Stenaptinus montanus, Fedorenko, 2020

Fedorenko, D. N., 2020, Stenaptinus (Coleoptera: Carabidae: Brachininae) of Vietnam. Note 1, Russian Entomological Journal 29 (4), pp. 361-376 : 363-368

KEY TO SPECIES GROUPS OF STENAPTINUS AND SPECIES OF THE

BIDOUPENSIS-GROUP AND THE DISSOLUTUS-GROUP OF VIETNAM:

1(20) Apterous species. Pronotum and elytra uniform brown to black.Elytra without humeri and thence much wider apically than basally, with common apical truncation in form of obtuse re-entrant angle, apical edge glabrous, ridges narrow, sharplycarinatetoveryweak.Dorsumoftendistinctlypilose. Prosternum entirely pilose.

2(9) Elytral ridges 7 and 8 (counting sutural one) conspicuous, sharply carinate toward bases, ridge 6 entire. Propleura glabrous. Body dorsum mostly slightly paler, brown to dark brown, and largely glabrous. Head bicoloured, pale in front of mid-eye level. In female, tergite VII and sternite VIII with a row of strong and straight apical setae, 6–8 ones on each side of the latter ( Figs 6, 9, 12 , 46 ). Internal sac of aedeagus simple and symmetric, without distal basal bulb ( Figs 62–63 ) ................................................... The bidoupensis -group.

3(4) Head with neck smooth to indistinctly rugulose. Female gonocoxites IX long, with apex slightly triangular and blunt ...................................... S. bidoupensis Fedorenko, 2013

4(3) Neck coarsely rugose. Female gonocoxites IX short and apically rounded.

5(6) Pronotum barely shorter (PW/PL~1.02), broadest about a fourth from apex (PLw/PL~0.26), with sides parallel in front of nearly right basal angles, and thence distinctly wider at the widest point than at base, apex barely wider than base (PB/ PA~0.96); EL/EW~ 1.28 S . ngoclinhensis ( Fedorenko, 2013)

6(5) Pronotum barely longer (PW/PL~0.93/0.99), broadest a little less than a third from apex (PLw/PL~0.29/0.30), with sides slightly diverging toward slightly acute basal angles, apex about as wide as base (PB/PA 1.0–1.04).

7(8) Elytra shorter and wider (EL/EW~1.17, EW/PW~2.05). Genae indistinct. Extreme pronotal apex finely and densely strigose. Tergite VIII rather sparsely punctate and shiny due to rather superficial isodiametric microsculpture. Antennae barely shorter, antennomere 4 short (A4L/A3L 0.71–0.73) ............................................................ S. montanus sp.n.

8(7) Elytra slightly longer and narrower (EL/EW 1.40, EW/PW 1.92). Genae distinct (GL/OL 0.26). Extreme pronotal apex smooth.Tergite VIII rather densely punctate and fairly dull due to coarse microsculpture.Antennae barely longer, antennomere 4 a bit longer (A4L/A3L 0.87) .... S. similis ( Fedorenko, 2013)

9(2) Elytral ridges 7 and 8 rather weak, very weak to obliterate basally, ridge 6 often vague or obliterate in basal 1/3–1/5. Propleura at least sparsely pilose in apical half. Body dorsum darker, mostly brown to black and often also distinctly pilose. Head anteriorly pale or infuscated. In female, tergite VII and sternite VIII with apical setae strong and incurved, about a dozen on each side of the latter ( Figs 1–2, 4–5, 7–8, 10–11 , 49 ). Internal sac of aedeagus asymmetric, with double proximal basal bulb and a distinct distal basal bulb on left side ( Figs 54–61, 64–65, 68–69 ) ..................... The dissolutus -group.

10(17) Pronotal notopleura in dorsal view glabrous in at least basal half;if 1–3 short setae traceable, then elytral ridges very fine throughout and vague basally. Notopleura mostly imperceptible in front of basal angles in dorsal view. Gonocoxite IX short and slightly curved in female.

11(12) Pronotum and notopleura in dorsal view impunctate and glabrous, body dorsum otherwise subglabrous, with few setigerous punctures behind eyes; elytral disc with a few short setae here and there and sparse microscopic pilosity. Body slender. Aedeagus apex tapered, in dorsal view triangular and short, with sides nearly straight; internal sac with distal basal bulb large and long ( Figs 57, 61 ) ......... S. glabricollis sp.n.

12(11) Pronotum distinctly pilose and punctate at least laterally and apically.

13(16) Pronotum rather sparsely pilose, notopleura in basal half, disc and often also middle of base glabrous. Elytra subglabrous, with ridge 6 mostly obliterate basally. Neck distinctly rugose.

