Stenaptinus marginicollis ( Motschulsky, 1854 )

Fedorenko, D. N., 2021, Stenaptinus (Coleoptera: Carabidae: Brachininae) of Vietnam. Note 2, Russian Entomological Journal 30 (1), pp. 25-42 : 40-42

9. Stenaptinus marginicollis ( Motschulsky, 1854)

Figs 10 , 20–22 , 62 , 68 , 95 .

Motschulsky, 1854: 44 ( Pheropsophus ; Pekin [= Beijing] env.); Chaudoir, 1876: 43; Schauberger, 1923: 53.

MATERIAL. The only pinned specimen, ♀ ( ZMMU) with a mishaped yellow circle and a handwritten label ‘ Pheropsophus / marginicollis / China bor. Motsch’, designated here as lectotype. The specimen is damaged by larval Dermestidae , resulting in the antennomeres 4–11, left hind leg and apical 1/4–1/6 elytra lost.

Additional material ( SIEE): 2♂♂, 2♀♀ , N China, Gansu Province, Liupan Mts 10 km W of Shangguan, 35°03´N / 106°29´E, VI.2005 (V. Siniaev team). — Genitalia examined in two males and one female .

DIAGNOSIS. A robust apterous species; pronotum pale except along margins; black patch on vertex transverse, parallel-sided, with anterior and posterior margins V-shaped; mandibles, tarsi and antennomeres 5–11 distinctly infuscated. Elytra rounded on sides, slightly wider apically than basally, with ridges as wide as intervals and shiny due to obliterate microsculpture. Tergite VII with 14–17 rather short and more or less curved apical setae in female. Apex of aedeagus median lobe flattened dorsoventrally, in dorsal view rounded apically, without ventroapical carina ( Figs 21–22 ). Internal sac in lateral view with body wide and convex at frontal and caudal margins; microtrichia poorly developed.

REDESCRIPTION. BL 16.3–18.7 mm. Body ( Fig. 95 ) robust. Head and pronotum yellow, with patch on vertex, pronotal base, apex, and rather narrow lateral margins black; patch on vertex parallel-sided, slightly transverse, with anterior and posterior margins V-shaped, or pentagonal and somewhat stellate due to its sides concave. Elytral humeral spot rather large, transverse median band rather wide and unevenly dentate, with black or yellow colour extended along ridge 5 fartherst apicad, along lateral margin slightly basad and along interval 8 to a more or less widely pale apical margin, with extreme lateral edge infuscated or not. Femoral apices black, mandibles dark brown to black, tarsi, antennomeres 5–11, apices of 1–4, sometimes entire antennomere 3, brown; often also tibiae more or less infuscated toward apices except externally.

Dorsum glabrous, except for individual setules over elytral disc; head and pronotum densely and finely to conspicuously rugulose. Microsculpture very superficial to obliterate on head and pronotum, coarse on sides of pronotal base. Elytral intervals with very dense and short carinules, ridges shiny due to obliterate microsculpture.

Pronotum quadrate, subcordate, barely shorter than wide, broadest a third from apex, with sides poorly rounded, subsinuate a fifth from base. Base slightly wider than apex, basal margin slightly convex, apical margin truncate or barely convex, basal angles obtuse and more or less blunt. Lateral bead and groove very fine, obliterate basally.

Abdomen ( Figs 10 , 20 ): tergite VII with moderately dense double punctation, with larger punctures coarse, fine punctures very small yet evenly spaced and well traceable. Sternite VIII bisetose or trisetose in male, with ca. 14 strong and straight apical setae in female.

Female gonocoxite IX strongly curved and slightly narrowed apicad ( Fig. 62 ). Spermathecal receptacle tumid, bulbous and rather small ( Fig. 68 ).

GEOGRAPHIC DISTRIBUTION. Northern and eastern China (Gansu, Zhejiang, and Liaoning provinces; Peking, Shanghai). All records of this species in Vietnam [Park et al., 2006] refer to different species.

HABITATS AND HABITS. No data, except that the specimens listed have been collected together with those of S. jessoensis .

