Pterostichus (Vietosteropus) kuznetsovi Fedorenko, 2020

Fedorenko, D. N., 2020, New taxa of Pterostichini (Coleoptera: Carabidae) from Vietnam, Russian Entomological Journal 29 (1), pp. 38-52 : 46-48

Pterostichus (Vietosteropus) kuznetsovi Fedorenko , sp.n.

Figs 29–30 , 33–38 .

MATERIAL. Holotype ( ZMMU) and paratype (SIEE), ♂♂, labelled: ‘ Vietnam, Quang Nam Prov[ince]., Nam Gian Distr [ict]., Song Thanh Nat [io]n[al]. Park, 15°34´07´´N / 107°23´13´´E, h= 1010 m, 23.IV–11.V.2019, leg. D. Fedorenko’.

DIAGNOSIS. With characters of the subgenus and of the formerly monobasic gialaiensis -group [ Fedorenko , 2017]. Its nominal species, P. gialaiensis Fedorenko, 2017, is distinctive chiefly in having pronotal basal fovea and sulci impunctate and aedeagus distinctive. Additional differences are superficial: pronotal basal angles more rounded apically, explanate lateral margin barely narrower, inner basal sulcus deep. Aedeagus: median lobe with apex widely rounded and projecting laterad beyond everted and inflated internal sac; this latter with PBR much larger and directed apicad and PBL slightly different in shape due mainly to vesicles lv1 and lv2 and lv3 distinct.

Besides, the submentum is bisetose in P. gialaiensis (vs. quadrisetose in the new species). However, more material is necessary to decide whether this difference is species-specific or it may have come from individual variability of P. gialaiensis .

DESCRIPTION. BL 17–17.1 mm. Body ( Fig. 30 ) shiny black. Antennae brownish toward apices. Dorsal microsculpture absent from head, very superficial on pronotum and elytra, consisting of very small meshes, pronotal meshes being rectangular and moderately transverse, elytral ones more transverse, fusiform, becoming dense transverse lines here and there. Explanate lateral margin of pronotum with hardly traceable microsculpture consisting of slightly longitudinal meshes.

Head: Eyes convex, gena 0.37 times as long as eye. Frontal sulci very deep impunctate, diverging and slightly S-shaped, nearly parallel just before and behind, reaching the level of anterior supra-ocular seta. Neck constriction indistinct, hardly traceable only laterally. Submentum quadrisetose.

Pronotum subquadrate, PW / PL 1.32, PW /HW 1.55, evenly rounded on sides, less so in basal two fifths, with basal angles obtuse and slightly blunt; basal margin gently concave at middle; apex evenly concave between narrowly rounded apical angles. Explanate lateral margin in form of a wide bead in front of anterolateral seta, otherwise gradually broadening basad and rather wide in basal half. Lateral grooves deep in apical three quarters and almost directly extended into outer basal sulci; these more shallow, slightly C-shaped (convexity inward), obliterate just basally. Inner basal sulci moderately deep, straight, running on and barely converging in basal third. Basal fovea finely and moderately densely punctate in and between basal sulci. Median line moderately deep, almost obliterate near base and apex. Both transverse impressions, basal and apical, imperceptible. Anterolateral seta inserted in lateral groove, basolateral seta close to basal angle.

Elytra elliptic, broadest behind middle, EW/EL 1.58– 1.62, EW/ PW 1.14–1.15; sides poorly rounded in basal half, preapical sinuation and internal preapical plica distinct, apices truncate combined, with tips blunt. Humeral angle obtuse. Striae deep, densely punctate, punctures becoming increasingly large from very fine in stria 1 to medium-sized in stria 10; parascutellar striole missing. Intervals convex, subcostate to costate laterally and apically; 8 th as wide as 7 th; 7 th, 5 th and 3 rd confluent apicad in succession; 1 st merging into while 3rd separate from lateral bead apically; no costa or carina outside interval 9. Parascutellar seta just behind basal ridge. D2/EL 0.44–0.45. USS: 20–22.

