Stenus perpusillus Puthz 2012, nov.sp.
Creators: name: Puthz, V.
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Staphylinidae
Stenus
Stenus perpusillus

description: Stenus perpusillus nov.sp. (Figs 17, 50)
Type material: Holotypus () and 1, 2 - paratypes: TAIWAN: Ilan Hsien: Taipingshan 1950m, 13.VII.1993, A. Smetana (T 150): HT and PTT in coll. Smetana (Ottawa), 1 PT in cP.
Description: Micropterous, slightly shiny, foreparts coarsely and very densely punctate, abdomen moderately coarsely to finely, densely punctate. Maxillary palpi yellowish. Antennae and legs reddish yellow.
Length: 2.5-2.7mm (forebody: 1.2mm).
PM of the HT: HW: 26.3; DE: 14; PW: 19.5; PL: 19; EW: 23.3; EL: 20; SL: 14.5.
Male: Metasternum shallowly impressed, coarsely and densely punctate. Anterior sternites simple, sternite 6 broadly shallowed medially, sternite 7 with a horseshoe like impression in posterior two thirds, which is finely and densely punctate and pubescent. Sternite 8 with a very shallow apical emargination (LS: ED= 40:2). Sternite 9 with moderately long teeth apicolaterally. Aedeagus (fig. 17), median lobe broadly rounded distally, expulsion hooks connected medially; parameres distinctly longer than median lobe, with 10 long setae in apical quarter.
Female: Sternite 8 obtuse-angled at posterior margin. Valvifer with a moderately long tooth apicolaterally. Spermatheca (fig. 50).
Head broader than elytra, frons with broad longitudinal furrows, median portion as broad as each of the lateral portions, distinctly extending beyond the level of median eye margins; punctation moderately coarse and very dense, diameter of punctures about as wide as median cross section of antennal segment 3, interstices much smaller than half diameter of punctures, larger on actual middle of median portion. Antennae short, when reflexed not extending toward the posterior margin of the pronotum, penultimate segments slightly longer than broad. Pronotum about as long as broad, sides strongly convex, distinctly concave in posterior half, an oblique lateral impression in posterior half and a distinct longitudinal impression medially; punctation coarse and very dense but only slightly confluent, diameter of punctures about as wide as apical cross section of antennal segment 2, interstices smaller than half diameter of punctures. Elytra trapeziform, distinctly broader than long, punctation yet coarser than on pronotum, very dense but only slightly confluent. Abdomen cylindrical without any lateral margination, basal furrows of anterior segments deep, no membranous fringe at posterior margin of tergite 7; punctation moderately coarse anteriorly, punctures of tergite 4 nearly as large as basal cross section of antennal segment 3, interstices slightly smaller than diameter of punctures, punctures of tergite 7 nearly as wide as one eye facet at medial exe margin, interstices nearly as wide as punctures, tergite 10 moderately finely, moderately densely punctate. Legs moderately robust, metatarsi anout two thirds as long as metatibiae, segemen1 distinctly longer than the two following segments combined, about as long as segments 4+5 combined, segment 4 narrowly bilobed. The whole insect with fine microsculpture.
Comparative notes: This new species belongs to the large group of S. cephalotes SHARP (NAOMI, in press). It resembles closely S. perpropinquus nov.sp., from which it may be distinguished by the sexual characters. In the new species the head is slightly broader, the abdominal punctation slightly finer and less dense as in the compared species.
Etymology: Since this species belongs to the very small species I name it " perpusillus " (Lat.= very small).
description: Published as part of Puthz, V., 2012, On the Stenus LATREILLE 1797 from Taiwan with non-spotted elytra (Coleoptera, Staphylinidae) (327 Contribution to the Knowledge of Steninae), pp. 1431-1475 in Linzer biologische Beiträge 44 (2) on pages 1435-1436, DOI: 10.5281/zenodo.5337424