Eustra nageli subglabra Fedorenko, 2019

Fedorenko, D. N., 2019, New or little-known species of the genus Eustra Schmidt-Göbel, 1846 (Coleoptera: Carabidae: Ozaenini), Russian Entomological Journal 28 (1), pp. 5-16 : 12-14

6. Eustra nageli subglabra Fedorenko , ssp.n.

Figs 4 , 19–21 , 26 , 43–44 .

MATERIAL. Holotype ♂ ( ZMMU) labelled: ‘S Vietnam, N Dongnai [= Dong Nai] Pr [ovince]., Nam Cat Tien Nat. Park , Exped.Russ.-Vietnamese, Tropical Centre, W[indow]T[rap]-3, 19.V.–18.VI.2005, leg. D.Fedorenko’ . Paratypes ( SIEE): ♂, 2♀♀, same data; ♂, same data except WT-4; ♀, same data except WT-5, 20.V. –; ♂, 5♀♀, ‘ Vietnam, Binh Phuoc Prov [ince]., Bu Gia Map Nat. Park , 12º11´37´´N / 107º12´21´´E, h= 350–540 m, 16– 17.IV.2009, leg. D. Fedorenko’ .

DESCRIPTION. Body ( Fig. 4 ) rather large and robust, BL 3.4–3.7 mm, shiny pale brown, elytra slightly dull in female; each elytron with a rounded to subquadrate spot between middle and 3/4 elytra; the spots widely separated along suture and not reaching lateral margin. Dorsal microsculpture superficial on labrum, clypeus and neck, hardly traceable to obliterate on frons and vertex, almost indistinct to obliterate on pronotum. Elytral microsculpture almost indistinct to obliterate in male, very distinct in female; aciculate microsculpture along sides almost imperceptible in male, very fine in female. Head and pronotum sparsely pubescent, elytra moderately densely pubescent and faintly tuberculate; pubescence very short, on disc about half as long as distance between neighbouring two setae in longitudinal row.

Head with neck constriction imperceptible or traceable on sides only, vertex flat. Supra-ocular carina fine, mostly distinct medially and obliterate before and behind, sometimes quite otherwise. Frontoclypeal suture slightly concave. Labrum truncate apically, minutely emarginate between inner two pairs of setae. Antennomeres 5–10 increasingly yet slightly transverse. Mandibular scrobe bisetose.

Pronotum cordate, two thirds wider than long, PW / PL 1.55–1.72 (1.65, n=5), PW / HW 1.15–1.22 (1.18), broadest a fifth from apex, PLw / PL 0.19–0.24 (0.22, n=6), sides distinctly sinuate in front of basal angles, almost indistinctly sinuate just behind apical angles. Base barely narrower than apex, PB /PA 0.86–0.91 (0.88), its sides sinuate or subsinuate, basal angles sharp, subrectangular to obtuse; apex deeply sinuate. Basal foveae round and deep, each extended forward into a more or less distinct submarginal line or the latter isolated. Lateral margin rather narrowly explanate and, along with basal angles, very slightly reflexed in basal half, more widely explanate in apical half; lateral bead very fine, strongly reflexed, disappearing just in front of basal angle. Lateral edge minutely denticulate or tuberculate, more distinctly so in basal half, with 11–13 denticles traceable in total. Basal bead missing or laterally imperceptible.

Elytra short and wide, EL / EW 1.26–1.31 (1.28, n=5), EW / PW 1.68–1.82 (1.74), broadened slightly apicad; base very slightly oblique towards peduncle, humeri rounded at apex, sides rounded. USS consisting of 10-13+5+5 setae. Submarginal glabrous area large.

Legs. Mesotarsomere 1 longer than mesotarsomeres 2– 4 combined and distinctly longer than mesotarsomere 5, TF2 1.34–1.54 (1.40): 1.12–1.38 (1.23); metatarsomere 1 a third longer than metatarsomeres 2–4 combined and much longer than mesotarsomere 5, TF3 1.63–1.80 (1.73): 1.25– 1.39 (1.34).

Aedeagus ( Figs 19–21 , 26 , 43–44 ) large, with very wide obtrapezoidal apex; right paramere clavate, slightly longer than left one. Internal sac with large, spiniform, apical sclerites, including large subtriangular sclerite and a very slender dorsal one having apex somewhat hooked.

