Scopaeus bipectenatus Frisch, 2022

Frisch, Johannes & Narakusumo, Raden Pramesa, 2022, Revision of Scopaeus Erichson, 1839 (Coleoptera, Staphylinidae, Paederinae) of Indonesia, with description of 19 new species, Soil Organisms 95 (1), pp. 23-73 : 56-58

publication ID	https://doi.org/ 10.25674/so95iss1id311
DOI	https://doi.org/10.5281/zenodo.10724325
persistent identifier	https://treatment.plazi.org/id/03B7C77A-FFE1-FFD7-BF14-FA960CB1063C
treatment provided by	Felipe
scientific name	Scopaeus bipectenatus Frisch
status	sp. nov.

Treatment

Scopaeus bipectenatus Frisch , spec. nov.

( Figs 21 View Figures 17–22 , 46 View Figures 42–49 , 110 –112 View Figures 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) GoogleMaps . Paratypes: 10 ♂, 4♀, same data as holotype ( MFNB, MZB) GoogleMaps .

Description: Habitus and coloring as in Fig. 21 View Figures 17–22 . 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 View Figures 42–49 , 110 – 112 View Figures 110–112 ) about 0.6 mm long, strongly sclerotized, thus dark reddish brown; phallobase small compared to distal lobes, with dorsodistal window ( Fig. 46 View Figures 42–49 , 110, 112 View Figures 110–112 ); apical lobes in distal portion slightly curved ventrad towards wide, convex apices ( Figs 46 View Figures 42–49 , 110 View Figures 110–112 ), in ventral view with weakly convex lateral margins narrowed towards slender, subacute ends ( Fig. 111 View Figures 110–112 ), in dorsal view V-shaped distomedially ( Fig. 112 View Figures 110–112 ); proximal portion of apical lobes with large, ventral, elongate, distad pointing lobe ( Fig. 110 View Figures 110–112 ) and inner ventral margins forming concave ventroproximal and ventrodistal, circular windows ( Fig. 111 View Figures 110–112 : 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 View Figures 110–112 : arrows I, II), in ventral and dorsal view triangular proximally with convexly widened ends ( Figs 111, 112 View Figures 110–112 ); flagellum short, not projecting from aedeagus ventrally ( Fig. 111 View Figures 110–112 ); lateral lobes absent ( Figs 111, 112 View Figures 110–112 ); transverse ridge of median foramen shaped like upside down V ( Fig. 111 View Figures 110–112 ), separating median foramen and short, bipartite, ventral window ( Fig. 111 View Figures 110–112 : arrow V) of phallobase.

Female: Chamber segment of sperm pump without apophysis, strongly curved towards long spiral duct ( Fig. 175 View Figures 173–178 ); 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.