Stenus perfectus, 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 : 1452-1453

Stenus perfectus nov.sp. ( Figs 45 , 74 )

Type material: Holotype () and 7, 3 - paratypes: Taiwan: Nantou Hsien: Nankaoshan trail, Yuenhai Hut , 2350m, 4.V.1992, A. Smetana (T 112) . Paratypes: 2, 1: Nankaoshan, Tenchi Hut , 2800m, 6.V.1992, idem (T 13) ; 35, 36: ibidem, 2900m, 6.V.1992, idem (T 14) ; 13, 12: ibidem, 2895m, 7.V.1992, idem (T 119) ; 8, 12: 2.5 km SW Tenchi Hut , 2720m, 6, V.1992, idem (T 115).- HT and PTT in coll. Smetana (Ottawa), PTT also in cN, cT and in cP .

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

Length: 2.5-3.3 mm (forebody: 1.4-1.6mm).

PM of the HT: HW: 30; DE: 16; PW: 22; PL: 22.5; EW: 27; EL: 24; SL: 17.

Male: Metasternum shallowly impressed, coarsely and densely punctate, interstices smaller than half diameter of punctures. Anterior sternites simple, sternite 6 with a slightly finer punctation and pubescence medially, sternite 7 with finer and denser punctation and pubescence medially. Sternite 8 with a moderately shallow, moderately broad apical emargination (LS: ED= 47:3). Sternite 9 with short apicolateral teeth. Aedeagus (fig. 45), median lobe broadly subtruncate apically, expulsion hooks broad and short, separated; parameres longer than median lobe, with about 5-6 apical setae.

Female: Sternite 8 at posterior margin obtusely angled triangular, apex narrowly rounded. Valvifer with a short apicolateral tooth. Spermatheca (fig. 74) with a long and narrow infundibulum.

Median portion of frons distinctly exceeding the level of medial eye margins; pronotal and elytra impressions deep, punctation coarser than in S. persubtilis , elytral punctures becoming as large as median cross section of antennal segment 2; abdomen very densely punctate, interstices on tergite 7 distinctly smaller than half diameter of punctures.

Note: Amongst the PTT from T 114 there was found a monstrous male, which has broader, upwards bent paratergites and a very coarse, irregular elytral punctation. This may indicate that the broadness and position of the abdominal margination is a plastic character. This case also may be regarded as an example of atavism (as my friend Naomi suggests).

Comparative note: Also this new species has to be identified by examining the sexual characters.

Etymology: Because this species has a nice aedeagus I name it " perfectus " (Lat.= in good shape).

Figures

Figs 42-54: Ventral aspect of aedeagus (42-45), paraglossa (46, 47), metasternum (48), spermatheca (49-54) of Stenus perpunctus nov.sp. (42, T 69, PT), S. perscitus nov.sp. (43, T28, PT), S. pertricosus nov.sp. (44, T 61, PT), S. perfectus nov.sp. (45, T 119, PT), S. perpauperculus nov.sp. (46, 52, PTT), S. pilicornis FAUVEL (47, 48), S. mysterialis PUTHZ (49), S. perpusillus nov.sp. (50), S. perpropinquus nov.sp. (51, T 52, PT), S. perpauper nov.sp. (53,T 60, PT), S. perpastus (54, T 91, PT). – Scale bar = 0.1mm (42=43-45).

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).