14(15) Body robust, EL/EW 1.12–1.29 (1.21), PW/PL 0.93– 0.98 (0.96). Pronotum broadest a third from apex. Elytral ridges rather wide, ridge 6 obliterate at or widely interrupted just behind base. Aedeagus with a very distinctive apex ( Fig. 58 ) .................................. S. obliteratus Fedorenko, 2013

15(14) Body slender, EL/EW 1.18–1.39 (1.30), PW/PL 0.82– 0.92 (0.87). Pronotum broadest a fourth from apex. Elytral ridges very fine to subcostate toward base, ridge 6 mostly obliterate basally. Aedeagus apex in lateral view slightly tapered, with tip blunt; in lateral view subtriangular, with left margin straight, right margin convex, and tip wide and sidelong ( Figs 55–56 ) ...... S. dissolutus ( Andrewes, 1923)

16(13) Pronotum, including disc, rather densely pilose, notopleura in basal half glabrous, more seldom with several short setae. Elytra distinctly pilose, ridges very fine all along to obliterate just basally, ridge 6 mostly entire. Genae rather short and very smoothly extended into neck. Neck often finely rugose. Aedeagus apex in lateral view tapered, in dorsal view very long, triangular, with right margin straight, left margin convex and tip narrow; internal sac with distal basal bulb very large, as large as aedeagus apex in dorsal view, and body very convex dorsobasally and barely separat- ed from proximal basal bulbs in lateral view ( Figs 65, 69 ) .............................. S. tamdaoensis (Kischenhofer, 2010)

17(10) Pronotal notopleura in dorsal view distinctly pilose in basal half.

18(19) Pronotal notopleura rather sparsely pilose, more so medially. Pilosity otherwise distinct on pronotum, including disc,

sparser on elytra. Elytral ridges 1–5 well-developed, widened and shiny basally, ridge 6 shortened anteriorly. Head black or not contrastingly pale anterior to mid-eye level, pilose along sides only.Notopleura mostly somewhat incrassate and well visible in dorsal view.Genae fairly convex and long in posterodorsal view,extended into neck at very obtuse yet distinct angle. Aedeagus apex long triangular, tapered closer to tip; internal sac with basal bulbs small, proximal basal bulbs in dorsal view concealed with body of sac, in lateral view meeting it at acute angle ( Figs 64, 68 ). Gonocoxite IX long, slender, subclavate, strongly curved in female ( Fig. 38 ) .................. S. guanxiensis (Kischenhofer, 2010)

19(18) Entire body, including notopleura, densely or very densely pilose. Head rather contrastingly coloured, pale anterior to mid-eye level, black or dark brown behind. Notopleura invisible in dorsal view.Elytral ridges entire,very fine all along and a little shiny. Genae short. Aedeagus with internal sac similar to that of S. tamdaoensis . Gonocoxite IX slightly wider apically than basally and moderately curved in female ( Fig. 31 ). — Southern China......... [ S. beckeri (Jedlička, 1930) ]

20(1) Generally macropterous species. Body dorsum variegated and glabrous or almost so. Elytra maculate, nearly parallelsided or slightly dilated apicad, with humeri distinct, apices truncate, apical edges minutely setulose, disc glabrous or with very short sporadic setae; ridges wide and only slightly raised (sometimes wings much to totally reduced and/or elytra much broader apically than basally).

21(22) Prosternum and propleura glabrous but 2–6 strong paramedian setae between procoxae.Pronotum impunctate or with very

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few large punctures; black median stripe not or barely wider in apical than in basal half. Elytron with transverse median band subequally wide, strongly and alternatively dentate at even ridges anteriorly and at odd ridges posteriorly. In female, abdominal tergite VII with9–17 and sternite VIII with more than a dozen strong apical setae; sternite VIII without medio-apical sclerite; gonocoxite IX rather short and glabrous along dorsal edges; urite X evenly membranous ventrally ( Figs 15 , 32 ). Median lobe of aedeagus with apex rounded in cross-section to flatteneddorsoventrally,withadistinctfineventro-apicalcarina in most species .................................... The javanus -group.

22(21) Prosternum and often also propleura distinctly and more or less densely pilose in apical half in addition to several stronger setae between procoxae. Pronotum with rather sparse yet distinct coarse punctures toward apex and often also along sides and base; black median stripe often triangular, much wider apically than basally. Elytral transverse median band either in form of a wide spot or clavate toward suture, mostly moderately dentate at ridge 4 or 5, or 4-to-5 anteriorly and posteriorly. In female, abdominal tergite VII with 18–30 and sternite VIII with about ten strong yet rather

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short setae; sternite VIII with a narrow medio-apical sclerite; urite X with a long median sclerotization between grooves for receipt of gonocoxites IX; these very long and sparsely setulose along dorsal edges ( Figs 3 , 33 ). Aedeagus with apex of median lobe flattened dorsoventrally, finely longitudinally grooved ventro-apically;internal sac symmetrical,without distal basal bulbs ...................... The tripustulatus -group.

