Scopaeus bipectenatus Frisch 2022, spec. nov.
Creators: name: Frisch, Johannes
name: Narakusumo, Raden Pramesa
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Staphylinidae
Scopaeus
Scopaeus bipectenatus

description: Scopaeus bipectenatus Frisch, spec. nov.
(Figs 21, 46, 110 –112, 140, 141, 175)
Type specimens: Indonesia: Holotype ♂, Sulawesi Tengah, Poso: S Taipa (Lake Poso), (01°55’03’’S, 120°31’18’’E), 570 m, 13.5.2017, leg. Frisch (MZB). Paratypes: 10 ♂, 4♀, same data as holotype (MFNB, MZB).
Description: Habitus and coloring as in Fig. 21. Head trapezoidal with notably concave posterior margin. Penultimate antennal segment slightly transverse. Mesotibia moderately thickened. Forebody matt with relatively coarse, dense, setose punctation; abdomen more finely punctate, thus somewhat shiny; microreticulation absent. Pubescence of body surface short, decumbent, without conspicuous macrosetae. Pronotum broad with pronounced, obtuse, lateroanterior angles. Body unicolorous black-brown except for light brown tip of abdomen, light brown antennae, light brown maxillary palpi with darkened penultimate segment, and light brown legs with dark brown femora. Total body length 2.9 – 3.2 mm; forebody length 1.6 mm.
Male: Abdominal sternite VII with posterior margin with two short, lateral emarginations and deeper, median, almost semicircular emargination occupying about posterior eighth of sternite length; sternite VII with mediolongitudinal depression delimited laterally by two convexities with irregular rows of macrosetae continued in short lobes projecting from posterior sternite margin studded with transverse row of six or seven short, close, spine-like macrosetae (Fig. 140). Posterior third of abdominal sternite VIII with deep, triangular emargination with narrowed anterior end (Fig. 141). Aedeagus (Figs 46, 110 – 112) about 0.6 mm long, strongly sclerotized, thus dark reddish brown; phallobase small compared to distal lobes, with dorsodistal window (Fig. 46, 110, 112); apical lobes in distal portion slightly curved ventrad towards wide, convex apices (Figs 46, 110), in ventral view with weakly convex lateral margins narrowed towards slender, subacute ends (Fig. 111), in dorsal view V-shaped distomedially (Fig. 112); proximal portion of apical lobes with large, ventral, elongate, distad pointing lobe (Fig. 110) and inner ventral margins forming concave ventroproximal and ventrodistal, circular windows (Fig. 111: arrows III, IV); dorsal lobe in lateral view wide, evenly tapered towards truncate apex and projecting from apical lobes both dorsally and ventrally (Fig. 110: arrows I, II), in ventral and dorsal view triangular proximally with convexly widened ends (Figs 111, 112); flagellum short, not projecting from aedeagus ventrally (Fig. 111); lateral lobes absent (Figs 111, 112); transverse ridge of median foramen shaped like upside down V (Fig. 111), separating median foramen and short, bipartite, ventral window (Fig. 111: arrow V) of phallobase.
Female: Chamber segment of sperm pump without apophysis, strongly curved towards long spiral duct (Fig. 175); bursa membranous.
Distribution: Scopaeus bipectenatus is hitherto known only from the type locality at Lake Poso, Sulawesi Tengah.
Etymology: The epithet bipectenatus was selected [adjective, Latin, composed of the numeralium bi (two) and the adjective pectenatus (pectenate, wearing combs)] with regard to the two rows of spine-like macrosetae delimiting the median emargination of the posterior margin of abdominal sternite VII (Fig. 140), which are reminiscent of combs.
description: Published as part of Frisch, Johannes & Narakusumo, Raden Pramesa, 2022, Revision of Scopaeus Erichson, 1839 (Coleoptera, Staphylinidae, Paederinae) of Indonesia, with description of 19 new species, pp. 23-73 in Soil Organisms 95 (1) on pages 56-58, DOI: 10.25674/so95iss1id311, http://zenodo.org/record/10724236