Stenus perrarus, 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 : 1445

Stenus perrarus nov.sp. ( Figs 39 , 64 )

Type material: Holotype () and 3 - paratypes: Taiwan: Taoyuan Hsien: Takuanshan Forest , 1650m, 17.IV.1990, A. Smetana (T 5). Paratypes: 2, 1: Taipeh Hsien: Fushan , 27.IV.1999, H. Sugaya.- HT and PTT in coll. Smetana (Ottawa), PTT also in cN and in cP.

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

Length: 2.5-3.1mm (forebody: 1.3-1.4mm).

PM of the HT: HW: 28.8; DE: 15; PW: 21.5; PL: 23.5; EW: 27.8; EL: 23; SL: 16.

Male: Ventral characters as in S. persimplex nov.sp., but the apical emargination of sternite 8 less deep and broader (LS: ED= 51:3). Aedeagus (fig. 39), apical portion of median lobe very short, convexely narrowed, apex narrowly rounded, expulsion hooks not contiguous medially; parameres much longer than median lobe, with 9-10 apical setae.

Female: Sternite 8 at posterior margin obtusely angled triangular, apex nearly acute. Valvifer as in S. perturbator . Spermatheca (fig. 64), infundibulum at least 3x as long as broad.

In many respects very similar to S. persubtilis , but the median portion of frons less elevated, the elytral punctation slightly coarser, the abdominal punctation slightly less dense, interstices on last tergites distinctly larger than punctures.

Comparative notes: This new species resembles extremely S. persimplex nov.sp., but the head is slightly less broad, the sexual characters are different. For identification see key.

Etymology: Since I only saw few specimens I name this new species " perrarus " (Lat.= very rare).

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 55-69: Spermathecae of PTT of Stenus pervenustus nov.sp. (55, T 138), S. persculptus nov.sp. (56, T 107), S. persculpturatus nov.sp. (57, T 88), S. pervilis nov.sp. (58, T 120), S. sugayai nov.sp. (59, Anmashan), S. persubtilis nov.sp. (60, T 199), S. perplicatus nov.sp. (61, Meifeng), S. perturbator nov.sp. (62, T 187), S. persimplex nov.sp. (63, T 177), S. perrarus nov.sp. (64, Fushan), S. perspicabilis nov.sp. (65, T 144), S. perpinguis nov.sp. (66, T 29), S. perodiosus nov.sp. (67, T 84), S. perpunctus nov.sp. (68, T 72), S. perversor nov.sp. (69, T 59).