Labidostomis (Labidostomis) regalini, Bezděk, 2018

Bezděk, Jan, 2018, Revision of Labidostomis (Coleoptera: Chrysomelidae: Cryptocephalinae: Clytrini) with large united elytral spot from Iran and adjacent countries, Zootaxa 4457 (4), pp. 501-519 : 513-516

Labidostomis (Labidostomis) regalini sp. nov.

( Figs 6 , 12 , 18 , 25 , 41–42 )

Type locality. Turkey, Adiyaman, Nemrut Dag.

Types examined. Holotype: ♂, “ TURKEY mer. / NEMRUT DAG / (ADIYAMAN) 9.VI. / leg. Snizek 1996 [w, p]” ( NMPC) . Paratypes: 10 ♂♂ 7 ♀♀, “TR-prov. Adiyaman / Nemrut Daghi / Kahta env., 13.VI. / 1998 J. Voříšek lgt. [w, p]” ( JVCJ, 3 ♂♂ 2 ♀♀ in BMNH, 1 ♂ 1 ♀ in ZMHB) ; 3 ♀♀, “ Tr. —prov. Adiyaman / Nerut Dagi , 13.VI.1998 / KARADUT env. / Z. Košťál + V. Bíža lgt. [w, p]” ( JVCJ) ; 4 ♂♂ 3 ♀♀, “TURCIA CS, Karadut distr.

/ Nemrut Dagi / 26.V.–6.VI.1997 / P. Viktora lgt. [w, p]” (JVCJ); 8 ♂♂ 4 ♀♀, “Turkey / 40 km E Adiyaman / Kahta, 10.6.1998 / Ma. Halada lgt. [w, p]” (JBCB); 1 ♀, “Turkey / 42 km E Adiyaman / Kahta, 10.6.1998 / Ma. Halada lgt. [w, p]” (JBCB); 1 ♂, “Turkey / 43 km E Adiyaman / Kahta, 10.6.1998 / Ma. Halada lgt. [w, p]” (JBCB); 2 ♀♀, “Türkey—Nemrut Dagi / 2.000 m. n. m. / 6.VI.1995 / V. Bíža + Z. Košťál lgt. [w, p]” (JBCB, NMPC); 1 ♂, “SE TURKEY, 9.vi.1996 / Nemrud dag (Adiyaman) / M. Snížek leg. [w, p]” (JBCB); 5 ♂♂, “TURKEY mer. / NEMRUT DAG / (ADIYAMAN) 9.VI. / leg. Snizek 1996 [w, p]” (NMPC); 1 ♂, “TURKEY mer. or. / NEMRUT DAG / (ADIYAMAN) / 9.6.1996 / Lgt. M. SNIZEK [w, p]” (NMPC); 1 ♂, “TURKEY / KARADUT / 26.5.– 5.6.1997 / MORAVEC PETR [w, p]” (NMPC). The specimens are provided with one additional printed red label: “HOLOTYPUS, [or PARATYPUS, respectively], / Labidostomis / regalini sp. nov., / J. Bezděk det., 2018”.

Description. Body length: ♂♂ 4.7–6.0 mm (holotype 5.3 mm); ♀♀ 4.9–5.5 mm.

Male (holotype). Head, pronotum, legs and ventral side of body metallic blue-green. Labrum dark brown with paler anterior margin. Antennae metallic green with antennomere I–IV and base of V yellow. Elytra pale orange, with very small blurred humeral spot, and large discal metallic spot common for both elytra with lateral margins straight and not touching lateral margin of elytra, posterior margin straight and transverse, anterior margin oblique, slightly concave, reaching schutellum ( Fig. 41 ).

Head and mandibles distinctly enlarged ( Fig. 18 ). Labrum with anterior margin concave in middle, surface with two groups of several pores bearing longer pale setae. Clypeus laterally with long processes with parallel inner margins and oblique outer margins, tips shortly rounded. Clypeal margin between processes bisinuate. Clypeal surface covered, with large punctures and distinct microsculpture, processes with sparser punctures. Genae large, subtriangular, with large punctures, microsulpture and with pale setae. Frons wide, glabrous, 3.21 times as wide as transverse diameter of eye, with large round impression covered with large punctures, microsculpture and around perimeter with punctures tending to wrinkles. Vertex moderately concave, around eyes slightly impressed, in middle with longitudinal impressed line, surface lustrous, covered with sparse small punctures and indistinct microsculpture, vertex glabrous except several setae around each eye. Mandibles relatively short and wide, dorsal keels sharp, moderately rounded and distinctly elevated in basal half, inner slopes concave, lateral side of left mandible subtriangular, surface slightly concave, covered with punctures with pale setae, dorsal margin nearly straight. Antennae short, 0.32 times as long as body, length ratios of antennomeres I–XI equal to 22-10-10-14 - 18- 13-12-10 -10-10-16, antennomere I club-shaped; II subglobular, III elongate, IV elongate and slightly widened apically, antennae serrated from antennomere V, apex of antennomere XI concave subapically.

Pronotum transverse, 1.92 times as wide as long, widest in middle, strongly convex, lustrous, surface completely glabrous, covered with very fine microsculpture and irregular punctures slightly larger and deeper in middle of pronotum, smaller and shallower laterally. Lateral and posterior margins bordered, anterior margin bordered only in lateral thirds, border in middle part form distinct rounded impression along the margin. One long pale seta placed near all corners. Anterior margin slightly concave, lateral margins moderately rounded, posterior margin straight in lateral thirds and protuberant in scutellar area. Posterior angles nearly rectangular and elevated above elytral base.

