Pterostichus (Vietoderus) laevibasis Fedorenko 2023, sp.n.
Creators: name: Fedorenko, D. N.
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Carabidae
Pterostichus
Pterostichus laevibasis

description: Pterostichus (Vietoderus) laevibasis Fedorenko, sp.n.
Figs 8, 11, 27, 34, 39–40, 49, 58–60, 69–70.
MATERIAL. Holotype ♂ (ZMMU), labelled: ‘N-Vietnam, 40 km W of/ Cao Bang, Phia Oac Mt. / 3-11.X./ 22 °36´50´´N 105°52´0´´E/ h~ 1800 m, deciduous/ ba[m]boo forest, 3-11.X.2018 / leg. D.Fedorenko’. Paratypes (SIEE): ♀, same data, except for 22°36´25´´N 105°52´08´´E / h~ 1650-1700 m,/ deciduous forest, 3- 11./ leg. D. Fedorenko 2018 ’; ♂, same data, except for ‘…/ Cao Bang, Phia Oac Mt. / E-slope, h= 1600-1800 m / 22°36´27´´N 105°52´0´´E / 22.V-6.VI.2018 / leg. A.Abramov’.
Aedeagus examined in the holotype (integuments of aedeagus are soft following slightly teneral condition of the specimen); internal sac examined in the male paratype.
DESCRIPTION. With characters of the subgenus. BL 11.3–12.8 mm. Body (Fig. 8) shiny black, pronotum and elytra slightly iridescent; antennae, palps, ti 1 and tarsi reddish brown, antennae toward apices increasingly pale, red (holotype and female paratype slightly paler coloured, with tarsi red, tibiae reddish brown to red, and reflexed lateral margins of both pronotum and elytra reddish, which is due to somewhat teneral condition; left elytral intervals 1–4 with an occasional, preapical, red patch in the female). Microsculpture isodiametric, superficial yet distinct on head, very superficial on pronotum and elytra, consisting of almost indistinct transverse meshes on the former and very dense transverse lines on the latter; reflexed lateral margin of elytra with very coarse microsculpture, consisting of minute and very dense punctures (apparently formed by isodiametric microgranules fused).
Body otherwise as for P. (Neohaptoderus) austrinus sp.n. except the following characters: frons and vertex slightly flattened, neck constriction indistinct, almost so on sides; frontal sulci narrow, more impressed, and shorter, rather abruptly disappearing before the level of anterior supra-ocular seta.
Pronotum subcircular and rather flat; sides strongly and evenly rounded, broadest just before middle. Base truncate, subsinuate at middle; basal angles very obtuse, blunt or rounded; two basolateral sulci on each side deep, straight, crenulate or with a few fine punctures at bottom, connected by a shallow lateral section of basal bead; inner sulci running parallel to each other on basal two fifths, outher ones about two thirds as long, slightly diverging apicad and slightly separated from lateral grooves; basolateral fovea smooth and flat, barely more convex anteriorly. Apex evenly sinuate between apical angles; these projecting, slightly acute to right, rather sharp or blunted at the very tips; apical bead almost complete, obliterate just medially. Lateral bead fine, lateral groove narrow at apex and at base, slightly broadened in between, as wide as lateral bead at middle, finely and densely punctate in apical three quarters. Median line nearly complete, crenulate, fine yet distinct. Basal and apical transverse impressions indistinct. Each side with a vague sublateral line, indistinct in apical half, very shallow behind and curved toward mid-length of inner basolateral sulcus.
Elytra oblong-oval, nearly parallel-sided in male, slightly more rounded on sides in female, more rounded toward humeri and toward apices; these rounded combined or slightly separate and blunted; preapical sinuation rather shallow, preapical plica traceable in lateral view. Base moderately wide, humeral tooth very minute and invisible in dorsal view; basal ridge straight and transverse, curved laterally to humerus, humeral angle obtuse. Striae deep, finely punctate, those 1–6 or 1–7 inside humeral angle; parascutellar striole very short (short, oblique and almost adjoining stria 1 on left elytron in female paratype). Intervals convex, those 7, 5 and 3 merging preapically in succession; intervals 7 and 8 subequally wide. Discal seta d2 just medial, D2/EL 0.45–0.52 (0.50, n = 3×2). Stria 7 bisetose preapically, with posterior seta adjoining marginal groove (stria 8). USS: 6–1–9.
Ventral side. Propleura finely punctate in inner half, mesepisterna in anterior half, metepisterna and sides of abdominal sternites II–IV moderately and unevenly punctate. Prosternum with indistinct median groove, prosternal process in dorsal view truncate apically, with slight apical bead, in lateral view subrectangular; inclination wide, flat, laterally edged and slightly beaded. Lateral-to-apical abdominal bead entire. Abdominal sternite VII with two apical setae and a large, subtriangular, median tubercle in male (Fig. 11), quadrisetose in female; apical setae in male and inner setae in female about 1/3 sternite length distant from apex.
Legs: tarsomere 5 glabrous ventrally.
Aedeagus (Figs 27, 34, 39–40, 49, 69–70): median lobe in lateral view arcuate; apex in dorsal view fairly long, lamellate, apically rounded, with a small preapical tooth on right side. Right paramere short, triangular, with apex pointed, round or elliptic in cross-section. Everted and inflated internal sac in dorsal view bent to the left and then ventrad, inner curve with six preapical vesicles, which are hypertrophied and merged into a common, large, transverse bulb.
Female urite VIII (Figs 58–59): tergite and sternite wide (long), hemisternite rounded laterally and apically, evenly sclerotized, except for a small, rounded, latero-apical region, basolateral apodemes triangular, wide, slightly longer than wide at bases. Tergite IX (Fig. 60) more or less ground plan; laterotergite rather narrow rounded and setulose at apex; gonocoxite crescent, with apical part elongated, preapical nematiform seta, one inner and two outer ensiform setae in basal two fifths; gonosubcoxite with 2–3, very short, ensiform setae at latero-apical margin. Reproductive tract (Fig. 60): seminal canal at least moderately long (receptacle lost through dissection), with a well-developed basal sclerite and a bulbous structure near its base.
DISTRIBUTION. Known from the type locality only.
NAME. Noun that refers to the smooth base of the pronotum.
HABITATS AND HABITS. All the specimens were collected in cloudy forests.
description: Published as part of Fedorenko, D. N., 2023, New taxa of Pterostichus (Coleoptera: Carabidae) from Vietnam, pp. 16-39 in Russian Entomological Journal 32 (1) on pages 27-28, DOI: 10.15298/rusentj.32.1.03, http://zenodo.org/record/10949096