Larinus perrinae Gültekin, 2006

Gültekin, Levent, 2006, A new species of the weevil genus Larinus Dejean from Turkey and Syria (Coleoptera: Curculionidae: Lixinae), Zootaxa 1248, pp. 21-26 : 22-23

Larinus perrinae Gültekin sp. n.

( Figs. 1–4 )

Material

Holotype (male), paratypes 2 (female), 1 (male): Syria, “ Syrie ”, “Ex Musaeo Desbrochers, 1914”, “Museum Paris, Coll Desbrochers”; paratype (female): Turkey, Hatay Prov.: “ Syrie, Akbes, C. D. 1891”, “ remissus ” (misidentification), “Ex Musaeo Desbrochers, 1914”, “Museum Paris, Coll Desbrochers”; paratype (female): Turkey, Hatay Prov.: “ Syrie, Akbes, C. D. 1891”; paratype (male): Syria, “ Syrie ”, “ L. centaurii ” (misidentification). The holotype and three paratypes are deposited in the Muséum National d’Histoire Naturelle, Paris, France.

Description

Measurements. Body length: 9.8–10.2 mm.

Coloration. Body black; antennal scape dark brown.

Vestiture. Head with short bifid white scales on ventral surface and along lateroventral eye margin, dorsal eye margin with long hair­like scales pointing to frontal fovea. Scales of this kind sparsely scattered also around frontal fovea and on basal half of rostrum in female. Whitish hair­like scales concentrate along sides of pronotal disc and condensed in indistinct stripes in apical half and basal one third ( Fig. 1 ). Elytra with scattered whitish spots constituted by similar scales condensed in indistinct longitudinal stripes on 2nd–4th and 8–10th intervals ( Fig. 1 ). Legs, apical part of scape and funicle of antennae uniformly clothed with similar whitish scale. Ocular lobes bearing long and dense brownish hair­like setae pointed toward eyes.

Male. Rostrum 5.0 times as long as wide at apex, 1.2 times as long as pronotum, cylindrical, very weakly narrowed distal to antennal insertion and widened at apex ( Fig. 2 ). Apical part of rostrum 0.92 times as wide as its base, 0.66 times as wide as fore femur in widest part. Ventral margin of antennal scrobe not clearly visible dorsally. Surface of rostrum shiny, with punctuation fine and somewhat larger up to antennal insertion level, then becoming smaller and finer. Dorsal surface with short and very shallow longitudinal fovea in place of antennal insertion. Antennae inserted at 0.50 length of rostrum from apex. Scape 0.81 times as long as funicle, gradually widening toward apex, strongly widened at apex. First segment of funicle 1.43 times as long as 2nd, 2nd segment 1.38 times as long as 3rd, 3rd and 4th segments of equal length, 5–7th segment transverse, gradually widening to apex, 7th segment 1.83 times as wide as 1st. Club 1.37 times as long as wide, elongate­ovate with acuminate apex. Eyes flat, transverse, with dorsal part wider than ventral one. Frons with small, narrow, shallow fovea ( Fig. 2 ).

Pronotum 1.43 times as wide as long, narrowing toward apex, neck­shaped constricted in apical 1/6. Base moderately deeply bisinuate, scutellar area produced toward scutellum. Ocular lobes not well developed; apical margin of prothorax evenly curving ventrally, emarginated below ocular lobes area. Disc moderately convex, finely and densely punctuate.

Elytra 1.46 times as long as wide, in widest place 1.27 times as wide as pronotum, parallel­sided in basal 2/3, then moderately narrowing toward apex. Intervals flat, about 4.5 times as wide as striae; striae shallow, formed from elongate­oval connected punctures.

Legs. Femora moderately swollen medially, fore femur 1.50 times as wide as middle femur, 1.12 times as wide as rostrum at apex. Tibiae medium­long, fore tibia weakly incurved, middle and hind tibiae straight. Inner margin of fore tibia deeply emarginated medially and bearing small blunt denticles; denticle closest to uncus larger and sharper, concealed by tuft of setae. Fore and middle tibiae with large, wide unci of subequal lengths; uncus on hind tibia somewhat shorter and smaller than on middle tibia. Apical comb of fore tibia hanging over base of uncus, with spines short, dense, not connate basally. Spines in apical comb of middle and hind tibiae longer and denser than on fore tibia. First tarsal segment triangular, longer than wide; 2nd segment moderately transverse, somewhat widening apically. Claw­segment moderately widening apically, extending from lobes of 3rd segment by about 2/3 of its length. Claws connate, weakly diverging, with parallel outer margins.

Aedeagus in dorsal view narrowing from base to apex, swollen medially; then constricted before apex, narrowing apically ( Fig. 4 ).

Female. Rostrum 1.60 times as long as pronotum, cylindrical, gradually narrowing from base to antennal insertion, weakly widened in this part; then distinctly constricted toward apex and again widened at apex ( Fig. 3 ). Antennal scrobes weakly visible dorsally, frontal fovea wider and deeper than in male. Pronotum 1.52 times as wide as long. Elytra 1.39 times as long as wide.

Remarks

The new species is closely related to L. lejeunei Capiomont, 1874 but clearly differs in the shape of elongated body and apical part of aedeagus. In addition, body of L. lejeunei is brownish, elytra distinctly wider than prothorax, pronotum trapeziform, with bifurcate whitish scales constituting longitudinal stripe on 2nd–4th intervals and scattered sparsely on body ( Fig. 5 ). Lateral margin of pronotum and elytra have similar stripes. The new species clearly differs from L. remissus Faust in the shape of body and rostrum: body of L. remissus is ovate, rostrum in male distinctly narrowed distal to antennal insertion, pronotum and elytra without stripes. Morphological differences of aedeagus of the L. perrinae ( Fig. 4 ), L. lejeunei ( Fig. 6 ) and L. remissus ( Fig. 7 ) were presented in figure plate.

Figures

FIGURES 1 – 7. Larinus perrinae Gültekin, sp. n. (1, 2, 4; holotype; 3; paratype), Larinus lejeunei Capiomont (5 – 6) and Larinus remissus Faust (7): 1, body outline; 2, rostrum (male); 3, rostrum (female); 4, aedeagus; 5, body outline (female, from Algeria, compared with type); 6, aedeagus; 7, aedeagus (from Nahcivan, compared with type). Scale bar: 1 mm.