Scaphisoma nabiluanum, 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 : 1377-1378

5.2.7.16. Scaphisoma nabiluanum nov.sp. ( Fig. 23, 101, 102 )

T y p e m a t e r i a l: Holotype 6: Philippines Mt. Polis, 1900m Ifugao Prov., Luzon / June, 5, 1977 Y. Kurosawa leg. (NMNS). Paratypes: Luzon, with the same data as the holotype, 8 66, 3♀♀ (NMNS, MHNG, BZLA); Luzon, Mountain Prov., Mt. Puguis, 1900-2000 m, 18.VII.1985, leg. M. Sakai, 1 6 (EUMJ); with same data but 1950 m, 16.VII.1985, 1 6 (MHNG); same data but 1800-1900 m, 17.VII.1985, leg. M. Sakai, 3 66 (EUMJ, MHNG).

D e s c r i p t i o n: Length 1.40-1.60 mm, width 1.0-1.11 mm. Head and most of body blackish-brown to black, each elytron with yellowish or ochreous transverse subapical band usually well delimited and about as wide as or wider than dark apical area, latter usually somewhat lighter than most of elytral surfaces. Subapical bands not or hardly oblique, with well delimited, irregular anterior and posterior margins. Apical abdominal segments, femora and tibiae ochreous, much lighter than most of body, tarsi and antennae ochreous or yellowish. Pronotum and elytra not microsculptured and not iridescent. Length/width ratio of antennomeres as: III 13/6: IV 19/6: V 30/7: VI 43/10: VII 44/15: VIII 37/11: IX 44/13: X 45/13: XI 55/16. Pronotum very finely and densely punctate, punctures hardly visible at 30 times magnification, lateral contours evenly rounded, lateral margin carinae not visible in dorsal view, lateral striae very finely punctate. Exposed tip of scutellum minute. Elytra with lateral margin carinae not or hardly visible in dorsal view, apical margins slightly rounded to truncate, inner apical angles not prominent, situated posterior level of outer angles; sutural margin slightly raised posterior basal third, sutural striae fairly deep, shortly bent at base, not extending along basal margins, almost parallel from level of tip of scutellum toward apical half, converging toward apices, impunctate; adsutural areas narrow, finely punctate. Lateral striae impunctate. Discal punctation usually similar to pronotal punctation, very fine, dense, in some specimens distinctly coarser than on pronotum. Hind wings well developed. Hypomera smooth. Mesepimera about as long as intervals to mesocoxae and about three times as long as wide. Metaventrite very finely punctate, with strigulate microsculpture limited onto apicomedian area. Median part of metaventrite somewhat convex, with two distinct apicomedian impressions; antecoxal puncture rows absent. Submesocoxal areas 0.03 mm, about as sixth of intervals to apical margin. Metanepisterna flat, wide, not or barely narrowed anteriad, inner margins almost straight, sutures deep. Tibiae straight. Abdomen with distinct strigulate microsculpture and very finely punctate. Sternite 1 with submetacoxal areas about 0.04-0.05 mm, about as third of intervals to apical margin, submetacoxal lines convex, with distinct marginal punctures.

M a l e: Protarsomeres 1 to 3 moderately widened. Aedeagus ( Figs 101, 102 ) 0.49-0.62 mm long, symmetrical, fairly strongly sclerotized. Apical processes of median lobe shorter than basal bulb, inflexed, almost evenly thick, with ventral side sinuate and blunt tip in lateral view, in dorsal view narrowed posterior basal bulb, widest in apical half, with apical margin broadly rounded; articular processes comparatively small, hardly prominent. Parameres narrowed from bases to apical third and evenly wide in apical third in dorsal view, almost evenly wide and straight with curved apical section in lateral view, reaching beyond tip of median lobe. Internal sac without rods or flagellum, with weakly sclerotized, minute denticles.

E t y m o l o g y: The species epithet is an anagram of the name binaluanum.

Comparative notes: This species is very similar to S. binaluanum and S. lunabianum. It may be reliably distinguished from them by the shape of the median lobe, and from S. lunabianum also by the internal sac bearing only very fine, minute denticular structures.

Figures

Figs 101 - 107: Aedeagi of Scaphisoma in dorsal and lateral views; (101, 102), S. nabiluanum nov. sp., scale = 0.1 mm; (103, 104), S. obscurum nov. sp., scale = 0.1 mm; (105, 106), S. sagax nov. sp., scale 0.1 mm; (107), ditto, internal sac, scale = 0.05 mm.