Eustra posteroguttata 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 : 10-12

3. Eustra posteroguttata Fedorenko , sp.n.

Figs 3 , 10–12 , 27 , 39–40 .

MATERIAL. Holotype ♂ ( ZMMU) labelled: ‘S Vietnam, N Dongnai [= Dong Nai] Pr[ovince]., Nam Cat Tien Nat. Park , Exped.Russ.-Vietnamese , Tropical Centre , 26.V.2005, leg. D.Fedorenko’. Paratypes ( ZMMU, SIEE): 2♀♀, same data except 25.V. or 3.VI.; ♂, ♀, same data except 26.X.2004 or 20–26.X.2004, respectively; ♂, same data except 18.V–18.VI.2005 preceded by ‘W[indow]T[rap]-1’; 2♂♂, ♀, same, but 19.V–18.VI.2005 preceded by either ‘WT-2’ or ‘WT-4’, or ‘WT-3’, respectively ; 2♀♀, ‘ 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♂♂, 2♀♀, ‘ Vietnam, Gia Lai Province, ~ 40 km ENE of Pleiku , 14º12´11´´N / 108º18´54´´E, Kon Ka Kinh Natn. Park, h= 890 m, 9–22.V.2016, D.Fedorenko leg.’; 2♀♀, same locality, except for ~ 55 km ENE of Pleiku , 14º18´22´´N / 108º26´23´´E, …, h= 820 m, 8–20.V.2017; ♂, 2♀♀ , same data except 14º18´40´´N / 108º26´37´´E, …, h= 730 m.

DESCRIPTION. As E. cariniceps sp.n. except for the following: Body ( Fig. 3 ) larger, BL 3.3–3.6 mm, shiny pale brown; elytral spots varying in size, being mostly large, extending from 2/5 elytra to just before apex, rather narrowly separated along suture and well separated from lateral margin, sometimes either almost reaching lateral margin or smaller to totally reduced. Dorsal microsculpture distinct over labrum, slightly less so on clypeus and neck, highly superficial and hardly traceable on the rest of head and on pronotum; elytral microsculpture missing to hardly traceable (in some females); aciculate microsculpture occupying more extensive lateral region, often expanded onto submarginal glabrous area, sometimes traceable throughout elytra except along suture. Head sparsely pubescent, pronotum very sparsely so, elytra densely pubescent, more so toward bases; setigerous punctures tuberculate.

Head with very convex vertex due to neck constriction being very deep throughout. Very fine supra-ocular carina traceable above eye only, imperceptible to obliterate before and behind; genae subconvex to subangulate. Frontoclypeal suture slightly concave. Labrum apically convex or subtruncate. Mandibular scrobe bisetose.

Pronotum cordate, three fifths wider than long, PW / PL 1.50–1.66 (1.59, n=5), PW / HW 1.10–1.18 (1.13), broadest a fourth from apex, PLw / PL 0.24-0.30 (0.27, n=8), sides distinctly sinuate in front of basal angles, mostly straight or indistinctly sinuate just behind apical ones. Base slightly narrower than apex, PB /PA 0.82–0.89 (0.86), its sides mostly straight; apex sinuate; basal angles sharp, subrectangular to obtuse. Lateral margin narrowly explanate and strongly reflexed in basal half, more or less widely explanate before; lateral edge nearly smooth.

Elytra short, EL / EW 1.31–1.39 (1.33, n=5), EW / PW 1.66–1.81(1.75), broadest behind middle; base very gently oblique towards peduncle, humeri more rounded, sides diverging slightly apicad, nearly straight in middle third to two fourths. USS consisting of 10-13+4-5+5 setae. Submarginal glabrous area mostly small.

Legs. TF2 1.17–1.27 (1.20): 1.17–1.38 (1.25), TF3 1.56–2.0 (1.77): 1.25–1.72 (1.48).

Aedeagus ( Figs 10–12 , 27 , 39–40 ): median lobe with apex triangular and narrowly rounded; right paramere securiform, longer than the left one. Internal sac with large spiniform apical sclerites, including two, very large, dorsal ones.

DIAGNOSIS. Easily recognizable by the combination of very deep neck constriction, very convex vertex, nearly smooth lateral pronotal edge, and large elytral spots in almost postmedian position. This species is closely allied to E. matanga matanga . Both share very convex vertex before deep neck constriction and very similar aedeagus, but E. m. matanga has elytra longer, with ill-defined spot, labrum truncate, ocular ridge distinct, pronotal base barely wider relative to apex, internal sac of aedeagus with apical sclerites being different in shape, and right paramere slightly less rounded dorso-apically ( Figs 7–9 , 32 , 35–36 ).

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

NAME. Refers to the position of the elytral spots.

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 7–18. Median lobe of aedeagus: 7–9 — Eustra matanga matanga; 10–12 — E. posteroguttata sp.n.; 13–15 — E. csikii; 16–18 — E. parallela sp.n.; 7, 10, 13, 16 — right aspect; 8, 17 — ventral aspect; 9, 12, 15, 18 — left aspect; 11, 14 — dorsal aspect;. Scale bars: 0.5 mm. Рис. 7–18. СреднЯЯ долЯ Эдеагуса: 7–9 — Eustra matanga matanga; 10–12 — E. posteroguttata sp.n.; 13–15 — E. csikii; 16–18 — E. parallela sp.n.; 7, 10, 13, 16 — справа; 8, 17 — сниЗу; 9, 12, 15, 18 — слева; 11, 14 — 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.