COMMENTS. The female lectotype is distinctive from the other examined specimens of this species in only having the elytral pale pattern overdeveloped, with black colour reduced to a narrow zigzag between large humeral spot and wide median band. This band is subequally dentate, anteriorly at the ridges 4, 6 and 8, posteriorly at the ridges 3, 5, 7 and at the lateral edge. It touches the sutural ridge and reaches lateral margin, being extended along lateral edge to humeral spot and along interval 8 in its outer half to rather a widely pale apex, thus leaving extreme lateral margin black medially and at the apex of the humeral spot.

This species was redescribed by comparing it with S. suensoni in many points [ Schauberger, 1923]. Schauberger also described the aedeagus of S. marginicollis for the first time and reported the species from Shanghai, Hangchow (= Handzhou, Zhejiang) and Mukden (= Shenyang, Liaoning), China.

Aknowledgements. I am much obliged to Dr. Roman Dudko ( SZM), Alexei Gusakov ( ZMMU), Dr. Boris Kataev ( ZISP), and Dr. Kirill Makarov ( MSPU) for the loan of material under their care, and to Azadeh Taghavian-Azari ( MNHN) and Yu. Sundukov ( EASC) for high-resolution images of type and non-type specimens. My sincere thanks also to Alexander Kompantsev ( SIEE), Igor Melnik ( Moscow ), Dr.Natalya Belyaeva and Dr. Alexander Prosvirov (The Moscow State University) for donating specimens and to Dr. Alexey Abramov ( ZISP) and Dr. Nikolay Poyarkov (The Moscow State University) for their assistance in collecting beetles in Vietnam. This study was funded by the Presidium of the Russian academy of sciences, Program No. 41 “Biodiversity of natural systems and biological resources of Russia ”.

Figures

Figs 1–10. Stenaptinus spp., sternite VIII in female: 1 — S. stenoderus; 2 — S. lissoderus; 3, 6 — S. agnatus from Cat Tien; 4 — S. sumatrensis sp.n.; 5 — S. c. consularis; 6 — S. montanus sp.n.; 7 — S. fimbriatus; 8 — S. consularis flaviceps ssp.n.; 9 — S. javanus; 10 — S. marginicollis. Scale bars: 1 mm. Рис. 1–10. Stenaptinus spp., стернит VIII самки: 1 — S. stenoderus; 2 — S. lissoderus; 3, 6 — S. agnatus иЗ Катьена; 4 — S. sumatrensis sp.n.; 5 — S. c. consularis; 6 — S. montanus sp.n.; 7 — S. fimbriatus; 8 — S. consularis flaviceps ssp.n.; 9 — S. javanus; 10 — S. marginicollis. МасШтаб: 1 мм.

Figs 11–20. Stenaptinus spp., tergite VIII in female: 11 — S. stenoderus; 12 — S. lissoderus; 13, 16 — S. agnatus from Cat Tien; 14 — S. sumatrensis sp.n.; 15 — S. c. consularis; 16 — S. montanus sp.n.; 17 — S. fimbriatus; 18 — S. consularis flaviceps ssp.n.; 19 — S. javanus; 20 — S. marginicollis; adr — apical depigmented region; psm — posteromedian sclerotized region. Scale bars: 1 mm. Рис. 11–20. Stenaptinus spp., тергит VIII самки: 11 — S. stenoderus; 12 — S. lissoderus; 13, 16 — S. agnatus иЗ Катьена; 14 — S. sumatrensis sp.n.; 15 — S. c. consularis; 16 — S. montanus sp.n.; 17 — S. fimbriatus; 18 — S. consularis flaviceps ssp.n.; 19 — S. javanus; 20 — S. marginicollis; adr — апикальнаЯ депигментированнаЯ область; psm — постеро-медиальнаЯ склеротиЗациЯ. МасШтаб: 1 мм.

