Pterostichus laevistriatus, 2023

Fedorenko, D. N., 2023, A review of Pterostichus subgenus Orientostichus (Coleoptera: Carabidae: Pterostichini) from Indochina, with description of new species, Russian Entomological Journal 32 (2), pp. 155-170 : 168-170

7. Pterostichus (Orientostichus)

laevistriatus Fedorenko , sp.n.

Figs 8 , 56–57, 60 .

MATERIAL. Holotype ♀ ( ZMMU), labelled: ‘N-Vietnam, 40 km W of/ Cao Bang, Phia Oac Mt. / 22°36´30´´N / 105°52´20´´E, h~ 1 4 50 m,/ deciduous forest, 3–11.X./ leg. D. Fedorenko 2018’.

DIAGNOSIS. A large-sized species of the lesticoides - group, distinctive in having the elytra with single discal seta d3 each; elytral microsculpture consisting of very transverse meshes, with admixture of few moderately transverse ones here and there; reflexed lateral margin with a long, fine and blunt, carina in apical half.

DESCRIPTION. No differences from P. lesticoides other than as follows: BL 23 mm. Body ( Fig. 8 ) shiny black, elytra without iridescence.

Head: Frontal sulci impunctate, slightly diverging, deep before, gradually more shallow behind, almost reaching the level of anterior supra-ocular seta. Frons on each side between eyes with two vague impressions, anterior one in form of oblique line, posterior punctiform. Antennae about reaching pronotal basal margin. AR 1.56: 0.68: 0.90.

Pronotum broadest just medially, PLw/PL 0.50; base wide, without basal bead traceable. Basolateral sulci separate, running parallel to one another, obliterate basally; inner ones fine, moderately deep, slightly crenulate, about as long as basal 2/5 pronotum. Outer sulci two thirds as long, very smooth, wider and more shallow; area between inner and outer sulcus flat and impunctate but one, very fine, puncture at middle. Base faintly and sparsely striated.

Table. Body ratios in species of Pterostichus . Таблица. Индексы пропорций тела видов Pterostichus . Elytra elliptic, apices rounded combined and very slightly blunted. Base slightly oblique. Striae slightly wider, at bottom with microsculpture coarse and very distinct, consisting of longitudinal meshes arranged mostly into 3–4 rows; striae 1–6 inside humeral angle, which is obtuse and blunt. Parascutellar striole missing. Intervals convex, those 7, 5, 3 and 8 confluent apicad in succession separate from the others. Interval 3 with seta d3 adjoining stria 2, D3/EL 0.27–0.30. Stria 7 bisetose at apex, posterior seta at some distance from apex. USS: 27–30. Reflexed lateral margin rather flat, with a fine and nearly flat carina in apical half, indistinctly catenate in front, i.e., broken by very shallow, sparse and uneven, punctures in links; microsculpture superficial isodiametric.

Ventral side smooth, abdominal sternites II–III nearly so, sides of meso- and metathorax moderately punctate. Prosternal process in ventral view rounded apically, not beaded, in lateral view obtuse and blunt; inclination convex, straight in lateral view. Metepisternum short, est3L/W 0.71.

Legs: apical 1/3 fe 2 with three anterodorsal setae, one proximal and two, proximate, distal.

Urites VIII and IX in female as in Figs 56–57, 60 .

DISTRIBUTION. The species is known from the type locality only.

NAME. Refers to the smooth elytral striae.

HABITATS AND HABITS. The only specimen was hand collected in a cloudy forest at 1.450 m altitude.

Figures

Figs 7–9.Dorsal habitus:7 — P. pseudolesticoides sp.n., paratype ♀; 8 — P. laevistriatus sp.n., holotype; 9 — P. tamdaoensis sp.n., holotype. Рис. 7–9. Габитус дорЗально: 7 — P. pseudolesticoides sp.n., paratype ♀; 8 — P. laevistriatus sp.n., голотип; 9 — P. tamdaoensis sp.n., голотип.

Figs 52–60. Abdominal urites VIII–IX and reproductive tract in female: 52–53, 58–59 — Pterostichus prattii; 54–55 — P. matalini sp.n.; 56–57, 60 — P. laevistriatus sp.n.; 52, 54, 56 — tergite VIII; 53, 55, 57 — sternite VIII; 58–60 — urite IX and reproductive tract; 52–58, 60 — ventral aspect; 59 — dorsal aspect; bc — bursa copulatrix; ov — common oviduct; rp — receptacle; sgd — spermathecal gland duct; sc — seminal canal. Scale bars 1 mm. Рис. 52–60. Уриты VIII–IX брюшка и репродуктивный тракт самки: 52–53, 58–59 — Pterostichus prattii; 54–55 — P. matalini sp.n.; 56–57, 60 — P. laevistriatus sp.n.; 52, 54, 56 — тергит VIII; 53, 55, 57 — стернит VIII; 58–60 — урит IX и репродуктивный тракт; 52–58, 60 — вентрально; 59 — дорЗально; bc — копулЯтивнаЯ сумка; ov — непарный Яйцевод; rp — семеприемник; sgd — проток желеЗы сперматеки; sc — семепровод. Масштаб 1 мм.