Scaphisoma apomontium, 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 : 1363-1364

5.2.7.1. Scaphisoma apomontium nov.sp. ( Figs 70, 71 )

T y p e m a t e r i a l: Holotype 6: Mainit Riv. Mt Apo / Mindanao IX 2430 P.I. / Coll. by C.F.Clagg / Field Mus. (F. Psota Coll.) (FMNH).

Description: Length 1.23 mm, 0.86 width mm. Head and body very dark, blackish, apical abdominal segments and appendage ochreous to yellowish. Pronotum and elytra not microsculptured and not iridescent. Length/width ratio of antennomeres as: III 7/8: IV 15/7: V 22/8: VI 50/9: VII 52/12: VIII 43/9: IX 49/10: X 45/12: XI 48/14. Pronotum very finely and densely punctate, with lateral contours evenly rounded, lateral margin carinae not visible in dorsal view, lateral striae punctate. Exposed tip of scutellum minute. Elytra with lateral margin visible in dorsal view, apical margins weakly rounded, inner apical angles not prominent, situated about in level with outer angles; sutural margin not raised, sutural striae deep, slightly bent at base, not extending along basal margin, parallel between level of scutellar tip and mid-length, somewhat converging toward apices; adsutural areas flat, densely and finely punctate; lateral striae punctate. Elytral disc with punctation fairly fine and dense, punctures well delimited, puncture intervals mostly about three times as large as puncture diameters. Hind wings fully developed. Hypomera and mesanepisterna smooth. Mesepimera about as halves of intervals to mesocoxae, about twice as long as wide. Metaventrite very finely punctate; median part convex, without impressions or stria, with strigulate microsculpture; lateral parts not microsculptured; antecoxal puncture rows absent. Submesocoxal areas 0.02 mm, about as seventh of intervals to metacoxae, submesocoxal lines parallel, distinctly punctate. Metanepisternum flat, not narrowed anteriad, inner margin straight, suture deep. Tibiae straight. Abdomen with strigulate microsculpture, very finely and sparsely punctate; submetacoxal areas 0.05 mm, about as half intervals to apical margin of sternite 1, submetacoxal lines convex, fairly coarsely punctate.

M a l e: Protarsomeres 1 to 3 distinctly widened. Aedeagus ( Figs 70, 71 ) 0.32 mm long, symmetrical, fairly sclerotized. Articular processes large, prominent. Apical process of median lobe fairly long, inflexed, tapering, with acute tip. Parameres in lateral view oblique, almost evenly wide posterior bases, in dorsal view narrowed posterior mid-length, weakly curved and evenly narrow in apical third. Internal sac tubular, lacking sclerites, without flagellum.

E t y m o l o g y: The species epithet is an adjective derived from the type locality, Mount Apo.

Co mpara tive note s: The aedeagus of S. apomontium is similar to that of S. hexamerum described below, and both share also conspicuously elongate antennomeres VI. These two species may be readily distinguished by the body-colour, blackish in S. apomontium, light brown in S. heramerum. Scaphisoma bolmarum possesses an aedeagus quite similar but differs in external characters, in particular by the uneven elytral punctation, the length ratio of the antennomeres, and the metaventrite lacking microsculpture.

Figures

Figs 70 - 75: Aedeagi of Scaphisoma in dorsal and lateral views; (70, 71), S. apomontium nov. sp.; (72, 73) S. binaluanum PIC; (74, 75), S. bolmarum nov. sp. Scale = 0.1 mm.