Stenus pertenuis, Puthz, 2012

Puthz, V., 2012, On the Stenus LATREILLE 1797 from Taiwan with non-spotted elytra (Coleoptera, Staphylinidae) (327 Contribution to the Knowledge of Steninae), Linzer biologische Beiträge 44 (2), pp. 1431-1475 : 1451-1452

Stenus pertenuis nov.sp. ( Figs 41 , 75 )

Type material: Holotype () and 2, 3 - paratypes: Taiwan: Kaohsiung Hsien: Creek 2 km E Tien Chih , Hwy 20, 2400m, 22.VII.1993, A. Smetana (T 161). Paratypes: 1: Kuanshan Trail above Kaunshanchi River, 2550m, 22.VII.1993, idem (T 160).- HT and PTT in coll. Smetana (Ottawa), PTT also in cP.

Description: About as in S. persubtilis nov.sp.

Length: 2.9-3.4mm (forebody: 1.5-1.6mm).

PM of the HT: HW: 31; DE: 16; PW: 22.5; PL: 23; EW: 27; EL: 25; SL: 19.5.

Male: Metasternum distinctly impressed, coarsely and densely punctate, interstices smaller than half diameter of punctures. Anterior sternites simple, sternite 7 finely and densely punctate and pubescent medially. Sternite 8 with a shallow, moderately broad apical emargination (LS: ED= 54:3). Sternite 9 with moderately long blackish apicolateral teeth. Aedeagus (fig. 41), apical portion of median lobe very broadly rounded ventrally, with a short triangular apex dorsally, expulsion hooks separated; parameres distinctly longer than median lobe, with about 8 apical setae.

Female: Sternite 8 obtusely angled triangular at posterior margin, apex rounded. Valvifer with a comparatively short apicolateral tooth. Spermatheca (fig. 75), infundibulum at least 4x as long as broad.

Median portion of frons distinctly exceeding the level of medial eye margins; elytra very uneven with deep longitudinal impressions, punctation coarser than in S. persubtilis , largest punctures as large as medial cross section of antennal segment 2; abdominal punctation dense, interstices on tergite 7 smaller than punctures.

Comparative note: This species has to be identified best by the sexual characters; see also key.

Etymology: Because of the small body I name this species " pertenuis " (Lat.= very small).

Figures

Figs 30-41: Ventral aspect of aedeagus (30-34, 37-41) outline of apical portion of aedeagus (35, 36) of Stenus persubtilis nov.sp. (30, T 146, PT), S. pervilis nov.sp. (31, T 12, PT), S. perversor nov.sp. (32, T 59, PT), S. permodestus nov.sp. (33, T 179, PT), S. perplicatus nov.sp. (34-36: Shouchia, PTT), S. persimplex nov.sp. (37, T 177, PT), S. perodiosus nov.sp. (38, T 85, PT), S. perrarus nov.sp. (39, T 5, PT), S. permolestus nov.sp. (40, T 119, PT), S. pertenuis nov.sp. (41, T 160, PT). – Scale bar = 0.1mm.

Figs 70-77: Spermathecae of PTT (70-75), elytra (76), semilateral aspect of abdominal segments 4- 7 (77) of Stenus permolestus nov.sp. (70, T 116), S. pertricosus nov.sp. (71, T 61), S. permodestus nov.sp. (72, T 64), S. perscitus nov.sp. (73, T 28), S. perfectus nov.sp. (74, T 19), S. pertenuis nov.sp. (75, T 161), S. nefas PUTHZ (76, 77, HT).