Solariola gestroi (A. Solari & F. Solari, 1904)

Fig. 1: A–F; Fig. 10–11: A; Fig. 12: (1).

Otiorhynchus (Troglorhynchus) gestroi A. Solari & F. Solari, 1904: 169. Troglorhynchus (Solariella) gestroi: Flach, 1905: 318; Normand, 1908: 227. Troglorhynchus (Solariola) gestroi: Hoffmann, 1950: 151.

Solariola gestroi: A. Solari & F. Solari, 1923: 51; Luigioni, 1929: 871; Porta, 1932: 57; Lona, 1937: 233; Osella, 1976: 194; Abbazzi et al., 1989: 321; Abbazzi & Osella, 1992: 302; Abbazzi et al., 1995: 22; Osella & Di Marco 1996: 355; Colonnelli, 2003: 46; Osella et al., 2005; Abbazzi & Maggini, 2009: 58; Magnano and Alonso Zarazaga, 2013: 346.

Type locality. Vallo della Lucania, S. Biase di Ceraso.

Holotype. Male, with the following labels: 1) S. Biase di Ceraso, 20.V.1902 [white handwritten], [leg.] Solari [white printed]. 2) Type [white printed] ♂, Troglorhynchus Gestroi Solari Boll. Soc. E. it. 1903 [white handwritten]. Solariola gestroi (A. & F. Solari, 1903) HOLOTYPE [red printed] (MSNM).

Paratypes. Two ♀♀, with the following labels: 1) S. Biase di Ceraso, 20.V.1902 [white handwritten], [leg.] Solari [white printed]. 2) cotype [white printed] ♀, Troglorhynchus Gestroi Solari Boll. Soc. E. it. 1903 [white handwritten]. Solariola gestroi (A. & F. Solari, 1903) PARATYPE [red printed], (MSNM). 1) S. Biase di Ceraso, 20.V.1902 [white handwritten], [leg.] Solari [white printed]. 2) cotype [white printed] ♀, Troglorhynchus Gestroi Solari Boll. Soc. E. it. 1903 [white handwritten]. Troglorhynchus Gestroi Solari cotype [white handwritten]; PARATYPE Ot. Troglorhynchus Gestroi A. & F.Solari [red printed and handwritten]; Museo Genova Coll. A. Dodero (acquisto 2000); Solariola gestroi (A. & F. Solari, 1903) PARATYPE [red printed] (MSNG).

Other specimens. 67 ♂♂ ♀♀, with the following data: S. Biase di Ceraso, 7.XI.1902, [Leg.] Bensa; Vallo Lucano, [leg.] Solari; S. Biase, Vallo Lucano, 12.VI.1904, [leg.] Solari; same data, V.1904; same data; 8.VI.1904; same data, VI.1904; same data, 10.VI.1904; same data, 15.VI.1904; same data 25.V.1907; Stazione Ferroviaria di Sicignano, Prov. Salerno, 12.IV.1909, [leg.] Andreini; Vallolucano, Novi Velia, 29.IV.1966, Sbordoni Leg.; Salerno Vallo della Lucania Novi Velia, 31.X.2011, Leg. Bellò C. (CBA, CBE, MSNM, MSNG, GOS).

Diagnosis. Small (2.55–2.85 mm) with long pronotal setae, long elytral setae curved and very strongly inclined towards elytral surface (angle 0–5°), long funiculus with last four segments longer than wide.

Holotipe redescription: Body length 2.64 mm, maximum width of elytra 0.78 mm. Head thinly punctured on frons, this with median slightly elongate dimple and long setae pointing backward. Rostrum 1.18 times wider than long, slender, slightly arched, with rostral carinae closest to base. Under sides of rostrum densely covered under the scrobe with whitish-yellowish spatulate setae, also partially visible dorsally around eyes. Antennal scape 5 times longer than wide, slightly curved in the proximal third, regularly thickened from base to apex which is curved on the basal third; funicle more than 8 times longer than wide, segment 1 of funicle clavate, more than twice longer than wide, 2 obviously longer than wide, 3 rectangular and slightly conical, 4–7 subquadrate and longer than wide, 7 longer than the others except the first two; club oval, three segmented, 0.53 times longer than wide, densely covered with short setae. Prothorax nearly as long as wide, strongly convex, widest slightly apicad of middle, centripetal discal setae strongly inclined and more than three times longer than the average diameter of the larger points. Elytra elongate oval, twice longer than wide, sub-parallel sides regularly convergent to apex, scarcely and very regularly curved, maximum width at midlength, narrowing apically, sutural interval flat. Interstriae clearly demarcated by striae, flat, with small punctures whose number is less than that of the points of striae, each bearing a laterally flattened seta (average length 0.08 mm), almost curved and strongly inclined on elytral surface (angle 0–5°). Aedeagus moderately and very regularly curved, sclerotisation of sides broadened in basal half, sides parallel from base to midlength, with medially convergent sides, shortly subsinuate on anterior third, apex acuminate; subtriangular lamella with partially covered sides.

Female genitalia and variabilty. Spermatheca with nodulus broadened and long cornu with slightly curved apex. No significant differences were observed in non-paratype specimens. Female paratypes are normally larger than males.

TL SL SW FL FW CL CW PL PW PW EL EW EW PS ES --- ---

PL EL

♂ holotype 2.65 0.41 0.09 0.51 0.06 0.22 0.12 0.60 0.57 0.95 1.6 0.82 0.51 0.09 0.08 Distribution. Known only from the surroundings of type locality (Fig. 12).

Affinities. This species is taxonomically mainly related to S. hirtula and S. fraterna, differing from S. hirtula by the strongly inclined elytral setae and long funiculus with the last four segments longer than wide, and from S. fraterna by the more slender appearance of pronotum, deeper points of elytra and strongly inclined elytral setae.

Ecology. This species was described from three specimens collected in Castanea sativa Miller forest under leaves (Solari & Solari, 1904). Adults occur in late spring or early summer, collected either by sifting leaf litter or under deep stones (Osella, 1976).