Labidostomis (Labidostomis) graeca 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 : 324

Labidostomis (Labidostomis) graeca Tomov, 1990

( Figs 6 , 17 , 23 , 29 , 35 )

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

Type locality. “ Peloponneso, Killini ” [= Kyllini Mt. ].

Types examined. Holotype ( Fig. 35 ): ♂, “PELOPONNESO, Killini / 2300 m 16.VII.´81 / M. & G. Osella [w, p] // Holotypus [r, p] // Labidostomis / graeca sp. n. / V. Tomov det. 1988 [w, p]” (MSNV).

Additional specimens examined. 2 specimens — GREECE: West Greece: Achaea, Patras, Kelmos Mt. , near Kalavryta , 1000–2200 m, 3.viii.1980, 1 ♂, P. Audisio & M. C. Angelini leg. ( RRCA); Chelmos , 22°18´E 37°53´N, 2000 m, 24.vii.1992, 1 ♂, Majer leg. ( FKCC).

Additions to description. Body length: ♂♂ 6.2–6.6 mm (holotype 6.6 mm).

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

Mandibles ( Fig. 23 ). Mandibles small, distinctly constricted preapically, with dorsal keel distinct but not elevated. Inner slopes slightly concave, the angle between lateral and apical parts of inner margins is about 90° thus apical part of inner margin is nearly transverse.

Antennae ( Fig. 29 ). Antennomere IV subtriangular, ca. 1.30 times as long as wide.

Aedeagus ( Fig. 6 ). Apical quarter convergent with distinctly concave margins, apex subtriangular. Dorsal median impression moderately concave with thin median keel. Apex of aedeagus with two well developed inward triangular crooked folds, between folds with large and deep elongate cavity for insertion of apical sclerite. Operculum trapezoidal with straight anterior margin. Visible part of non-everted anterior sclerite transverse, thin, with thin, long and sharp median process. In lateral view, ventral side of aedeagus only slightly convex.

Everted aedeagus ( Fig. 17 ). Ejaculatory guide compact, transversely oval, with concave basal margin, with wider and short median process directed upwards, in lateral view with two short arms coiled backwards. Lateral sclerites narrow, elongate, with hooked apices. Anterior sclerite large, forming two concave wings connected in basal suture, in dorsal view with large v-shaped incision, in lateral view subtriangular.

Female unknown.

Distribution. Greece: Peloponnese peninsula.

Differential diagnosis. The males of Labidostomis graeca have mandibles constricted preapically with inner margin forming sharp angles. Based on this character the most similar species are L. balcanica , L. longimana and L. daccordii sp. nov. All these species can be distinguished by the structure of aedeagus ( Figs 5–7 , 9 , 16–18 , 20 ). Moreover, Labidostomis balcanica differs by completely pale brown elytra in males (with small blurred dark spot on humerus in L. graeca ) and mandibles with basally elevated dorsal keel (not elevated in L. graeca ).

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 16 – 18. Aedeagus with everted internal sac. 16 — Labidostomis balcanica; 17 — L. graeca; 18 — L. longimana. 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).

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