Scutellum elongate subtriangular, with widely rounded tip, surface with dense small punctures laterally, in middle with sparser punctures, lateral and apical margins thinly bordered, scutellar apex slightly elevated.

Elytra semicylindrical, parallel, 0.58 as long as body, 1.32 times as long as wide, glabrous, semiopaque, covered with microsculpture and densely with small confused punctures, elytral apices impunctate. Basal margin with border disappearing near scutellum. Epipleura glabrous, impunctate, wide in humeral area, suddenly disappearing in basal 1/5 of elytral length. Lateral margin of elytra concave in lateral view.

Protarsi and protibiae prolonged. Protarsi: protarsomere I elongate, narrowed in basal half, subparallel in apical half, 2.25 times as long as broad, protarsomeres II subtriangular, 1.44 times as long as broad, length ratios of protarsomeres I–IV equal to 18-13-12-17. Claws narrow, simple, with angulate base.

Aedeagus ( Fig. 6 ) with apical part triangular with straight margins and obtuse tip. Dorsal median impression subtriangular with widely round apex, without visible median keel. Apex of aedeagus without inward triangular crooked folds. Operculum trapezoidal. Non-everted anterior sclerite visible as long thin median process. Ventrally with two long and narrow impressions along very wide obtuse median keel.

Everted aedeagus ( Fig. 25 ). Ejaculatory guide semicircular, forming two dilated round branches, anterior conjunction narrow with rhomboidal process in middle. Lateral sclerites four-sided with posterior angle prolonged. Anterior sclerite moderately large, forming two concave plates connected in basal suture.

Female ( Fig. 24 ). Head, mandibles and anterior legs not enlarged. Humeral spot somewhat larger than in males and not blurred. Frons 3.4–3.5 times as wide as transverse diameter of eye. Pronotum more transverse, ca 2.1 times as wide as long. Protarsi much shorter and narrower than in males, length ratios of protarsomeres I–IV equal to 11- 8-9-12. Spermatheca ( Fig. 12 ). Vasculum with nearly parallel apical part, apex with small appendix, basal part slightly wider. Bulbus small, placed laterally at outer side of basal part of vasculum. Ductus spermathecae three times as long as vasculum, with several simple loops in whole lenght, basal part of ductus slightly wider.

Variability. Some specimens have completely black labrum.

Differential diagnosis. The males of Labidostomis regalini sp. nov. have relatively long clypeal processes resembling that of L. luristanica and L. shirazica but inner sides of processes in L. shirazica are distinctly convergent. The mandibles of males of L. regalini sp. nov. are somewhat wider than in L. luristanica and L. shirazica . The males of L. elegans has shorter and triangular clypeal processes and mandibles with medially placed dorsal keels. The males of L. kantneri and L. limbata has much wider clypeal processes (cf. Figs 13–18 ). All six species differ also in the structure of ejaculatory guide (see Figs 19–25 ).

Ductus spermathecae of Labidostomis regalini sp. nov. is three times as long as vasculum, with several simple loops in whole lenght ( Fig. 12 ), in comparison with much longer ductus in L. luristanica and L. elegans ( Figs 7, 10 ), shorter and straight ductus without any coils in L. shirazica ( Fig. 11 ), and shorter ductus twice as long as vasculum in L. limbata ( Fig. 9 ). Only females of L. kantneri have similar ductus spermathecae to L. regalini sp. nov. (compare Figs 8, 12 ).

Distribution. Turkey (Adiyaman prov.).

Etymology. Dedicated in memory to late Renato Regalin (1961–2016), an excellent specialist in Clytrini .

Figures

FIGURES 1–6. Aedeagus in dorsal, lateral and ventral views (as—anterior sclerite, op—operculum, di—dorsal impression). 1—Labidostomis elegans; 2—L. kantneri; 3—L. limbata; 4—L. luristanica; 5—L. shirazica; 6—L. regalini sp. nov. Scale bar: 0.5 mm.

FIGURES 7–12. Spermatheca. 7—Labidostomis elegans; 8—L. kantneri; 9—L. limbata; 10—L. luristanica; 11—L. shirazica; 12—L. regalini sp. nov. Scale bar: 0.5 mm.

FIGURES 13–18. Male mandibles and clypeal processes. 13—Labidostomis elegans; 14—L. kantneri; 15—L. limbata; 16— L. luristanica; 17—L. shirazica; 18—L. regalini sp. nov. Scale bar: 0.5 mm.

FIGURES 22–25. Aedeagus with everted internal sac and ejaculatory guide in different views. 22—Labidostomis luristanica; 23—L. luristanica (specimen from Zanjan prov.); 24—L. shirazica; 25—L. regalini sp. nov. Not to scale.

FIGURES 38–42. Habitus. 38—Labidostomis shirazica (male, 5.1 mm); 39—L. shirazica (female, 5.2 mm); 40—L. shirazica (holotype, male, 5.5 mm); 41—L. regalini sp. nov. (paratype, male, 6.1 mm); 42—L. regalini sp. nov. (paratype, female, 5.4 mm).

FIGURES 19–21. Aedeagus with everted internal sac and ejaculatory guide in different views (eg—ejaculatory guide, lslateral sclerites, as—anterior sclerite). 19—Labidostomis elegans; 20—L. kantneri; 21—L. limbata. Not to scale.