Scaphisoma punctatum
Creators: name: Löbl, Ivan
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Staphylinidae
Scaphisoma
Scaphisoma punctatum

description: Scaphisoma punctatum (Pic, 1915)
Pseudoscaphosoma punctatum Pic, 1915: 31.
Type locality. Indonesia, Kalimantan, Martapura.
Type material examined. LECTOTYPE (by present designation): ♀, ‘ Martapura S.E.Borneo Doherty 1891 [printed] / Type [handwritten by Pic] / TYPE [red, printed] / Pseudoscaphosoma punctatum Pic [handwritten by Pic] / Scaphosoma probabl [handwritten by Pic] / Scaphisoma punctatum (Pic) det. Löbl 1976 / Lectotype Scaphisoma punctatum (Pic) des. Löbl 2014’ (MNHN). The lectotype has the left antenna mounted on celluloid slide, the antennomeres VII to XI of the right antenna are broken off and missing.
Additional material examined. 1 ♀, with the same locality data as the lectotype (MHNG).
Redescription. Length 1.37 mm, width 0.92 mm. Head and most of body very dark brown with somewhat reddish lustre, apical sixth of elytra, apical abdominal segments, tarsi and antennae yellowish or very light brown, femora and tibiae also lighter than most of body, but not as light as tarsi. Pronotum and elytra without microsculpture. Antennae with length/ width ratio of antennomeres as follows: III 12/5: IV 20/5: V 30/6: VI 30/7: VII 42/10: VIII 28/8: IX 41/10: X 42/10: XI 50/14. Pronotum with lateral margins rounded, lateral margin carinae not visible in dorsal view, discal punctation fine, dense, well delimited, near base distinctly coarser than on anterior half; pubescence indistinct. Apical part of scutellum exposed. Elytra with lateral margin carinae entirely exposed in dorsal view, apical margins slightly rounded, inner apical angle not prominent, situated posterior level of outer angles, sutural margin raised, sutural striae deep, not curved at base and not extended along basal margins, gradually converging apically, adsutural areas flat at sutural margin, combined 0.18 mm wide at elytral base, each with two distinct puncture rows reaching mid-length, single puncture row in apical halves. Elytral punctation conspicuous, each elytron with 5 or 6 oblique puncture rows consisting of large and well delimited punctures, mostly much larger than puncture intervals. Inner puncture rows reaching apical third of disc, latter very finely and sparsely punctate. Humeral areas very finely punctate, areas between puncture rows and lateral margins impunctate. Inner puncture rows long, starting near base, outer puncture rows short, limited onto middle third of each elytron. Punctation on surfaces between anterior parts of inner puncture rows and sutural striae distinct, similar to that on basal part of pronotum. Hypomera not microsculptured, appearing impunctate. Mesepimeres as long as two thirds of interval to mesocoxae and 3 times as long as wide. Metaventrite weakly convex mesally, with very shallow apicolateral impressions, lacking microsculpture in middle and on sides, with strigulate microsculpture between mesocoxae and metacoxae, punctation mostly very fine and sparse, several large punctures in and near apicomedian impression, antecoxal puncture rows present, not impressed. Submesocoxal lines weakly convex, distinctly punctured, submesocoxal areas 0.04 mm long, as third of interval to metacoxae. Metanepisterna flat, at inner margin impressed below level of metaventrite, 0.09 mm wide, weakly narrowed anteriad, inner suture almost straight, rounded at angles. Tibiae straight. Abdomen with strigulate microsculpture and very finely punctate. Ventrite 1 with submetaxocal areas 0.08 mm long, strongly convex, about as two thirds of interval to apical margin of ventrite.
Distribution. Indonesia (Kalimantan).
Comments. This species is absent from new collections and its male characters remain unknown. The shape of the sutural striae of the elytra suggest possible relationships with members of the S. haemorrhoidale or S. pictum groups, the conspicuous pattern of the elytral punctation suggest relationships with members of the S. rouyeri group.
description: Published as part of Löbl, Ivan, 2015, Notes on Scaphisoma of Kalimantan (Coleoptera: Staphylinidae: Scaphidiinae), pp. 129-144 in Acta Entomologica Musei Nationalis Pragae 55 (1) on pages 137-138, DOI: 10.5281/zenodo.5318986