Coleolissus curtus, 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 : 280-282

Coleolissus curtus sp. n.

( Figs 1–3 , 5–8, 13–15 , 22–24 , 29 )

Type material. Holotype: male, “ CHINA (Yunnan) / Baoshan Prefecture , mount. / range 31 km E Luxi, 2280 m / 24°29′31″N / 98°52′58″E / (secund. pine forest with / old decid. trees, litter sifted) / 3.VI.2007 M. Schülke leg. [19]” (cWR).

Paratypes: 1 male, 1 female, same data as holotype (cWR, ZIN) ; 1 male, same data but A. Pütz leg. [ CH 07+19] (cPTZ) ; 1 male (teneral), “ CHINA (Yunnan) Baoshan Pref. , / Gaoligong Shan, W Pass 35 km / SE Tengchong 2100 m / 24°50′18″N / 98°45′43″E / (devast. prim. dec. forest, / litter sifted) / 25.–28.VIII.2009 D.W. Wrase [06]” (cWR) ; 1 female, “ CHINA: Yunnan [CH07-11A], / Baoshan Pref., Gaoligong Shan, / nr. Xiaoheishan N. R., 35 km SE / Tengchong , 2110 m, / 24°50′16″N, 98°45′43″E, decid. / forest, fungi, sifted, 4. VI.2007, / leg. A. Pütz ” (cWR) .

Description. Body medium-sized for the genus, length 7.2–8.2 mm, width 3.2–3.7 mm (4 males and 2 females measured). Habitus as in Figs. 1–3 .

Body dark brown to black, shiny, iridescent on dorsum, without green or bluish luster; labrum, mandibles partly, very narrow lateral margins of pronotum and lateral furrows of elytra reddish brown; elytral epipleurae reddish brown or blackish brown; palps, antennae and legs yellowish brown; femora and coxae distinctly infuscate (in some specimens tibiae also slightly infuscate).

Head medium-sized (HWmax/PWmax 0.56–0.58, HWmin/PWmax 0.46–0.49), with indistinct micropunctures mostly at base of fronto-ocular furrows. Eyes medium-sized, moderately convex (HWmax/HWmin 1.17–1.22), separated ventrally from buccal fissure at distance about width of antennomere 2 basally. Genae glabrous. Tempora moderately long, slightly convex or almost flat, sloping to neck constriction. Labrum flat, markedly emarginated along anterior margin. Clypeus very slightly convex, shallowly emarginated along anterior margin (labral base slightly visible in the emargination), with fine wrinkles laterally and with one setigerous pore at each outer angle. Fronto-clypeal suture superficial or slightly impressed, 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 slightly before 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 almost parallel-sided, not widened apically, truncate at apex, with blunted outer angles and with 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, narrow, evenly curved apically, with very fine oblique wrinkles in middle portion dorsally; left mandible acute at apex. Dorsal microsculpture highly obliterated, recognizable mostly laterally behind eyes and around posterolateral pores, consisting of a mixture of isodiametric and weakly transverse meshes (more distinct in females than in males). Antennae slender, surpassing pronotal basal edge by approximately one or one and a half apical antennomeres (in female slightly shorter than in male), pubescent from basal third of antennomere 3, with antennomeres 4–8 about 2.0–2.5 times as long as wide and basal antennomere slightly longer than antennomere 3.

Pronotum comparatively large and wide (PWmax/PL 1.47–1.53), widest at the middle, more strongly narrowed apically than basally (PWmax/PWmin-ap 1.55–1.66, PWmax/PWmin-bas 1.19–1.25), 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 markedly emarginate, distinctly narrowly bordered along entire length. Apical angles slightly protruding anteriorly, narrowly rounded at apex. Basal margin almost straight or very shallowly concave in middle portion, slightly rounded laterally, markedly longer than apical margin (PWmin-bas/PWmin-ap 1.24–1.33) and as long as base of elytra between humeral angles; basal border in most specimens obliterated medially and/or at basal angles; basal edge without fringe of short setae. Basal angles widely rounded. Disc convex. Lateral depressions vaguely outlined, beginning from apical angles, shallow and wide, markedly widened basally 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 quite reaching apical and basal margins. Anterior transverse depression shallow and short. Disc finely and irregularly punctate in laterobasal depressions; more sparse punctures also present at basal margin medially and occasionally at anterior margin. Microsculpture very fine, consisting of more or less obliterate isodiametric (at anterior margin) and transverse (on other surface) meshes.

