Scaphisoma compactum, 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 : 1367

5.2.7.5. Scaphisoma compactum nov.sp. ( Figs 78, 79 )

T y p e m a t e r i a l: Holotype 6: Palawan: Roxas Region of Matalangao, 80m, 1983, leg. S. Nagai & C. Lienhard, 83/86 (MHNG). Paratype: with the same data as the holotype, 1 6 (MHNG). D e s c r i p t i o n: Length 1.28-1.32 mm, width 0.90-0.93 mm. Head and most of body blackish-brown to black, elytra lighter along apical margins, sternites 1 and 2 brown, followings sternites light reddish-brown, femora reddish-brown, darker than apical abdominal segments, tibiae, tarsi and antennae lighter, almost yellowish. Pronotum and elytra not microsculptured and not iridescent. Length/width ratio of antennomeres as: III 12/7: IV 27/5: V 37/5: VI 30/6: VII 44/11: VIII 37/10: IX 44/12: X 42/12: XI 47/12. Pronotum very finely and densely punctate, punctures 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 not exposed in dorsal view, apical margins rounded, inner apical angles not prominent, situated in level with outer angles; sutural margin raised, sutural striae deep, hardly bent at base, not extending along basal margins, weakly converging from level of tip of scutellum toward apices, finely punctate; adsutural areas narrow, finely punctate. Lateral striae appearing comparatively coarsely punctate. Elytral disc with punctation very fine and dense, on prevailing surface about as fine as than that on pronotum, consisting of not well delimited punctures, punctation distinctly coarser and denser on inner halves of anterior third of elytral disc. Hind wings fully developed. Hypomera and mesanepisterna smooth. Mesepimera slightly shorter than intervals to mesocoxae and about 2.5 times as long as wide. Metaventrite very finely punctate, lacking microsculpture. Median part of metaventrite flattened, with two apicomedian impressions; antecoxal puncture rows absent. Submesocoxal areas 0.03 mm, about as third of intervals to metacoxae, submesocoxal lines parallel, coarsely punctate. Metanepisternum flat, not narrowed anteriad, inner margin straight, suture deep. Tibiae straight. Abdomen with distinct strigulate microsculpture and very finely punctate. Sternite 1 with submetacoxal areas about 0.02 mm, about as eighth of intervals to apical margin, submetacoxal lines parallel, with coarse marginal punctures.

M a l e: Protarsomeres 1 to 3 slightly widened. Aedeagus ( Figs 78, 79 ) 0.44-0.47 mm long, symmetrical, fairly strongly sclerotized. Median lobe with prominent articular processes, apical process inflexed, gradually narrowed apically, with blunt tip. Parameres straight, oblique in lateral view, throughout evenly wide. Internal sac with very dense, compact spines forming large bulbous structure and very fine, narrow apical tube.

E t y m o l o g y: The species is a Latin adjective meaning compact and referring to the compact spine-like structures of the internal sac.

C o m p a r a t i v e n o t e s: The median lobe and the parameres of the aedeagus of this species are similar to those in S. apomontium and S. sagax. The new species may be distinguished from its allied by the very compact spine-like structures of the internal sac. It differs drastically from these two species by the narrow submetacoxal areas and from S. sagax by the coarsely punctate submetaxocal lines.

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.