Stenaptinus bidoupensis, Fedorenko, 2013

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

The bidoupensis species group.

DIAGNOSIS. Additional characters not mentioned in the key are as follows: Aedeagus apex nearly symmetric, long, triangular, very pointed, dorsoventrally flattened at base ( Figs 62–63, 66–67 ).

In female, tergite VII with 13–22 apical setae, sternite VIII sparsely pubescent, neither median apical sclerotized process nor membranous area just in front of apical setae; tergite VIII on each side of median line with a triangular median sclerotization (psa), apical depigmented region (adr) very short, not more than a fourth as long as the tergite along midline, sparsely setulose, without distinct tubercles ( Figs 6, 9, 12 , 18, 21, 24 , 36, 39, 42 ). Receptacle Y-shaped, its horns slightly unequal in length ( Fig. 47 ). Tergite VII with 13–16 (15, n=13) or 13–15, or 16–21 apical setae in S. bidoupensis , S. ngoclinhensis (3 ♀♀), and S. montanus sp.n., respectively; one female of S. bidoupensis from the Chu Yang Sin National Park has 21 setae.

GEOGRAPHIC DISTRIBUTION. Highlands of the Tay Nguen Plateau ( Central Highlands ) south to the Dalat Plateu within Ha Tinh, Kon Tum, Gia Lai, Dak Lak, Lam Dong, and Khanh Hoa provinces, central and southern Vietnam ( Fig. 79 ) .

HABITATS AND HABITS. All the specimens examined were hand collected and/or taken in pitfall traps in broad-leaved monsoon forests at 1400–1650 m elevations. This may suggest that the only known specimen of S. similis has been rather occasionally taken at 400–700 m elevation.

COMMENTS. This group includes four very similar species. Because two of them were described based on specimens conserved for long in alcohol, which prevented the internal sac of aedeagus from being properly prepared, everted and inflated internal sacs have been compared in two species only. Their great similarity ( Figs 62–63, 66–67 ) may suggest subspecies rather than species status of some taxa. But the results obtained for females point to the contrary, since gonocoxite IX is distinctly longer in S. bidoupensis than in the other two species examined ( Figs 36, 39, 42 , 46 ).

Four species outside Vietnam, S. krichna ( Maindron, 1906) = scythropus : ( Kirschenhofer, 2010), S. scythropus ( Andrewes, 1923) , S. andrewesi (Jedlička, 1964) , and S. nepalensis ( Kirschenhofer, 2010) , match well diagnostic features other than genitalic ones of the bidoupensis -group. All the species have the elytral ridges well-developed, narrow and entire, and occur in the regions adjacent to Indochina, i.e., northeastern India, eastern Nepal, Bhutan, etc. Stenaptinus krichna is distinctive in having black legs (vs. pale in the other species) and the remaining three are very similar. Out of them, S. andrewesi has the head nearly black (vs. anteriorly pale) and pronotal sides slightly converging to nearly right basal angles (vs. diverging slightly toward slightly acute basal angles in S. scythropus or running parallel in front of right basal angles in S. nepalensis ).

Figures

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 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 16—30. Tergite VIII in female: 16 — Stenaptinus beckeri; 17 — S. tamdaoensis; 18 — S. ngoclinhensis; 19 — S. dissolutus from China; 20 — S. guanxiensis; 21 — S. montanus sp.n.; 22 — S. dissolutus kalyakini; 23 — S. obliteratus; 24 — S. bidoupensis; 25 — S. dissolutus from Vietnam; 26 — S. glabricollis sp.n.; 27 — S. tripustulatus; 28 — Pheropsophus ecuadorensis; 29 — S. bipartitus; 30 — S. lissoderus from Thailand; adr — apical depigmented region; as — anterior sclerotized region; psa — postero-apical sclerotized region; psa — posteromedian sclerotized region. Scale bar: 1 mm. Рис. 16—30. Тергит VIII самки: 16 — Stenaptinus beckeri; 17 — S. tamdaoensis; 18 — S. ngoclinhensis; 19 — S. dissolutus иЗ КитаЯ; 20 — S. guanxiensis; 21 — S. montanus sp.n.; 22 — S. dissolutus kalyakini; 23 — S. obliteratus; 24 — S. bidoupensis; 25 — S. dissolutus иЗ Вьетнама; 26 — S. glabricollis sp.n.; 27 — S. tripustulatus; 28 — Pheropsophus ecuadorensis; 29 — S. bipartitus; 30 — S. lissoderus иЗТаиланда; adr— апикальнаЯ депигментированнаЯобласть; as— переднЯЯ склеротиЗациЯ; psa— постеро-апикальнаЯсклеротиЗациЯ; psm — постеро-медиальнаЯ склеротиЗациЯ. МасШтаб: 1 мм.

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.

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.

Fig. 79. Disribution pattern map of the species of the bidoupensis- and dissolutus-group. Рис. 79. Карта распространениЯ видов групп bidoupensis и dissolutus.