Underside. Prosternal process truncate apically, in lateral view rectangular or almost so; declivity flat, with lateral edges sharp and faintly beaded in ventral half. Abdomen entirely beaded on sides, except base of sternite II. Mes- and metepisternum moderately and densely punctate, sides of metaventrite with sparse punctures; abdominal sternites II– IV laterally with a few clusters of fine and dense punctures.

Legs: metatibia externally glabrous; mesotarsomeres 1–2 sulcate on each side of a conspicuous outer carina, metatarsomeres 1–3 similarly sculptured except that the carina is blunt.

Aedeagus ( Figs 33–38 ): median lobe with apex triangular and slightly pointed, without right dorso-apical tooth. Right paramere crescent and fairly long. Everted and inflated internal sac: left preapical bulb ( PBL) entire, lv3 missing; right preapical bulb ( PBR) rather small and set perpendicular to median lobe in dorsal view. Two apical vesicles present, small av1 and av2+av3.

DISTRIBUTION. Only known from the type locality.

HABITATS AND HABITS. Both specimens were collected by pitfall traps in a monsoon broad-leaved forest.

NAME. Patronymic, given after my good friend and colleague, chief of the Joint Russia-Vietnam Tropical Centre, botanist Dr. Andrei Kuznetsov.

Figures

Figs 23–29. Aedeagus of Pterostichus spp.: 23, 26 — P. (Steropanus) fossifrons sp.n.; 24, 27 — P. (S.) securipenis sp.n. (apical margin slightly damaged); 25, 28 — P. (S.) pseudoglymmiger sp.n., median lobe with everted and inflated internal sac; 29 — P. (Vietosteropus) kuznetsovi sp.n.; 23–25 — median lobe, ventral aspect; 26–28 — inside of right paramere. Scale bars: 1 mm. Рис. 23–29. Эдеагус Pterostichus spp.: 23, 26 — P. (Steropanus) fossifrons sp.n.; 24, 27 — P. (S.) securipenis sp.n. (апикальный край слегка обломан); 25, 28 — P. (S.) pseudoglymmiger sp.n., среднЯЯ долЯ с вывернутым и раЗдутым внутренним меШком; 29 — P. (Vietosteropus) kuznetsovi sp.n.; 23–25 — среднЯЯ долЯ? вентрально; 26–28 — праваЯ парамера, иЗнутри. МасШтаб: 1 мм.

Figs 30–32. Dorsal habitus, holotypes: 30 — Pterostichus (Vietosteropus) kuznetsovi sp.n.; 31 — Trigonaptus inaequalis gen. et sp.n.; 32 — T. longiscapus sp.n. Рис. 30–32. Габитус дорЗально, голотипы: 30 — Pterostichus (Vietosteropus) kuznetsovi sp.n.; 31 — Trigonaptus inaequalis gen. et sp.n.; 32 — T. longiscapus sp.n.

Figs 33–38. Aedeagus of Pterostichus (Vietosteropus) kuznetsovi sp.n.: 33–35 — median lobe; 36–38 — median lobe with everted and inflated internal sac; 33, 37 — left lateral aspect; 34, 38 — right lateral aspect; 35–36 — dorsal aspect; av1, av2+3 — apical vesicles; PBL — left preapical bulb; PBR — right preapical bulb. Scale bars: 1 mm. Рис. 33–38. Эдеагус Pterostichus (Vietosteropus) kuznetsovi sp.n.: 33–35 — среднЯЯ долЯ; 36–38 — среднЯЯ долЯ с вывернутым и раЗдутым внутренним меШком; 33, 37 — слева; 34, 38 — справа; 35–36 — дорЗально; av1, av2+3 — апикальные пуЗырьки; PBL — левый предверШинный пуЗырь; PBR — правый предверШинный пуЗырь. МасШтаб: 1 мм.