Figures

Figs 1—15. Sternite VIII in female: 1 — Stenaptinus beckeri; 2 — S. tamdaoensis; 3 — S. tripustulatus; 4 — S. dissolutus from China; 5 — S. obliteratus; 6 — S. montanus sp.n.; 7 — S. dissolutus from Vietnam; 8 — S. guanxiensis; 9 — S. bidoupensis; 10 — S. dissolutus kalyakini; 11 — S. glabricollis sp.n.; 12 — S. ngoclinhensis; 13 — S. bipartitus; 14 — Pheropsophus ecuadorensis Hubenthal, 1911; 15 — S. lissoderus from Thailand; ic — internal carina; sa — apical setae. Scale bar: 1 mm. Рис. 1—15. Стернит VIII самки: 1 — Stenaptinus beckeri; 2 — S. tamdaoensis; 3 — S. tripustulatus; 4 — S. dissolutus иЗ КитаЯ; 5 — S. obliteratus; 6 — S. montanus sp.n.; 7 — S. dissolutus иЗ Вьетнама; 8 — S. guanxiensis; 9 — S. bidoupensis; 10 — S. dissolutus kalyakini; 11 — S. glabricollis sp.n.; 12 — S. ngoclinhensis; 13 — S. bipartitus; 14 — Pheropsophus ecuadorensis Hubenthal, 1911; 15 — S. lissoderus иЗ Таиланда; ic — внутренний киль; sa — апикальные Щетинки. МасШтаб: 1 мм.

Figs 46—53. Apex of abdomen and reproductive tract of female: 46—47 — Stenaptinus montanus sp.n.; 48 — S. glabricollis sp.n.; 49 — S. guanxiensis; 50 — S. dissolutus from Vietnam; 51 — S. dissolutus from China; 52 — S. obliteratus; 53 — S. bipartitus; bc — bursa copulatrix; gcx — gonocoxite IX; rp — receptacle; sa — apical setae; sg — spermathecal gland. Scale bars: 1 mm. Рис. 46—53. ВерШина брюШка и репродуктивный тракт самки: 46—47 — Stenaptinus montanus sp.n.; 48 — S. glabricollis sp.n.; 49 — S. guanxiensis; 50 — S. dissolutus иЗ Вьетнама; 51 — S. dissolutus иЗ КитаЯ; 52 — S. obliteratus; 53 — S. bipartitus; bc — копулЯтивнаЯ сумка; gcx — гонококсит IX; rp — рецептакул; sa — апикальные Щетинки; sg — желеЗа сперматеки. МасШтаб: 1 мм.

Figs 54—69. Median lobe of aedeagus with everted and inflated internal sac: 54, 58 — Stenaptinus obliteratus; 55, 59 — S. dissolutus from Vietnam; 56, 60 — S. dissolutus from China; 57, 61 — S. glabricollis sp.n.; 62, 66 — S. montanus sp.n.; 63, 67 — S. bidoupensis; 64, 68 — S. guanxiensis; 65, 69 — S. tamdaoensis; 54—57, 62—65 — left aspect; 58—61, 66—69 — dorso-apical aspect; b — body of internal sac; bbd — distal basal bulb; bbp — proximal basal bulb. Scale bars: 1 mm. Рис. 51—66. СреднЯЯ долЯ Эдеагуса с вывернутым и надутым внутренним меШком: 54, 58 — Stenaptinus obliteratus; 55, 59 — S. dissolutus иЗ Вьетнама; 56, 60 — S. dissolutus иЗ КитаЯ; 57, 61 — S. glabricollis sp.n.; 62, 66 — S. montanus sp.n.; 63, 67 — S. bidoupensis; 64, 68 — S. guanxiensis; 65, 69 — S. tamdaoensis; 54—57, 62—65 — слева; 58—61, 66—69 — дорЗо-апикально; b — тело внутреннего меШка; bbd — дистальный баЗальный пуЗырь; bbp — проксимальный баЗальный пуЗырь. МасШтаб: 1 mm.

Figs 31—45. Urite IX ventrally in female: 31 — Stenaptinus beckeri; 32 — S. lissoderus from Thailand; 33 — S. tripustulatus; 34 — S. dissolutus from China; 35 — S. tamdaoensis; 36 — S. bidoupensis; 37 — S. dissolutus kalyakini; 38 — S. guanxiensis; 39 — S. montanus sp.n.; 40 — S. dissolutus from Vietnam; 41 — S. obliteratus; 42 — S. ngoclinhensis; 43 — S. glabricollis sp.n.; 44 — Pheropsophus ecuadorensis; 45 — S. bipartitus; bc — bursa copulatrix; gcx — gonocoxite; lsc — lateral sclerite. Scale bar: 1 mm. Рис. 31—45. Урит IX самки, вентрально: 31 — Stenaptinus beckeri; 32 — S. lissoderus иЗ Таиланда; 33 — S. tripustulatus; 34 — S. dissolutus иЗ КитаЯ; 35 — S. tamdaoensis; 36 — S. bidoupensis; 37 — S. dissolutus kalyakini; 38 — S. guanxiensis; 39 — S. montanus sp.n.; 40 — S. dissolutus иЗ Вьетнама; 41 — S. obliteratus; 42 — S. ngoclinhensis; 43 — S. glabricollis sp.n.; 44 — Pheropsophus ecuadorensis; 45 — S. bipartitus; bc — копулЯтивнаЯ сумка; gcx — гонококсит; lsc — латеральный склерит. МасШтаб: 1 мм.