Eustra dalatensis 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

4. Eustra dalatensis Fedorenko , sp.n.

Figs 5 , 24–25 , 29 , 41–42 .

MATERIAL. Holotype ♂ (ZMMU) labelled: ‘ Vietnam, Dak Lak Prov [ince]., Chu Yang Sin Nat [io]n[al]. Park , 12º23´48´´N 108º20´59´´E, upper flow of Krong Kmar riv[er], h= 1000 m, 30.III– 14.IV.2012, D.Fedorenko leg. ’ Paratype ♀ (SIEE): ‘S[outhern] Vietnam, Lam Dong Prov [ince]., Bi Doup — Nui Ba Nat [ure]. Res [erve]., env. Long Lanh , 12º10´44´´N / 108º40´44´´E, h= 1400–1600 m, 30.IV.2009, leg. D.Fedorenko’ .

DESCRIPTION. Very similar to the previous species except as follows: BL 3.5–3.7 mm, body ( Fig. 5 ) very shiny, elytral spots smaller, extending from middle to 4/5 elytra. Labrum and elytral base with distinct microsculpture, otherwise dorsal microsculpture missing, being very superficial on clypeus, anterior part of frons, and neck; elytral aciculate microsculpture outside and partly including glabrous submarginal area. Pronotum glabrous except a few setae along apex.

Head: neck constriction moderately deep, vertex moderately convex, Supra-ocular carina very fine above eye, obliterate before and behind, hardly separable from dense longitudinal wrinkles on each side; genae nearly even and straight. Labrum truncate apically. Antennomeres 5–10 barely transverse, nearly as long as wide.

Pronotum: PW / PL 1.50–1.57, PW / HW 1.06–1.14, PLw / PL 0.21–0.25, PB /PA 0.88–0.93, sides sinuate behind apical angles, sides of base subsinuate; apex sinuate; lateral edge nearly smooth, with 1–2 subtle denticles before almost right basal angles.

Elytra longer and barely dilated apicad, EL / EW 1.42– 1.45, EW / PW 1.67–1.77; sides slightly and evenly rounded. USS consisting of 11-12+4+5 setae.

Legs. Mesotarsomere 1 distinctly longer than mesotarsomere 5 while distinctly shorter than mesotarsomeres 2–4 combined, TF2 1.17–1.33: 1.36–1.50; TF3 1.54–1.86: 1.46–1.71.

Aedeagus ( Figs 24–25 , 29 , 41–42 ): median lobe large, with apex toothed; right paramere distinctly longer than the left one, being in form of a straight razor. Internal sac with large spiniform apical sclerites.

DIAGNOSIS. Distinctive from E. posteroguttata sp.n. chiefly in having much less convex vertex, glabrous pronotum, smaller elytral spots, and less distinct dorsal microsculpture, in addition to very distinctive aedeagus.

DISTRIBUTION. Known from two localities in the Dalat Plateau, Southern Vietnam.

NAME. Toponymic, referring to the type locality of the species.

HABITATS AND HABITS. As described for the genus, except at higher elevations.

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.