Labidostomis (Labidostomis) leonardii, Regalin, 2017

Regalin, Renato, 2017, A review of Labidostomis species similar to L. longimana from southeastern Europe with descriptions of two new species from Greece and Turkey (Coleoptera: Chrysomelidae: Cryptocephalinae: Clytrini), Zootaxa 4317 (2), pp. 321-337 : 333-335

Labidostomis (Labidostomis) leonardii sp. nov.

( Figs 10 , 15 , 21 , 27 , 33 , 39 )

Type locality. Greece, Kos Island , Psalidi.

Types examined. Holotype: ♂, “GREECE, Dodekanisou / Kos, Psalidi / 18–23.VI.2007 / R. Regalin leg. [w, p] // Collected on leaf / of Quercus coccifera L. / (frigana vegetation) [g, p]” (MSNM). Paratypes: 55 ♂♂ 30 ♀♀, same label data [w, p]’ (3 ♂♂ 2 ♀♀ in BMNH, 5 ♂♂ 5 ♀♀ in JBCB, 3 ♂♂ 2 ♀♀ in MDCV, 1 ♂ 1 ♀ in MMCM, 3 ♂♂ 2 ♀♀ in NMPC, 37 ♂♂ 16 ♀♀ in RRCA, 3 ♂♂ 2 ♀♀ in SZCM); 1 ♂, “TURKEY centr. / BARLA env. / (BARLA DAGI) / 1993-07-05, Klíma lgt. [w, p]” (FKCC). The specimens are provided with one additional printed red label: “HOLOTYPUS, [or PARATYPUS, respectively], / Labidostomis / leonardii sp. nov., / J. Bezděk & / R. Regalin det., 2017”.

Description. Body length: ♂♂ 5.8–6.3 mm (holotype 6.3 mm); ♀♀ 5.0–6.0 mm.

Male ( Fig. 39 ). Head, pronotum, antennae, legs and ventral side of body metallic blue or bluish-green. Labrum black with yellowish or brownish anterior margin. Ventral sides of antennomeres I–IV pale. Elytra pale brown, with small blurred dark humeral spot.

Head and mandibles distinctly enlarged ( Fig. 27 ). Labrum with medially incised anterior margin, surface lustrous, covered with very fine microsculpture, anterior margin with shorter pale setae, surface with two groups of 5 pores near incision and additional two pores laterally along anterior margin, all pores on suface bear longer pale setae. Clypeus with small triangular processes laterally and slightly convex middle of anterior margin, surface with distinct microsculpture, with 2–3 setigerous pore in at each lateral triangular process. Genae large, subtriangular, with large punctures tending to form wrinkles and with pale setae. Frons wide, 2.63 times as wide as transverse diameter of eye, flat but uneven, distinctly microsculptured and covered with large punctures, laterally tending to wrinkles, punctures bears very short pale setae. Vertex slightly concave, around eyes slightly impressed, in middle with longitudinal impressed line, surface microsculptured and covered with punctures (distinctly smaller than on frons), punctures bear very short pale setae, around eyes with longer setae. Mandibles relatively short and robust, not constricted subapically, inner margin regularly rounded, dorsal keel sharp, moderately rounded and distinctly elevated at basal part, lateral side of left mandible triangular, surface weakly concave, covered with punctures with short pale setae, dorsal margin nearly straight. Antennae short, 0.31 times as long as body, length ratios of antennomeres I–XI equal to 14-5-7-8-10 -8-6-6-6-6-9, antennomere I club-shaped; II subglobular, III elongate, IV elongate, narrow, almost parallel, nearly twice as long as wide, antennae serrated from antennomere V, apex of antennomere XI bidentate ( Fig. 33 ).

Pronotum transverse, 1.70 times as wide as long, widest in middle, strongly convex, lustrous, surface covered with extremely short and fine setae (visible under the magnification 40x), very fine microsculpture; dense large punctures, occasionally mixed with fine smaller punctures. Lateral and posterior margins bordered, anterior margin bordered only in lateral third, border in middle part forms a distinct rounded impression along the margin. One long pale seta placed on lateral margin near posterior corner, additional short setae visible on lateral pronotal margin. Anterior margin moderately concave, lateral margin moderately rounded, posterior margin straight in lateral third and protuberant in scutellar area. Posterior angle nearly rectangular and strongly elevated above elytral base.

Scutellum elongate subtriangular, with widely rounded tip, surface with dense small punctures and very short dense setae, except glabrous and smooth median line, scutellar apex not elevated upon elytral level.

Elytra semicylindrical, parallel, 0.58 as long as body, 1.54 times as long as wide, glabrous, dull, 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 shallowly concave in lateral view.

Protarsi and protibiae prolonged. Protarsi: protarsomere I elongate, subparallel, 2.66 times as long as broad, protarsomeres II subtriangular, 1.80 times as long as broad, length ratios of protarsomeres I–IV equal to 12-9-7-8. Claws simple.

