Trichotichnus (Allotichnus) beroni, Kataev, 2022

Kataev, B. M., 2022, Description of two new subgenera of Trichotichnus, with new brachypterous species from New Guinea and Sumatra (Coleoptera: Carabidae), and notes on three previously described species, Russian Entomological Journal 31 (4), pp. 373-384 : 382-384

Trichotichnus (Allotichnus) beroni Kataev, sp.n.

Figs 17–31 .

MATERIAL. Holotype: ♂, “ Indonesia, Sumatra, Mt. Kerinci / Nat. Park Kerinci — Seblat / Rhododendron forest , 3000–3100 m, / 25.V.1994, P. Beron et V. Beshkov leg.” ( NMNHS). Paratype: ♀, same data as holotype ( NMNHS) .

DESCRIPTION. Body length 5.2–5.5 mm. Habitus as in Figs 17, 20 .

Body brown, with a blackish tint, moderately shiny, not iridescent. Legs blackish brown; palpi and antennae brownish yellow, antennomeres 2–11 partly infuscate.

Head large, in lateral view ( Fig. 20 ) almost as thick as prothorax, in dorsal view ( Fig. 18 ) only slightly narrower than pronotum (HWmax/PWmax0.84–0.88; HWmin/PWmax 0.74– 0.75), impunctate, with small oval depression on frons. Eyes medium sized, weakly convex (HWmax/HWmin 1.13–1.19), in lateral view wide oval, separated from buccal fissure ventrally by distance about half diameter of eye. Genae glabrous. Tempora short, oblique, almost flat, glabrous. Fronto-clypeal suture distinct, shallow, almost straight. Frontal foveae wide, shallow. Fronto-ocular furrows very short and vaguely defined. Supraorbital furrows slightly widened posteriorly. Supraorbital setigerous pores comparatively large,situated slightly behind level of posterior edge of eye and removed from supraorbital furrows by distance slightly less than diameter of eye. Labral apex very weakly concave, almost straight. Clypeus somewhat flat, slightly emarginate along anterior margin, with a pair of setigerous pores each located at anterior angle. Mentum ( Fig. 21 ) completely fused with submentum, with prominent acute median tooth; epilobes very narrow; submentum with one pair of setigerous pores. Ligular sclerite markedly widened apically, with truncate apex and with one pair of ventroapical setae; ventroapical setigerous pores slightly distant from lateral margins of ligular sclerite. Paraglossae narrow apically, slightly longer than ligular sclerite and separated from it by wide (about as wide as paraglossa apically) notches. Penultimate labial palpomere about as long as ultimate palpomere, with two longer and one shorter setae on anterior (inner) margin. Left mandible not elongate, bent apically, with a tip in frontal view narrow, slightly blunted. Dorsal microsculpture distinct throughout, consisting of more or less isodiametric meshes. Antennae pubescent from half of antennomere 3, reaching pronotal basal edge, with antennomeres 5–8 moderately wide, about 1.5 times as long as wide. Basal antennomere slightly longer than antennomere 3.

Pronotum moderately transverse (PWmax/PL 1.27–1.30), widest at end of anterior quarter, approximately equally narrowed apically and basally (PWmax/PWmin-bas 1.27– 1.28; PWmax/PWmin-ap 1.21–1.25), without lateral seta. Sides rounded anteriorly, almost straightly converging behind widest point and slightly sinuate in basal quarter; lateral bead very narrow throughout, reaching basal margin. Apical margin almost straight, very narrowly and finely bordered. Apical angles acutangular, blunted at tip, almost not protrud- ed ahead, without setae. Basal margin more or less straight, about as long as apical margin and markedly shorter than base of elytra between humeral angles, vaguely bordered at a short distance near basal angles. Basal angles obtuse, very narrowly rounded at tip. Disc moderately convex, strongly sloping to apical angles. Lateral gutters narrow apically, slightly widened behind widest point forming basally narrow lateral depressions and fused near basal margin with basal foveae. Basal foveae flat, vaguely outlined; area between them and lateral pronotal edge shallowly depressed; pronotal base flattened medially. Median line fine, not reaching apical margin and vaguely reaching basal margin. Anterior transverse depression wide. Surface basally and in lateral depressions very gently wrinkled. Microsculpture present throughout, distinct, consisting of short transverse meshes.

Elytra moderately convex, slightly flattened on disc along suture and evenly declined to apex, elongate oval (EL/EW 1.45–1.52; EL/PL 2.41–2.57; EW/PWmax 1.30–1.31), widest at middle; sides sinuate before middle. Humeri prominent, angularly rounded, with a tiny acute denticle at tip (in female more distinct than in male). Subapical sinuation shallow. Sutural angle rounded or blunted at tip. Basal edge arched laterally, forming an obtuse angle (internal humeral angle) with lateral margin. Striae fine, crenulate, mostly superficial, slightly impressed apically; striae 6 and 7 not reaching anteriorly basal edge. Intervals somewhat flat, slightly more convex and narrowed apically, impunctate. Stria 1 interrupted basally. Parascutellar (abbreviate) striole short, connected with apical part of stria 1; basal setigerous pore present, comparatively large, slightly distant from basal elytral edge ( Fig. 19 ). Interval 3 without discal setigerous pore. Lateral groove deepened, slightly widened before elytral preapical sinuation, without convexity apically. Marginal umbilicate series interrupted at middle, consisting of 5–7 setigerous pores in basal group and of 7–8 pores in apical group. Microsculpture on intervals distinct throughout, consisting of moderately long transverse meshes.

