal bulb. Scale = 0.1 mm.