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

description: Pterostichus (Neohaptoderus) austrinus Fedorenko, sp.n.
Figs 7, 10, 18–19, 25, 28–29, 37–38, 46, 52–53, 61, 63.
MATERIAL. Holotype ♂ (ZMMU), labelled: ‘N-Vietnam, 40 km W of/ Cao Bang, Phia Oac Mt. / 22°36´25´´N 105°52´08´´E / h~ 1650-1700 m,/ deciduous forest, 3- 11.X. / leg.D. Fedorenko 2018 ’. Paratypes (SIEE): 6♂♂, 6♀♀, same data, except for 22°36´30´´N 105°52´20´´E / h~ 1600-1650 m; 6♂♂, 5♀♀, same label, except for ‘…/ 22°36´50´´N 105°52´0´´E / h~ 1800 m, deciduous/ ba[m]boo forest, 3-11.X.2018 / leg. D.Fedorenko’.
DIAGNOSIS. The new species is distinctive in having the body rather robust, the pronotum quadrate and impunctate, with two, well-developed, separate basolateral sulci on each side; elytron with two discal setae, d2 and d3, striae deep and very finely punctate, and intervals convex. Besides, apical seta of fe 1 posterior face mostly missing.
DESCRIPTION. With characters of the subgenus. BL 10.9– 12 mm. Body (Fig. 7) apterous, shiny black, elytra slightly iridescent. Tarsi, palps and antennae more or less reddish, elytra slightly reddish at apices. Head and pronotum with a distinct microsculpture consisting of isodiametric or moderately transverse meshes, respectively; elytral microsculpture consisting of very dense transverse lines. Head and pronotum microscopically and rather densely punctate, elytra sparsely and almost indistinctly punctate.
Head with neck constriction shallow and traceable on sides only. Eyes convex, medium-sized, genae about a third as long, meeting neck at obtuse angle. Frons smooth, frontal sulci smooth, moderately deep, diverging, barely surpassing the level of anterior supra-ocular seta, not anteriorly extended onto clypeus. Labrum quadrate. Mandibular scrobe longitudinally sulcate, dorsolateral ridge indistinctly sinuate, dorsal side obliquely striated. Antennae reaching pronotal base.
Pronotum quadrate, broadest just in front of middle; sides slightly rounded and minutely to indistinctly indented just in front of basal angles; these obtuse, with a very blunt, subtle to indistinct, denticle. Base a third wider than apex, subtruncate, slightly sinuate in middle third, and impunctate, with two well-impressed sulci on each side, both not reaching basal margin; inner sulci running on basal two fifth nearly parallel to each other, outer ones about half as long or still shorter; basal bead missing or vestigial and hardly traceable between bases of inner and outer sulci. Apex subtruncate at middle to rather deeply and evenly sinuate between apical angles; these sharp, right or very slightly acute, slightly to distinctly projecting. Marginal beads fine, lateral bead just reaching basal angle, apical bead from entire to obliterate in middle fifth. Lateral groove fine, minutely yet densely punctate at bottom. Disc smooth, except for very superficial rugosities; a fine sublateral line on each side, curved toward mid-length of inner basolateral sulcus and slightly deeper in basal half, running parallel to lateral margin and nearly indistinct in apical half. Median line fine yet distinct, slightly crenulate. Basal and apical transverse impressions indistinct.
Elytra elliptic, broadest at about middle, apices rounded combined, preapical sinuation shallow, with internal plica almost indistinct. Base slightly oblique, humeri toothed; basal ridge transverse and nearly straight, humeral angle subrectangular. Striae deep, very finely punctate, stria 7 mostly opposite humeral angle; parascutellar striole short or very short (i.e., secondary, represented by a vestige of stria 1 that adjoins parascutellar seta while primary parascutellar striole substituted for primary base of stria 1), sometimes missing; parascutellar seta just inside stria 2. Intervals convex, very so toward apex, those 7, 5 and 3 confluent apicad in succession, intervals 7 and 8 subequally wide. Reflexed lateral margin narrow, without additional carinae. Interval 3 with two discal setae in stria 2, d2, just behind middle, D2/EL 0.46–0.60 (0.54, n = 8×2), stria 7 with two preapical setae. USS: 16–18, mostly arranged into a row 6–1–9 or 6-1-1-8.
Underside: Prosternum with a shallow median groove in front of procoxae; prosternal process apically beaded; inclination subconvex, wide, with blunt lateral edges. Sides of metathorax and abdominal sternites II–VI along sides densely, moderately to rather finely, punctate; mesothorax and propleura very shallowly and more sparsely punctate to nearly smooth. Abdominal lateral bead entire. Sternite VII bi- to quadrisetose in female, with setae proximate to apical bead; slightly modified in male (Fig. 10) so that a shallow round impression runs on apical three fifths, with granulate microsculpture and a fine median carina at its bottom; the carina raised medially in form of a small tubercle, being vague before, more distinct behind; two apical setae about 1.5 width of apical bead distant from apical margin.
Legs: ti 2 with 3–4 lateral setae, ti 3 with single, preapical, lateral seta; tarsomere 5 glabrous ventrally. Protarsomere 1 sparsely setulose at anterior (inner) margin. Specimens with apical seta of fe 1 posterior face either present or absent from one or both sides are in the ratio 5: 5: 14, respectively.
Aedeagus (Figs 18–19, 25, 28–29, 37–38, 46): Median lobe in lateral view strongly curved, apex in dorsal view rounded, slightly triangular and very short. Right paramere long, narrow, strongly arcuate, apical half being at a slightly acute angle to basal half. Everted and inflated internal sac rather simple, with a small preapical sclerite and a large apical one on left or right side, respectively.
Female urite VIII just as for the genus (Figs 52–53). Tergite IX (Fig. 61) of ground plan structure: gonocoxite crescent, with apex pointed, preapical nematiform seta, one inner and two outer ensiform setae; gonosubcoxite with a few ensiform setae at latero-apical margin. Reproductive tract (Fig. 63): seminal canal fairly short; receptacle more or less c-shaped.
DISTRIBUTION. Known from the type locality only.
NAME. Refers to the species range, which is southernmost for the subgenus.
HABITATS AND HABITS. Most specimens were collected by pitfall traps in a broad-leaved forest at 1.600 m or in a deciduous and bamboo forest at 1.800 m altitude.
COMMENTS. Individual variations include the anterior elytral seta, d1, additionally present on one or both elytra in four or two specimens, respectively. This species also reveals a tendency for the inner apical setae of the abdominal sternite VII to disappear so that the examined female specimens with two or three, or four setae are in the ratio 3: 5: 3, respectively.
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 page 24, DOI: 10.15298/rusentj.32.1.03, http://zenodo.org/record/10949096