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

description: Stenus persubtilis nov.sp. (Figs 30, 60)
Type material: Holotype () and 3 - paratypes: Taiwan: Nantou Hsien: Meifeng, 2130m, 10.VII.1993, A. Smetana (T 146). Paratypes: 2: ibidem, 3.V.1991, idem (T 82); 2, 4: ibidem, 2.V.1993, idem (T 96); 25, 13: ibidem, 4.V.1998, idem (T 199); 2, 3: Meifeng, 6.V.2000, H. Sugaya; 8, 9: ibidem, 26.X.2000, idem; 3, 1: Tsuifeng, 22.VII.1988, S. Nomura; 4, 2: near Tsuifeng, 2200m, 28.VII.1973, Shibata; 3, 2: ibidem, 23.VIII.1973, idem; 1: ibidem, 27.VII.1974, idem; 1: Nanshanchi, 850m, 24.VIII.1973, Shibata. - HT and PTT in coll. Smetana (Ottawa), PTT also in cN, cSh, cT and in cP.
Description: Apterous, slightly shiny, dark brown to blackish, forebody coarsely and very densely punctate, slightly coalescent on pronotum, abdominal punctation moderately coarse and dense anteriorly, moderately fine and dense posteriorly. Maxillary palpi yellowish. Base of antennae yellowish brown, club infuscate. Legs yellowish brown.
Length: 2.6-3.1mm (forebody: 1.3-1.4mm).
PM of the HT: HW: 27.5; DE: 14; PW: 20; PL: 20.5; EW: 25; EL: 21; SL: 15.5.
Male: Metasternum shallowly impressed, coarsely and densely punctate, interstices smaller than half diameter of punctures. Anterior sternites simple, sternite 7 very finely and very densely punctate and pubescent posteromedially. Sternite 8 with a shallow, moderately broad apical emargination (LS: ED about 45:3). Sternite 9 with long, light colored apicolateral teeth. Aedeagus (fig. 30), apical portion of median lobe very short, broadly rounded, expulsion hooks separated; parameres much longer than median lobe, with about 11 apical setae.
Female: Sternite 8 obtusely angled triangular at posterior margin, apex narrowly rounded. Valvifer with a long apicolateral tooth. Spermatheca (fig. 60), infundibulum at least 3x as long as broad.
Head distinctly broader than elytra, frons with two broad longitudinal furrows, median portion about as broad as each of the lateral portions, distinctly elevated, exceeding the level of medial eye margins; punctation coarse and very dense, diameter of punctures about as large as medial cross section of antennal segment 3, interstices distinctly smaller than half diameter of punctures, larger on actual middle of the median portion, where they can become slightly larger than diameter of punctures. Antennae short, when reflexed extending nearly to the posterior margin of the pronotum, penultimate segments about one third longer than broad. Pronotum about as broad as long, sides convex, slightly concave posteriorly; a shallow oblique impression in posterior lateral half, a short longitudinal impression medially; punctation coarser than on frons, very dense, slightly confluent, diameter of punctures as large as largest cross section of antennal segment 3 (distinctly smaller than apical cross section of antennal segment 2). Elytra trapeziform, much broader than long, impressions shallow, not conspicuous, punctation slightly coarser than on pronotum, very dense, diameter of punctures about as large as apical cross section of antennal segment 2. Abdomen ellipsoid, completely margined, paratergites oblique, those of tergite 5 as broad as base of metatibiae, moderately densely punctate; basal furrows of anterior tergites deep, tergite 7 without an apical membranous fringe; punctation on tergite 3 resembling that of frons, dense, that on tergite 7 moderately fine and moderately dense, diameter of punctures about as large as an eye facet near medial eye margin, interstices at most as large as punctures. Legs moderately slender, metatarsi slightly shorter than two thirds of the metatibiae, segment 1 slightly longer than the two following segments combined, about as long as the claw segment. Forebody densely, abdomen shallowly reticulate.
Comparative notes: This new species belongs to the S. cephalotes -group and resembles many species with distinct, oblique paratergites. From most of them it may be distinguished by the comparatively even elytra and the distinctly elevated median portion of frons, from all by the aedeagus and/or the spermatheca.
Etymology: Since it is a small species with moderately coarse punctation I name it " persubtilis " (Lat.= delicately built).
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 1441-1442, DOI: 10.5281/zenodo.5337424