Figs 21–28. Stenaptinus spp., median lobe of aedeagus with everted and inflated internal sac: 21–22 — S. marginicollis; 23–24 — S. madagascariensis; 25–26 — S. fumigatus; 27–28 — S. javanus; 21, 23, 25, 27 — left aspect; 22, 24, 26, 28 — dorso-apical aspect; bd — body of internal sac; dbl — left distal basal bulb; ma — membranous apex; pb — proximal basal bulb. Scale bars: 1 mm. The arrowhead shows the base of membranous apex, which is conformable to gonopore. Рис. 21–28. Stenaptinus spp., среднЯЯ долЯ Эдеагуса с вывернутым и надутым внутренним меШком: 21–22 — S. marginicollis; 23– 24 — S. madagascariensis; 25–26 — S. fumigatus; 27–28 — S. javanus; 21, 23, 25, 27 — слева; 22, 24, 26, 28 — дорЗо-апикально; bd — тело внутреннего меШка; dbl — левый дистальный баЗальный пуЗырь; ma — мембраноЗнаЯ верШина; pb — проксимальный баЗальный пуЗырь. МасШтаб: 1 мм. Стрелкой покаЗано основание мембраноЗной верШины внутреннего меШка, соответствуюЩее гонопору.

Figs 56–64. Stenaptinus spp., urite IX in female, ventral aspect: 56 — S. sumatrensis sp.n.; 57 — S. consularis flaviceps ssp.n. from Gia Lai Prov.; 58 — S. stenoderus; 59 — S. javanus; 60 — S. c. consularis; 61 — S. agnatus; 62 — S. marginicollis; 63 — S. fimbriatus; 64 — S. lissoderus; bc — bursa copulatrix; rp — spermathecal receptacle; sg — spermathecal gland. Scale bars: 1 mm. Рис. 56–64. Stenaptinus spp., урит IX самки вентрально: 56 — S. sumatrensis sp.n.; 57 — S. consularis flaviceps ssp.n. from Gia Lai Prov.; 58 — S. stenoderus; 59 — S. javanus; 60 — S. c. consularis; 61 — S. agnatus; 62 — S. marginicollis; 63 — S. fimbriatus; 64 — S. lissoderus; bc — копулЯтивнаЯ сумка; rp — семеприемник сперматеки; sg — желеЗа сперматеки. МасШтаб: 1 мм.

Figs 65–70. Stenaptinus spp., female reproductive tract: 65 — S. stenoderus; 66 — S. fimbriatus; 67 — S. javanus; 68 — S. marginicollis; 69 — S. agnatus; 70 — sumatrensis sp.n.; bc — bursa copulatrix; ov — common oviduct; rp — spermathecal receptacle; sc — seminal canal; sg — spermathecal gland. Scale bar: 1 mm. Рис. 65–70. Stenaptinus spp., репродуктивный тракт самки: 65 — S. stenoderus; 66 — S. fimbriatus; 67 — S. javanus; 68 — S. marginicollis; 69 — S. agnatus; 70 — sumatrensis sp.n.; bc — копулЯтивнаЯ сумка; ov — непарный Яйцевод; rp — семеприемник сперматеки; sa — апикальные Щетинки; sс — семенной канал; sg — желеЗа сперматеки. МасШтаб: 1 мм.

Figs 90–105. Stenaptinus spp., variation of dorsal pattern in specimens from different localities: 90–94 — S. consularis; 95 — S. marginicollis; 96–97, 103–105 — S. stenoderus; 98–102 — S. lissoderus; 90–91, 101–102, 104 — Northern Thailand; 92 — Gia Lai Prov.; 93, 96 — Pu Hoat NP; 94 — Ke Go NP; 97 — Tam Dao; 98–100, 103 — India; 105 — Song Thanh NP. Рис. 90–105. Stenaptinus spp., иЗменчивость окраски верха у особей иЗ раЗных местонахождений: 90–94 — S. consularis; 95 — S. marginicollis; 96–97, 103–105 — S. stenoderus; 98–102 — S. lissoderus; 90–91, 101–102, 104 — северный Таиланд; 92 — Пров. ЗЯлай; 93, 96 — нац. парк Пухоат; 94 — нац. парк Кего; 97 — Тамдао; 98–100, 103 — ИрдиЯ; 105 — нац. парк Сонгтхань.