Elytra convex, steeply declined to apex, wide oval (EL/EW 1.30–1.41, EL/PL 2.28–2.44, EW/PWmax 1.12–1.17), widest at middle, roundly narrowed to apex; subapical sinuation very shallow. Humerus angulate, without denticle at apex. Sutural angle sharp or slightly blunted at tip, not extended posteriorly. Basal edge slightly arched, forming an obtuse angle with lateral margin. Striae slightly impressed along entire length. Intervals gradually narrowed in apical half, slightly convex, impunctate. Parascutellar (abbreviate) striole short (in specimens from “ 31 km E Luxi.”) or moderately long (in specimens from “Tengchong”), with a large setigerous pore basally isolated from basal elytral edge. Interval 3 with a series of 6–8 small discal setigerous pores adjoining stria 2 along its entire length; intervals 5 and 7 without discal pores. Marginal umbilicate series with more or less wide gap at the middle, consisting of 8–9 setigerous pores in anterior row and of 10–13 pores in posterior row. Lateral groove narrow throughout. Microsculpture on intervals highly obliterated, consisting of 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 somewhat shallow longitudinal excavation on inner side. Metafemur with two long setae at posterior margin ventrally and with two (in specimens from “ 31 km E Luxi.”) or three (in specimens from “Tengchong”) 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 a pair of scales apically, shorter than (in female about as long as) mesotarsomeres 2 and 3 combined. Metatarsus slender, slightly longer than HWmax, with metatarsomeres 2–4 slightly widened distally; metatarsomere 1 elongate, slightly longer than 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 or slightly concave, in female rounded, in both sexes with two pairs of marginal setae; these setae not distant from margin, or inner pair of setae (in a female from “ 31 km E Luxi.”) slightly distant from margin.

Aedeagus ( Figs. 5–8, 13–15 ) moderately robust, with comparatively large basal bulb and parameres ( Figs. 14, 15 ). Median lobe of aedeagus in lateral view ( Fig. 6, 8 ) arcuate, with ventral margin almost rectilinear or slightly convex in apical half and with apex arcuately bent ventrally ( Figs. 5, 7 ); in dorsal view ( Fig. 13 ) slightly curved; terminal lamella wide, slightly wider than long, rounded at sides and apically. Apical orifice in dorsal position, wide apically. Internal sac with two spiny patches at left side behind the middle (in dorsal view).

Female genitalia ( Figs. 22–24 ). Laterotergite asymmetrical, longer than wide, with narrow basal portion and wider apical portion, without seta. Gonosubcoxite slightly longer than laterotergite, weakly widened posteriorly, without spines. Gonocoxite very narrow, only slightly curved, almost parallel-sided in lateral view, about 0.8 times as long as gonosubcoxite, with very narrow base and with numerous fine short setae almost throughout; foramen in apical position.

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

Comparison. This new species is rather distinct in habitus from other described congeners and can be recognized by a convex and wide medium-sized body with a large oval pronotum combined with a transverse metepisternum. In combination of the morphological features, particularly of male and female genitalia, it is most similar to C. teradai ( Habu, 1978) and some other Oriental species [ C. satoi Ito, 2007 , C. iridipennis Ito, 2008 (non C. iridipennis Ito, 1999 ), C. kiyoyamai Ito, 1987 , C. subcastaneus Ito, 2008 and C. kimanisensis Ito, 2014 ], which all, like C. curtus sp. n., have the elytra not spinous at apex, an arcuate aedeagus with a similar pattern of spiny patches in the internal sac and a very narrow, long and almost straight gonocoxite with apical position of the foramen. All these species, however, distinctly differ from C. curtus sp. n. in having a relatively much smaller pronotum (much shorter and narrower in relation to elytra), an elongate metepisternum (markedly longer than wide), and correspondingly fully developed wings (according to our data, C. iridipennis Ito, 2008 is dimorphic).

Coleolissus yunnanus Ito et Wrase, 2000 from the Chinese provinces of Yunnan and Sichuan is also characterized by a transverse metepisternum and highly reduced wings, but it is easily different from C. curtus sp. n. in many characters, including the following: body larger (11.7–13.2 mm), flatter and more elongate, with bluish tinge; antennae, tibiae and tarsi dark; pronotum narrower, subquadrate, with more narrowly rounded basal angles; gonocoxite with much wider base and with foramen more distant from apex; left mandible blunt.

Distribution. Known from western Yunnan (southern Gaoligong Mountain Range), Baoshan Prefecture, China ( Fig. 29 ). The specimens of this new species have been collected by sifting the forest litter at altitudes of about 2100–2280 m.

Figures

FIGURE 29. Distribution of Coleolissus spp.

FIGURES 1–4. Coleolissus spp., habitus. 1–3, C. curtus sp. n. (1, male, paratype from “31 km E Luxi.”; 2, male, holotype; 3, female, paratype from Tengchong); 4, C. cognatus sp. n. (male, holotype). Scale bars = 5.0 mm.

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 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.