Coleolissus brevis, Kataev & Wrase, 2023

Kataev, Boris M. & Wrase, David W., 2023, Three new brachypterous species of the genus Coleolissus (Coleoptera: Carabidae) from China and India, Zootaxa 5227 (2), pp. 279-289 : 284-287

Coleolissus brevis sp. n.

( Figs 11, 12, 19–21 , 27–29 )

Type material. Holotype: male, “north INDIA-west SIKKIM / Khecheoparin [=? Khecheopalri ] lake / (1800 m.m.) 4– 10.6.1999 / lgt. E. Kučera ” (cWR).

Paratypes: 1 male, 1 female, same data as holotype (cWR, ZIN) .

Description. Body medium-sized for the genus, length 9.2–9.7 mm, width 3.9–4.2 mm.Habitus as in Figs. 27, 28 .

Body black, shiny, iridescent, with green luster on dorsum; labrum, mandibles, lateral beads of pronotum and lateral furrows of elytra dark reddish brown; elytral epipleurae blackish brown; palps, antennae and legs yellowish brown; femora and coxae more or less infuscate.

Head medium-sized(HWmax/PWmax 0.56–0.57, HWmin/PWmax 0.45–0.48), impunctate.Eyes medium-sized, moderately convex (HWmax/HWmin 1.17–1.24), separated ventrally from buccal fissure at distance about width of antennomere 2 apically. Genae glabrous. Tempora moderately long, slightly convex, sloping to neck constriction. Labrum flat, markedly emarginate along anterior margin. Clypeus very slightly convex, almost straight or very shallowly emarginate along anterior margin, with one setigerous pore at each outer angle. Fronto-clypeal suture fine, almost straight. Fronto-ocular furrows distinct, reaching supraorbital furrows, markedly deepened at clypeus. Supraorbital furrows very narrow, touching upper margin of eyes. Supraorbital setigerous pores small, situated at level of posterior margin of eyes and removed from supraorbital furrows by distance of about width of antennomere 1 basally. Mentum separated from submentum by complete transverse suture, with a prominent median tooth; epilobes moderately widened apically; submentum with one pair of long lateral setae. Ligular sclerite moderately widened distally, with rounded outer angles and one pair of ventroapical setae. Paraglossae glabrous, narrow, markedly projecting beyond ligular sclerite and separated from it apically. Basal labial palpomere not carinate; penultimate labial palpomere slightly longer than apical one. Mandibles elongate, somewhat narrow, evenly curved apically, without wrinkles dorsally; left mandible acute at apex. Dorsal microsculpture distinct throughout, consisting of isodiametric meshes. Antennae slender, surpassing pronotal basal edge by approximately two apical antennomeres (in female slightly shorter than in male), pubescent from the middle of antennomere 3, with antennomeres 4–8 about 2.5–3.0 times as long as wide and basal antennomere about as long as antennomere 3.

Pronotum comparatively large and wide (PWmax/PL 1.51–1.53), widest just behind the middle, much more strongly narrowed apically than basally (PWmax/PWmin-ap 1.62–1.69, PWmax/PWmin-bas 1.15–1.22), with one lateral seta inserted in the end of apical third. Sides evenly rounded along entire length; lateral bead complete, very narrow throughout. Apical margin moderately emarginate, narrowly bordered along entire length. Apical angles slightly protruding anteriorly, narrowly rounded at apex. Basal margin slightly rectilinearly concave in middle portion, slightly rounded laterally, bordered almost along entire length (basal bead obliterated medially and occasionally at basal angles), much longer than apical margin (PWmin-bas/PWmin-ap 1.34–1.48) and as long as base of elytra between humeral angles; basal edge without fringe of short setae. Basal angles widely rounded. Disc convex. Lateral depressions vaguely outlined, beginning from apical angles or lateral setae, very shallow, wide, markedly widened posteriorly and fused with wide and shallow basal foveae forming oblique laterobasal depressions isolated from each other by a convex area. Median line fine, superficial, not reaching apical and basal margins. Anterior transverse depression very shallow and short. Disc finely and irregularly punctate in laterobasal depressions, with very fine scattered punctures at basal margin medially. Microsculpture visible throughout, consisting of fine transverse meshes.

Elytra convex, steeply declined to apex, wide oval (EL/EW 1.43–1.48, EL/PL 2.45–2.53, EW/PWmax 1.12– 1.13), widest at the middle, comparatively strongly narrowed to apex; subapical sinuation very shallow. Humerus angulate, with small acute denticle at apex. Sutural angle blunted or narrowly rounded at tip, not extended posteriorly. Basal edge slightly arched, forming an almost right angle with lateral margin. Striae very fine, superficial, slightly impressed just at apex. Intervals wide on disc, evenly narrowed apically, mainly flat, slightly convex before apex, impunctate. Parascutellar (abbreviate) striole moderately long, with a large setigerous pore basally isolated from basal elytral edge. Interval 3 with a series of 5–7 small discal setigerous pores mostly adjoining stria 2 along its entire length; intervals 5 and 7 without discal pores. Marginal umbilicate series with more or less wide gap at middle, consisting of 8–9 setigerous pores in anterior row and of 11–12 pores in posterior row. Lateral groove very narrow throughout, slightly narrower than in C. curtus sp. n. and C. cognatus sp. n. Microsculpture on intervals highly obliterated, at most with indistinct transverse lines.

Wings reduced to a tiny scale.

