Eustra cariniceps 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 : 9

1. Eustra cariniceps Fedorenko , sp.n.

Figs 2 , 22–23 , 28 , 33–34 .

MATERIAL. Holotype ♂ (ZMMU) labelled: ‘S Vietnam, N Dongnai [= Dong Nai] Pr [ovince]., Nam Cat Tien Nat. Park, Exped.Russ.-Vietnamese, Tropical Centre , 26.X.2004, leg. D.Fedorenko’ . Paratypes (ZMMU, SIEE): 3♂♂, ♀, same data; 4♂♂, 4♀♀, same data except 24–25.X.; ♂, ♀, same data except 20–26.X.; ♀, same data except 26.XI.; 3♂♂, ♀, ‘ 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’ ; ♂, 2♀♀, ‘ Vietnam, Gia Lai Province, ~ 55 km ENE of Pleiku , 14º17´45´´N / 108º26´57´´E, Kon Ka Kinh Natn. Park, h= 600 m, 8–20.V.2017 ’.

DESCRIPTION. BL 2.8–3.2 mm, body ( Fig. 2 ) very shiny, pale brown, elytra each with a rounded to subquadrate median spot extending from 1/3 to 3/4 elytra; the spots distinctly separated along suture and reaching lateral margin or almost so. Dorsal microsculpture very superficial on labrum, clypeus and anterior part of frons, obliterate behind, including on pronotum and elytra, hardly traceable here and there along explanate pronotal margin; elytra with aciculate microsculpture outside glabrous submarginal area. Head and pronotum rather sparsely yet distinctly pubescent, elytra densely and evenly punctate-pubescent, setae as long as or barely longer than distance between neighbouring two in longitudinal row.

Head: vertex moderately convex, neck constriction shallow medially and deeper laterally. Supra-ocular carina mostly entire, sharp, black, and directly extended into supra-antennal plates; genae slightly uneven, interrupted by ocular ridge. Frontoclypeal suture concave. Labrum apically evenly convex or with a median tubercle produced. Antennomeres 5–10 increasingly transverse, antennomere 10 distinctly transverse. Mandibular scrobe with 0–1 seta.

Pronotum subcordate, almost square, half wider than long, PW / PL 1.47–1.60 (1.52, n=5), PW / HW 1.10–1.14 (1.12), broadest a third from apex, PLw / PL 0.23–0.31 (0.25, n=8), sides distinctly sinuate in front of basal angles. Base barely narrower than apex, PB /PA 0.88–0.96 (0.94), its sides mostly subsinuate; apex subsinuate to truncate between acute and porrect apical angles; basal angles sharp, rectangular or subrectangular. Basal foveae large, deep, rounded, slightly oblong; each mostly with an impressed line at bottom, these lines running parallel behind basal transverse impression while strongly diverging before to extend into a more or less deep submarginal lines that almost reach apex. Explanate lateral margin narrow, more reflexed basally, rather widely explanate-reflexed in apical half in the case of a deeper submarginal line; lateral edge with 2–4 tubercles in basal half and minutely tuberculate to nearly smooth before. Basal bead fine to missing.

Elytra moderately long, EL / EW 1.36–1.44 (1.41, n=5), EW / PW 1.61–1.71 (1.66); base oblique towards peduncle, humeri subangulate and blunt, sides poorly rounded, nearly parallel. USS consisting of 10+3-7+5 setae. Submarginal glabrous area large and glossy.

Legs. Mesotarsomere 1 as long as mesotarsomeres 2–4 combined and distinctly longer than mesotarsomere 5, TF2 1.16–1.40 (1.27): 1.17–1.40 (1.29), metatarsomere 1 distinctly longer than metatarsomeres 2–4 combined and much longer than mesotarsomere 5, TF3 1.54–2.0 (1.73): 1.43–1.67 (1.55).

Aedeagus ( Figs 22–23 , 28 , 33–34 ) small; median lobe with widely rounded apex; right paramere shorter than left one, fairly wide, attenuated apicad, with apex truncate. Internal sac without apical sclerites.

DIAGNOSIS. Recognizable by the combination of body small and unicoloured, with dark elytral spots in medial position, elytra very shiny following no microsculpture, especially so over a fairly wide submarginal area, elytral pubescence dense and moderately long, labrum convex anteriorly, neck-constriction shallow medially, supraocular ridge conspicuous and dark, pronotal edge denticulate at least basally. Aedeagus is very similar to that of E. homyi Deuve, 2001 , except for apex being widely rounded, with no preapical sinuation at right margin (vs. wide yet slightly triangular, with a shallow sinuation).

DISTRIBUTION. Southern and Central Vietnam: Dong Nai, Binh Phuoc, and Gia Lai provinces.

NAME. Refers to the conspicuous supraocular carina.

HABITATS AND HABITS. As described for the genus.

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.