Male genitalia. Aedeagus ( Fig. 10 ) apical quarter convergent with distinctly concave margin, apex subtriangular with rounded tip. Dorsal median impression without median keel, posterior margin deeply incised. Apex of aedeagus without inward crooked folds. Operculum trapezoidal with anterior margin moderately rounded and slightly emarginated in middle. Only triangular sharp median process visible from anterior sclerite. Ventral side of aedeagus with large regular hump and subapically with two impressions.

Everted aedeagus ( Fig. 21 ). Ejaculatory guide ring-like, with thin median process directed upwards, in lateral view with two arms coiled backward. Lateral sclerites transverse, basally wider, constricted in middle, apices long and hook-like. Anterior sclerite forming two concave plates connected in basal suture, in lateral view subtriangular.

Female. Humeral spot is slightly larger and darker than in males. Head, mandibles and anterior legs not enlarged. Frons wider, 3.66 times as wide as transverse diameter of eye. Pronotum more transverse, 1.84 times as wide as long. Protarsi much shorter and narrower than in males, length ratios of protarsomeres I–IV equal to 7-5-5- 8. Spermatheca ( Fig. 15 ). Vasculum widely C-shaped with bent extreme apex, basal part only slightly wider than apical half. Bulbus widely elongate with small spherical glandular insertion. Ductus spermathecae very short, ca 1.2 times longer than vasculum, straight, without any coils or loops.

Variability. Most of males have more or less distinct small blurred dark humeral spot on elytra which can be rarely absent.

Differential diagnosis. Labidostomis leonardii sp. nov. differs from all here treated species by narrow, almost parallel antennomere IV which is elongate subtriangular in L. balcanica , L. graeca , L. tymphristica and L. daccordii sp. nov, or subparallel but wide in L. longimana . Aedeagus of L. leonardii sp. nov. have large hump on ventral side, well visible mainly in lateral view ( Fig. 10 ). Such hump is absent in other species. Pronotum is covered with very short pubescence, which is, however presented also in other here treated species, but much worse visible than in L. leonardii sp. nov. Most similar species is L. balcanica , because both species have mandibles with sharp dorsal keel distinctly elevated in basal half, aedeagus with a pair of shallow subapical impressions ventrally, and similar structure of aedeagus with ductus spermathecae short and straight. However, both species differs easily in the structure of antennomere IV which is almost parallel in L. leonardii sp. nov. but subtriangular in L. balcanica , males with dark humeral spot on elytra in in L. leonardii sp. nov. but elytra completely pale in males of L. balcanica , and mandibles not constricted subapically with inner margin regularly rounded in L. leonardii sp. nov. while mandibles distinctly constricted subapically with sharp inner angle in L. balcanica . The females L. leonardii sp. nov. has large elongate spermathecal bulbus missing in other species.

Distribution. Greece: Kos Is. ( Dodecanese islans), Turkey: Isparta prov.

Etymology. Named by our friend and colleague Carlo Leonardi (Milan, Italy), eminent Alticini specialist. Host plants. All the specimens in the Kos Island were collected on the young leaves of Quercus coccifera L. on a large bush isolated on the edge of a partly cultivated meadow.

Figures

FIGURES 9 – 10. Aedeagus in dorsal, lateral and ventral views. 9 — Labidostomis daccordii sp. nov.; 10 — L. leonardii sp. nov. Scale bar: 0.5 mm.

FIGURES 11 – 15. Spermatheca. 11 — Labidostomis balcanica; 12 — L. longimana; 13 — L. tymphristica; 14 — L. daccordii sp. nov.; 15 — L. leonardii sp. nov. Scale bar: 0.25 mm.

FIGURES 19 – 21. Aedeagus with everted internal sac. 19 — Labidostomis tymphristica; 20 — L. daccordii sp. nov.; 21 — L. leonardii sp. nov. Not to scale.

FIGURES 22 – 27. Head and mandibles in frontal view. 22 — Labidostomis balcanica; 23 — L. graeca; 24 — L. longimana; 25 — L. tymphristica; 26 — L. daccordii sp. nov.; 27 — L. leonardii sp. nov. Not to scale.

FIGURES 28 – 33. Right male antenna. 28 — Labidostomis balcanica; 29 — L. graeca; 30 — L. longimana; 31 — L. tymphristica; 32 — L. daccordii sp. nov.; 33 — L. leonardii sp. nov. Not to scale.

FIGURES 34 – 39. Male habitus. 34 — Labidostomis balcanica (holotype, 7.6 mm); 35 — L. graeca (holotype, 6.7 mm); 36 — L. longimana (Bulgaria, 5.8 mm); 37 — L. tymphristica (holotype, 5.9 mm); 38 — L. daccordii sp. nov. (paratype, 6.5 mm); 39 — L. leonardii sp. nov. (holotype, 6.3 mm).