DIAGNOSIS. Distinctive from E. nageli nageli Deuve, 2005 from Nepal chiefly in having very short and sparse dorsal pubescence, aedeagus apex barely shorter, and the dorsal sclerite of the internal sac of aedeagus being less curved apically.

DISTRIBUTION. Southern Vietnam.

NAME. Refers to the subglabrous body dorsum.

HABITATS AND HABITS. Six of totally seven specimens of the type series were collected in window traps in a tropical monsoon forest. One specimen from the Bu Gia Map National Park was taken by hands under bark of a large standing dead tree, together with specimens of E. cariniceps sp.n. and E. posteroguttata sp.n.

COMMENTS. Dr. Th. Deuve (MNHM) was kind enough to compare aedeagus of the holotype of E. nageli with my digital images of aedeagus of E. nageli subglabra ssp.n. He [pers. communication] guessed genitalic differences between the two taxa to be of subspecific level. I share his point of wiew, with reservation that E. nageli subglabra ssp.n. may be close yet separate species, which surmise is additionally based on a very wide spatial gap between the ranges of the two taxa.

Figures

Figs 1–6. Eustra spp., dorsal habitus: 1 — E. parallela sp.n.; 2 — E. cariniceps sp.n.; 3 — E. posteroguttata sp.n.; 4 — E. nageli subglabra ssp.n.; 5 — E. dalatensis sp.n.; 6 — E. csikii. Рис. 1–6. Eustra spp., габитус дорЗально: 1 — E. parallela sp.n.; 2 — E. cariniceps sp.n.; 3 — E. posteroguttata sp.n.; 4 — E. nageli subglabra ssp.n.; 5 — E. dalatensis sp.n.; 6 — E. csikii.

Figs 19–25. Median lobe of aedeagus: 19–21 — Eustra nageli subglabra ssp.n.; 22–23 — E. cariniceps sp.n.; 24–25 — E. dalatensis sp.n.; 19, 22, 24 — right aspect; 20, 23 — ventral aspect; 21 — left aspect; 25 — dorsal aspect. Scale bars: 0.5 mm. Рис. 19–25. СреднЯЯ долЯ Эдеагуса: 19–21 — Eustra nageli subglabra ssp.n.; 22–23 — E. cariniceps sp.n.; 24–25 — E. dalatensis sp.n.; 19, 22, 24 — справа; 20, 23 — сниЗу; 21 — слева; 25 — сверху. Масштаб: 0.5 мм.

Figs 26–32. Median lobe of aedeagus in plane of apex (~left ventrobasal aspect): 26 — Eustra nageli subglabra ssp.n.; 27 — E. posteroguttata sp.n.; 28 — E. cariniceps sp.n.; 29 — E. dalatensis sp.n.; 30 — E. csikii; 31 — E. parallela; 32 — E. matanga matanga. Scale bar 0.5 mm. Рис. 26–32. СреднЯЯ долЯ Эдеагуса в плоскости вершины (~вентробаЗально слева): 26 — Eustra nageli subglabra ssp.n.; 27 — E. posteroguttata sp.n.; 28 — E. cariniceps sp.n.; 29 — E. dalatensis sp.n.; 30 — E. csikii; 31 — E. parallela; 32 — E. matanga matanga. Масштаб 0.5 мм.

Figs 33–46. Parameres: 33–34 — Eustra cariniceps sp.n.; 35–36 — E. matanga matanga; 37–38 — E. csikii; 39–40 — E. posteroguttata sp.n.; 41–42 — E. dalatensis sp.n.; 43–44 — E. nageli subglabra ssp.n.; 45–46 — E. parallela sp.n.; 33, 35, 37, 39, 41, 43, 45 — right paramere, left aspect; 34, 36, 38, 40, 42, 44, 46 — left paramere, right aspect. Scale bar 0.5 mm. Рис. 33–46. Парамеры: 33–34 — Eustra cariniceps sp.n.; 35–36 — E. matanga matanga; 37–38 — E. csikii; 39–40 — E. posteroguttata sp.n.; 41–42 — E. dalatensis sp.n.; 43–44 — E. nageli subglabra ssp.n.; 45–46 — E. parallela sp.n.; 33, 35, 37, 39, 41, 43, 45 — праваЯ парамера, вид слева; 34, 36, 38, 40, 42, 44, 46 — леваЯ парамера, вид справа. Масштаб 0.5 мм.