Labidostomis (Labidostomis) tymphristica Tomov, 1990

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 : 328

Labidostomis (Labidostomis) tymphristica Tomov, 1990

( Figs 8 , 13 , 19 , 25 , 31 , 37 )

Labidostomis tymphristica Tomov, 1990: 135 (original description).

Type locality. “Graecia: Tymphristo”.

Types examined. Holotype ( Fig. 37 ): ♂, “GRECIA-Tymphristo / 2000 m 8.VII.82 / M. & G. Osella [w, p] // Holotypus [r, p] // Labidostomis / tymphristica sp. n. / V. Tomov det. 1988 [w, p]” (MSNV). Paratypes: 1 ♀, same labels except “Paratypus [r, p]” (MSNV); 1 ♂, “Grecia Tymphristo / 2000m, 8.7.1982 / M. & G. Osella [w, p] // Paratypus [r, p] // Labidostomis / tymphristica sp. n. / V. Tomov det. 1988 [w, p]” (MSNV).

Additional specimens examined. 6 specimens — GREECE: Central Greece: Evrytania, Kaliakouda Mts. , Aniada env., 1200 m, 27.vi.2006, 1 ♂ , S. Benedikt leg. ( FKCC). Epirus: Arta, Kakardhitsa Mt. , 1200–1800 m, 9.vii.2006, 1 ♂ 1 ♀ , M. Montagna & R. Regalin leg. ( RRCA); Arta, Kakardhitsa Mt. , 1590 m, 9.vii.2006, on Rumex sp., 1 ♂ , R. Regalin leg. ( RRCA); Arta, Kakardhitsa Mt. , 1620–1800 m, 9.vii.2006, on Trifolium sp., 1 ♂ , R. Regalin leg. ( RRCA); Arta, Tzoumerka Mt. , 1540 m, 8.vii.2006, on Trifolium sp., 1 ♂ , R. Regalin leg. (RRCA).

Additions to description. Body length: ♂♂ 5.0– 6.8 mm (holotype 5.8 mm); ♀♀ 4.6–6.1 mm.

Colouration. Labrum dark with paler margins. Elytra with small blurred dark spot on humerus.

Mandibles ( Fig. 25 ). Mandibles small, of the same width across the whole length, with dorsal keel distinct but not elevated. Inner slopes wide, slightly concave with inner surface nearly horizontal, the angle between lateral and apical parts of inner margins rounded, about 110°.

Antennae ( Fig. 31 ). Antennomere IV subtriangular, 1.3 times as long as wide.

Aedeagus ( Fig. 8 ). Apical quarter convergent with slightly concave margins, apex subtriangular. Dorsal median impression semi-elliptical, posterior margin deeply incised, with well-developed median keel. Apex of aedeagus without inward crooked folds. Operculum trapezoidal with anterior margin shallowly emarginated in middle. Visible part of non-everted anterior sclerite transverse, very thin, with triangular sharp median process. In lateral view, ventral side of aedeagus moderately convex.

Everted aedeagus ( Fig. 19 ). Ejaculatory guide with large rounded lateral arms, base in middle with one large subtriangular process directed upwards, in lateral view with two large arms coiled backwards. Lateral sclerites large, transverse, with apices strongly hooked. Anterior sclerite subtrapezoidal, with deep U-shaped incision in middle of anterior margin, in lateral view with triangular process directed laterally.

Spermatheca ( Fig. 13 ). Vasculum C-shaped with enlarged pear-like basal part and narrow apical half. Bulbus very short and transverse, with glandular insertion moderately convex. Ductus spermathecae ca. twice as long as vasculum, without coils, but with 3–4 simple loops in proximal half, base slightly wider. Bursa copulatrix with small U-shaped sclerite near entrance of ductus spermathecae.

Distribution. Greece: Central Greece ( Tomov 1990, present publication), Epirus (present publication).

Differential diagnosis. The males of L. tymphristica can be distinguished from most of the species discussed here by the shape of the mandibles which are of the same width across the whole length and the inner margin is regularly rounded. Only males of L. leonardii sp. nov. have a similar structure of the mandibles. In the other four species ( L. balcanica , L. graeca , L. longimana and L. daccordii sp. nov.), the mandibles are subapically constricted with inner margin forming sharp angle. For detailed differential diagnosis between L. tymphristica and L. leonardii sp. nov. see the diagnosis under L. leonardii sp. nov.

Figures

FIGURES 5 – 8. Aedeagus in dorsal, lateral and ventral views. 5 — Labidostomis balcanica; 6 — L. graeca; 7 — L. longimana; 8 — L. tymphristica. 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).