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

description: Stenus perspicabilis nov.sp. (Figs 10, 21, 65)
Type material: Holotype () and 4, 5 - paratypes: Taiwan: Kaohsiung Hsien: Kuanshan trail above Kaunshanchi River, 2550m, 21.IV.1992, A. Smetana (T 96). Paratypes: 15, 15: same as HT, 22.VII.1993, idem (T 160); 1, 2: Anmashan, 2225m, 2.V.1990, idem (T 37); 1: ibidem, 2.V.1990, idem (T 38); 2, 2: ibidem, 3.V.1990, idem (T 42); 1, 2: ibidem, 14.V.1992, idem (T 130); 1: Anmashan Creek, 2136m, 12.V.1992, idem (T 125); 10, 7: Peinantashan trail, 2080m, 8.VII.1993, idem (T 141); 2, 2: ibidem, 2020m, 7.V.1993, idem (T 143); 4, 8: ibidem, 2000m, 7.V.1993, idem (T 144); 1, 2: ibidem, 1950m, 8.VII.1993, idem (T 145); 1: Kuanshan trail above Kaunshanchi River, 2550m, 22.VII.1993, idem (T 160); 1, 1: Hsuehshan Chi-Ka, 2463m, 6.V.1991, idem (T 67); 20, 18: Tengchih, 2100m, 19.-22.IV.2003, H. Sugaya. Hualien Hsien: 1: Taroko National Park, Chungyantienshi (River) Waterfall, 2300m, 10.V.1990, A. Smetana (T 50); 2: ibidem, 2280m, idem (T 51); 1: ibidem, Nanhushi Hut, 2220m, 12.V.1990, idem (T 54); 1, 4: ibidem, idem (T 55). Ilan Hsien: 1: Taipingshan, 1820m, 15.VII.1993, idem (T 153). Taoyuan Hsien: 1, 2: Takuanshan Forest, 1600m, 17.IV.1990, idem (T 3); 4, 5: Lalashan, 2000m, 17.-18., 18. and 19.XI.2000, H. Sugaya. - HT and PTT in coll. Smetana (Ottawa), PTT also in cN, cT and in cP.
Description: About as in S. persubtilis nov.sp.
Length: 2.43.0mm (forebody: 1.4-1.5mm).
PM of the HT: HW: 28.7; DE: 14; PW: 22; PL: 22.5; EW: 27.8; EL: 23; SL: 18.
Male: Metasternum shallowly impressed, coarsely and densely punctate, interstices nearly as large as half diameter of punctures. Sternite 3 simple, sternite 4 with a broad, round median impression in posterior half, which is finely and densely punctate and pubescent, sternite 5 with a very broad and deep impression in posterior half, which is extremely finely punctate and pubescent, posterior margin very shallowly emarginate, sternite 6 principially as sternite 5, but the impression even deper, the apical emargination deeper, sternite 7 with a broad median impression becoming shallower posteriorly, punctation and pubescence same as on preceeding sternites. Sternite 8 with a narrow subtriangular emargination in about posterior sixth. Sternite 9 with comparatively long, light apicolateral teeth. Aedeagus (fig. 21), median lobe triangularly narrowed, apex rounded, expulsion hooks long, separated; parameres with its narrow apical portion distinctly exceeding the median lobe, with about 17-19 setae in apical third.
Female: Sternite 8 (fig. 10). Valvifer with a long and light apicolateral tooth. Spermatheca (fig. 65), infundibulum short and broad.
Head slightly (or not) broader than elytra, median portion of frons not or distinctly exceeding the level of medial eye margins. Pronotum and elytra with deep impressions, punctation coarser than in S. persubtilis, but punctures smaller than medial cross section of antennal segment 2. Abdominal punctation dense, interstices on tergite 7 smaller than punctures.
Comparative notes: This is a comparatively robust species, which may be identified by the relatively narrow head and the sexual characters. It is the sister species of S. hagoromo NAOMI (described from Iriomote, Ishigaki and Yonaguni Is.). Although the aedeagus of both species are similar, they are distinct by the abdominal margination: in S. hagoromo the abdominal segments 4-6 have only a narrow tergosternal suture, in S. perspicabilis there are two suture-lines which include paratergites. This is a further example of the plasticity of the character of abdominal margination in the S. cephalotes group.
Etymology: Since this species is remarkable by the strong ventral sexual characters of the male I name it " perspicabilis " (Lat.= remarkable).
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 1446-1447, DOI: 10.5281/zenodo.5337424