Stenomastigus kosianus, Jałoszyński, Paweł, 2012

Jałoszyński, Paweł, 2012, Stenomastigus Leleup (Staphylinidae, Scydmaeninae): status of subgenus Acanthostigus Leleup and revision of species with elongated male protrochanters, Zootaxa 3153, pp. 39-56 : 46-49

Stenomastigus kosianus sp. n.

( Figs. 13 , 27, 28, 18, 39–42, 23, 24, 63, 68)

Type material. Holotype: 3: "S.Afr.;KwaZulu-Natal / Kosi Bay mouth / 26.58 S – 32.50 E " [white, printed], " 13.11.2002;E-Y:3531 / general collecting / Burger,Harrison,Müller" [white, printed], " STENOMASTIGUS / kosianus m. / HOLOTYPUS " [red, printed] ( TMSA).

Paratypes: 2 ƤƤ: same data as for holotype and additional label " STENOMASTIGUS / kosianus m. / PARATY- PUS" [yellow, printed] ( TMSA).

Diagnosis. Male: head and pronotum dark brown, elytra slightly lighter; protrochanters with projecting distal margin forming slender rod, the projection as long as remaining part of trochanter; profemora in lateral view with deep ventral subapical emargination and minimally bent dorsal margin; aedeagus in abparameral view with strong constriction between basal capsule of median lobe and base of copulatory piece, in left lateral view long paramere with broad proximal part rapidly narrowing towards apex, slightly bent in two places and with rounded, fin-like parameral tooth weakly standing out from the silhouette of paramere. Female: body pigmented as in male; elytra with large but relatively shallow sub-basal impression separated from pronotal base by narrow basal ridge.

Description. Body of male ( Fig. 23 ) long and slender, with extremely long appendages, BL 3.33 mm; coloration moderately dark brown, with head and pronotum slightly darker than remaining body parts; vestiture silverish.

Head broadest at eyes, HL 0.58 mm, HW 0.60 mm; occipital constriction distinctly broader than 0.5x HW; vertex more than twice as broad as long, distinctly concave in middle, with posterior margin bearing broad subtriangular median emargination extended anteriorly by median longitudinal groove reaching to frons, lateral parts of vertex convex; frons much longer than broad, impressed between convex supraantennal tubercles, its anterior part located between antennal insertions convex and slightly broader than supraantennal tubercle; vertex and frons uniformly covered with very fine but very dense punctures adjacent to one another and extremely short but dense vestiture composed of recumbent setae; clypeus nearly four times as broad as long, with slightly concave anterior margin and glossy surface with only traces of microsculpture and transverse row of several very long, thick and erect macrosetae directed anteriorly; labrum 2.5x as broad as long, with shallow median emargination and glossy surface bearing row of several very long and thick macrosetae directed anteriorly and curved ventrally. Eyes large and coarsely faceted, each in lateral view oval and elongate, as long as temple. Antennae very slender, distinctly longer than body, AeL 3.76 mm, lengths of antennomeres (from I to XI): 0.70 mm, 0.38 mm, 0.33 mm, 0.31 mm, 0.31 mm, 0.30 mm, 0.35 mm, 0.30 mm, 0.28 mm, 0.24 mm, 0.28 mm; scapus and pedicel strongly thickened, all flagellomeres very thin and hardly noticeably thickening towards antennal apex; scapus about 6x as long as broad, slightly broadening between middle and distal third, with two longitudinal ventral setal rows each composed of 6 very long, thick and strongly erect bristles and with surface covered uniformly with moderately sparse, short suberect setae; pedicel 5x as long as broad, with two longitudinal ventral setal rows each composed of 3 long bristles, and additional single ventral apical bristle, surface of pedicel covered with moderately sparse, short suberect setae; all flagellomeres strongly elongate, much narrower than pedicel and slightly lighter in colour, each covered with short and nearly recumbent setae denser than those on scapus and pedicel, without bristles.

Pronotum pear-shaped in dorsal view, strongly elongate and broadest between middle and anterior third, PL 0.95 mm, PW 0.68 mm; anterior margin nearly straight; lateral margins strongly rounded in anterior half, broadly constricted just posterior to middle and weakly rounded in posterior fourth; posterior margin strongly arcuate; pronotal disc with indistinctly marked median longitudinal carina and pair of shallow oval impressions near middle, separated by distance much longer than width of impression. Surface covered with microsculpture composed of very dense microgranules and with matt appearance; vestiture very short, dense, recumbent.