Wings reduced to small scales.

Thoracic sternites, including prosternum impunctate, prosternum with scattered, very short and fine, barely visible setae. Prosternal process with very short setae, without long setae. Metepisternum ( Fig. 24 ) markedly wider than long, moderately narrowed posteriorly.

Legs relatively short. Metacoxae without additional posteromedial seta. Pro- and mesofemur with one or two setae along lower margin. Metafemur ventrally with two setae at posterior margin and without setae at anterior margin; one short preapical seta on anterior margin. Protibia on dorsal side without longitudinal sulcus, with two or three preapical spines on outer margin. Tarsi glabrous dorsally; tarsomere 5 with two pairs of ventro-lateral setae. Metatarsus short, much shorter than HWmin, with tarsomeres 2–4 markedly widened distally; metatarsomere 1 moderately widened distally, slightly shorter than metatarsomeres 2 and 3 combined; metatarsomeres 1–4 sparsely setose ventrally. Protarsomeres 1–4 and mesotarsomeres 2–4 in male widened and with adhesive biseriate scales ventrally, comparatively short; mesotarsomere 1 short, slightly longer than mesotarsomere 2 and markedly shorter than mesotarsomeres 2 and 3 combined.

Abdominal sternites without additional setae; last visible abdominal sternite (VII) in male ( Fig. 23 ) slightly concave at apex, in female ( Fig. 22 ) rounded, in both sexes with one pairs of marginal setae (these setae not distant from margin).

Female genitalia ( Figs 25–26 ): laterotergite with two strong setae mesoapically; gonosubcoxite elongate, markedly widened apically, with two strong setae on apical margin; gonocoxite with relatively wide base, curved, strongly narrowed apically, about 0.6 times as long as gonosubcoxite, with a short strong seta (spine) on ventral outer edge and with a fine short seta on dorsal outer edge.

Parameres ( Figs 28–29 ) medium sized. Median lobe of aedeagus ( Figs 27, 30 ) slender, in lateral view arcuate along dorsal side basally and almost straight apically, with ventral margin rather convex preapically, and with apex forming a small oblique capitulum protruded dorsally; terminal lamella in dorsal view wide, slightly longer than wide, rounded at sides and apically. Apical orifice in dorsal position, wide apically. Internal sac without spines.

ETYMOLOGY. Named after one of the collectors of this new species, Petar Beron (Sofia), the famous zoologist who made a great contribution to acarology, arachnology, biospeleology, parasitology and zoogeography.

COMPARISON. By its distinctive features, this new species is isolated not only from all the New Guinean Trichotichnus , but also from all other congeners and can be identified by a pronotum without a lateral setigerous pore and by the presence of only one pair of setigerous pores on the apex of the last abdominal sternite of female.

The Australian T. tolgae , which has a somewhat similar habitus and short fronto-ocular furrows, is distinctly different from T. beroni sp.n. in a larger body (length about 7.5 mm) and in having the pronotum with a lateral seta and with a basal margin distinctly bordered along entire length, the elytral interval 3 with a discal setigerous pore, the metasternum and basal abdominal sternite medially with short pubescence, the wings fully developed and the last abdominal sternite of female with two pairs of setae.

DISTRIBUTION ( Fig. 31 ). This new species was found in West Sumatra, Indonesia, on the Mount Kerinci (Kerinci Seblat National Park), at an altitude of about 3000–3100 m in a rhododendron forest .

Notes on three previously described species of Trichotichnus

Figures

Figs 17–20. Trichotichnus (Allotichnus) beroni sp.n.: 17, 19 — general habitus, dorsal and lateral views; 18 — head and pronotum; 20 — elytral base. Scale bars: 1.0 mm. Рис. 17–20. Trichotichnus (Allotichnus) beroni sp.n.: 17, 19 — обЩий вид, сверху и сбоку; 18 — голова и переднеспинка; 20 — основание надкрылий. Масшаб: 1,0 mm.

Figs 21–30. Trichotichnus (Allotichnus) beroni sp.n.: 21 — labium; 22–23 — apex of last abdominal sternite (22 — female, 23 — male); 24 — left metepisternum; 25–26 — female genitalia; 27, 30 — median lobe of aedeagus; 28 — right patramere; 29 — left paramere; 21– 24, 26 — ventral view; 25, 27–29 — lateral; 30 — dorsal view. Scale bars: A = 0.5 mm (21–26), B = 1.0 mm (27–30). Рис. 21–30. Trichotichnus (Allotichnus) beroni sp.n.: 21 — нижнЯЯ губа; 22–23 — вершина последнего брюшного стернита (22 — самка, 23 — самец); 24 — левый метЭпистерн; 25–26 — гениталии самки; 27, 30 — срединнаЯ лопасть Эдеагуса; 28 — праваЯ парамера; 29 — леваЯ парамера; 21–24, 26 — сниЗу; 25, 27–29 — сбоку; 30 — сверху. Масшаб: A = 0,5 mm (21–26), B = 1,0 mm (27–30).

Fig. 31. Map with localities of Trichotichnus spp. Рис. 31. Карта с местами находок Trichotichnus spp.