Pro- and metasternum with very fine and short setae. Metepisternum short, wider than long, weakly narrowed posteriorly.

Metacoxa with two obligatory setigerous pores, without additional pores and setae. Profemur with shallow longitudinal excavation on inner side. Metafemur with two long setae at posterior margin ventrally and with two short setae on anterior margin. Protibia without longitudinal sulcus on dorsal side, with one stouter and one thinner spine in male and with three comparatively stout, similar sized spines in female. Tarsi glabrous dorsally. In male, protarsomeres 1–4 and mesotarsomeres 2–4 moderately widened, with biseriate adhesive scales ventrally; mesotarsomere 1 weakly widened, with scales only apically, shorter than (in female about as long as) mesotarsomeres 2 and 3 combined. Metatarsus slender, markedly longer than HWmax, with metatarsomeres 2–4 slightly widened distally; metatarsomere 1 elongate, about as long as metatarsomeres 2–3 combined. Tarsomere 5 with two pairs of ventro-lateral setae.

Abdominal sternites glabrous, only with obligatory setae; apex of last visible sternite (VII) in male subtruncate, in female rounded, in both sexes with two pairs of marginal setae; these setae not distant from margin.

Aedeagus ( Figs. 11, 12, 19–21 ) moderately robust, with basal bulb and parameres comparatively large ( Figs. 20, 21 ). Median lobe of aedeagus in lateral view ( Fig. 12 ) arcuate, with ventral margin slightly convex in apical quarter and with apex slightly swollen ( Fig. 11 ); in dorsal view ( Fig. 19 ) slightly curved; terminal lamella wide, slightly wider than long, rounded apically. Apical orifice in dorsal position, wide apically. Internal sac with large longitudinal spiny patches at left side medially (in dorsal view).

Female genitalia ( Figs. 25, 26 ). Laterotergite asymmetrical, longer than wide, with membranous apical portion and with one preapical seta. Gonosubcoxite about as long as laterotergite, markedly widened posteriorly, without spines. Gonocoxite narrow, slightly curved, narrowed apically, about 0.8 times as long as gonosubcoxite, with very narrow base and with several fine short setae (spines) on outer side; foramen very close to apex.

Etymology. The specific name is a Latin adjective meaning “wide” and referring to the wide and short body of the new species.

Comparison. In its general habitus and morphology, including the short, transverse metepisternum, this new species is very similar to the two preceding species, C. curtus sp. n. and C. cognatus sp. n., but can be distinguished from them by having a slightly larger body size, a green luster on dorsum, a more distinct microsculpture on head and pronotum, the humerus with a denticle at apex, the elytral striae finer, superficial, intervals flat, the lateral furrow narrower, and the apex of median lobe of aedeagus only swollen, not bent dorsally. It additionally differs from C. curtus sp. n. in having a less convex body, the pronotum widest behind the middle, and the female genitalia with a wider basal portion of the laterotergite and with a more markedly curved and apically narrowed gonocoxite (a female of C. cognatus sp. n. is unknown). Coleolissus brevis sp. n. additionally differs from C. cognatus sp. n. in the pronotum with a shallower emargination of the apical margin, less protruding apical angles and with shallower and more finely punctate lateral depressions; besides, its eyes are less convex and the elytra are narrower.

Coleolissus nakajimai Ito, 2016 , which was described from one female from the Indian state of Tamil Nadu and known to us only from the original description ( Ito 2016), also has vestigial wings, a pronotum with rounded sides and widely rounded basal angles, as well as oval elytra, but it is distinguished from C. brevis sp. n. at least by having a larger and more elongate body (length 12.5 mm), the elytral intervals convex, the laterotergite with two setae at apex, the gonosubcoxite with one long seta, and the gonocoxite clearly curved, without spines or seta on the outer side and with a foramen on the inner side slightly apart from the tip.

Distribution. Known only from the type locality [“Khecheoparin” (=? Khecheopalri) Lake, 1800 m] in Sikkim State, India ( Fig. 29 ).

Figures

FIGURE 29. Distribution of Coleolissus spp.

FIGURES 5–21. Coleolissus spp., male genitalia. 5–8, 13–15, C. curtus sp. n. (5, 6, holotype; 7, 8, 13–15, paratypes from “31 km E Luxi.”); 9, 10, 16–18, C. cognatus sp. n. (holotype); 11, 12, 19–21, C. brevis sp. n. (holotype). 5, 7, 9, 11, apex of median lobe of aedeagus; 6, 8, 10, 12, 13, 16, 19, median lobe; 14, 17, 20, right paramere; 15, 18, 21, left paramere. Left lateral (5–12, 14, 17, 20), dorsal (13, 16, 19), and right lateral (15, 18, 21) views. Scale bars: A = 0.5 mm (5, 7, 9, 11), B = 1.0 mm (6, 8, 10, 12, 13–21).

FIGURES 27, 28. Coleolissus brevis sp. n., habitus, paratypes. 27, male; 28, female, paratype. Scale bars = 5.0 mm.

FIGURES 22–26. Coleolissus spp., female genitalia, paratypes. 22–24, C. curtus sp. n. (22, Tengchong; 23, 24, “31 km E Luxi.”); 25, 26, C. brevis sp. n. 22, 24, 26, laterotergite, gonosubcoxite, and gonocoxite (ventral view); 23, 25, gonocoxite (lateral view). Scale bar = 0.5 mm.