Elytra oval and more convex than pronotum, broadest distinctly anterior to middle, EL 1.80 mm, EW 1.25 mm, EI 1.44; sub-basal part of each elytron barely noticeably impressed, so that narrow basal part appears minimally raised; posterior adsutural angle of each elytron blunt, elytra with barely noticeable shallow and diffused striae visible only near suture; surface covered with microsculpture similar to that on pronotum, but microgranules are slightly larger and flatter; vestiture extremely short, dense and recumbent.

Legs very long and slender; protrochanters modified as in Fig. 18 ; profemora as in Fig. 18 .

Aedeagus (Figs. 27, 28, 39–42) very slender, AeL 1.48 mm, in abparameral view with narrow "stalk" between basal capsule and base of copulatory piece, short paramere obliterated, long paramere in lateral views slightly bent near middle and in subapical region; parameral tooth fin-like, in both lateral views weakly standing out from the silhouette of paramere. Apex of copulatory piece as in Figs. 63 , 68 .

FIGURES 25–34. Aedeagus in abparameral (25, 27, 29, 31, 33) and left lateral (26, 28, 30, 32, 34) views. 25–26, Stenomastigus berlinafricanus sp. n. 27–28, S. kosianus sp. n. 29–30, S. allaeri Leleup. 31–32, S. basilewskyi Leleup. 33–34, S. kochi Leleup. Abbreviations: c, constriction; cp, copulatory piece; lp, long paramere; m, median lobe; pt, parameral tooth. Scale bars: 0.5 mm.

Female ( Fig. 24 ). Similar to male in body pigmentation, microsculpture and vestiture, differs clearly in larger length, different proportions of body parts and, most strikingly, in shape of elytra. BL 3.65–4.15 mm, HL 0.67–0.68 mm, HW 0.60–0.73 mm, AnL 4.04 mm, lengths of antennomeres (from I to XI): 0.83 mm, 0.45 mm, 0.35 mm, 0.31 mm, 0.33 mm, 0.30 mm, 0.35 mm, 0.30 mm, 0.28 mm, 0.27 mm, 0.27 mm; PL 0.93–1.05 mm, PW 0.70–0.83 mm. Elytra very broad, broadest between middle and anterior third, EL 2.13–2.43 mm, EW 1.48–1.70 mm, EI 1.43–1.44; in dorsal view each elytron bears very deep and elongate sub-basal impression delimited anteriorly by narrow transverse basal ridge, posteriorly and laterally the impression gradually becoming shallower and nearly confluent with surrounding areas; additionally, adsutural parts of the impression deepened and forming indistinct longitudinal grooves. Apex of each elytron forming blunt and obtuse angle, best visible in lateral view; in dorsal view apices of elytra broadly separated from each other and space between them forms subtriangular notch. In lateral view the highest point of elytra located in anterior third, basal ridges and sub-basal impression clearly visible.

Distribution. Republic of South Africa, Natal.

Etymology. Locotypical, after Kosi Bay, near where the type series was collected.

Remarks. See remarks for S. berlinafricanus .

Figures

FIGURES 9 – 16. Protrochanter of male in lateral view. 9, Stenomastigus franzi Leleup. 10, S. jeanneli Leleup. 11, S. longicornis (Boheman). 12, S. berlinafricanus sp. n. 13, S. kosianus sp. n. 14, S. allaeri Leleup. 15, S. basilewskyi Leleup. 16, S. kochi Leleup. Scale bars: 0.1 mm.

FIGURES 23 – 24. Dorsal habitus of male (23) and female (24) Stenomastigus kosianus sp. n. Scale bars: 1 mm.

FIGURES 17 – 21. Left protibia of male in lateral (17 – 19, 21) and dorsal (20) views. 17, Stenomastigus berlinafricanus sp. n. 18, S. kosianus sp. n. 19, S. allaeri Leleup. 20, S. basilewskyi Leleup. 21, S. kochi Leleup. Scale bars: 0.2 mm.

FIGURES 62 – 66. Apical part of copulatory piece in abparameral view. 62, Stenomastigus berlinafricanus sp. n. 63, S. kosianus sp. n. 64, S. allaeri Leleup. 65, S. basilewskyi Leleup. 66, S. kochi Leleup. Abbreviations: f, flagellum; dst, distal subapical tooth; pst, proximal subapical tooth. Scale bars: 0.05 mm.

FIGURES 67 – 71. Apical part of copulatory piece in left lateral view. 67, Stenomastigus berlinafricanus sp. n. 68, S. kosianus sp. n. 69, S. allaeri Leleup. 70, S. basilewskyi Leleup. 71, S. kochi Leleup. Abbreviations: f, flagellum; dst, distal subapical tooth; pst, proximal subapical tooth. Scale bars: 0.05 mm.