Urometopus osellai Yunakov sp. nov.

urn:lsid:zoobank.org:act: 01534AB6-88F1-4E6D-8473-AD2760FECDA8

Figs 7R, 43, 73B

Differential diagnosis

Urometopus osellai sp. nov. differs from all known species in its small body [BL: 1.90–2.70 mm]. It is similar to U. dieckmanni sp. nov. but differs from the latter in the following characters: rostrum shorter; thin antennae; more dense pubescence of elytra, interstriae with confused rows of erect setae; glabrous interspaces and less density of punctures of pronotal disc; lamina of median lobe attenuate (Fig. 43E); collum of spermatheca larger than ramus (Fig. 43G) (in U. dieckmanni collum significantly smaller than ramus).

Etymology

This species is named after the late Dr Giuseppe Bartolomeo Osella (1936–2022), famous Italian entomologist and expert in weevils, who first collected it.

Type material

Holotype TURKEY – Kastamonu • ♂; Ilgazdagi gecidi; 41.0580° N, 33.7346° E; elev. 1800–2300 m; 6–10 Jul. 1972; M. Osella and G. Osella leg.; MSNVR.

Paratypes TURKEY – Kastamonu • 4 ♂♂, 4 ♀♀; same collection data as for holotype; MSNVR • 1 ♂; same collection data as for holotype; MMTI • 1 ♂; same collection data as for holotype; NYC • 1 ♀; Ilgaz daglari, Ilgazdagi; 41.0646° N, 33.7428° E; elev. 1800–2000 m; 6 Jul. 1996; C. Bayer, T. Winkelmann and H. Winkelmann leg.; BRC • 2 ♂♂, 2 ♀♀; Ilgaz daglari, Ilgazdagi; 41.0646° N, 33.7428° E; elev. 1800– 2000 m; 7 Jul. 1996; Ch. Bayer leg.; BCC (Fig. 43C) • 1 ♂; same collection data as for preceding; MMTI • 2 ♂♂, 2 ♀♀; Ilgazdagi gecidi; 41.0536° N, 33.7180° E; elev. 2300 m; 20 Jul. 1975; G. Osella leg.; MMTI • 1 ♂, 2 ♀♀; same collection data as for preceding; BRC (Fig. 43A) • 4 ♀♀; same collection data as for preceding; MSNVR.

Type locality

Turkey, Ilgaz Mountains.

Description

MEASUREMENTS (mm). BL: 1.90–2.70 (2.23), BW: 1.07–1.41 (1.20), BH: 0.84–1.17 (0.96).

COLORATION AND VESTITURE (Fig. 43A, C). Chestnut brown; setose and sparsely squamose; suberect setae yellowish-grey, narrow and somewhat flattened, pointed and obtuse, somewhat shorter than width of interstriae, ordered in irregular row; interstriae sparsely covered with recumbent, piliform, curved, margaritaceous scales; each puncture in striae bears tinier subrecumbent piliform seta. Head vestiture: setose, setae suberect. Vestiture of antennae and legs setose; scape and funicle with subrecumbent setae; grooming brush on distal ⅓ of medial margin of metatibia vestigial.

HEAD (Fig. 43B, D). Rostrum in males parallel-sided to narrowing anteriorly in females; RL/RW = 0.73– 0.83. Pterygia projected in males, slightly projected in females. Frons U-shaped, nitid, weakly sloped anteriorly, not delimited from epistome by thin V-shaped carina. Epifrons well edged, parallel-sided, 1.6× as narrow as vertex, flat, with narrow median sulcus, coarsely punctate. Vertex without transverse depression. Eyes moderately convex; VW/ELD = 1.74–2.02. Costulation of head capsule terminates posteriorly of epifrons.

ANTENNAE. Scape reaches anterior margin of pronotum, evenly arcuate and widened apically; funicle slender; funicular antennomeres L/W: fam1 = 1.28, fam2 = 1.18, fam3 = 0.69, fam4 = 0.62, fam5 = 0.61, fam6 = 0.53, fam7 = 0.52; club L/W = 1.81.

THORAX. Pronotum: PL/PW = 0.64–0.80, transverse; weakly convex on disc; widest at middle, roundly narrowing anteriorly and posteriorly; wrinkly-punctate, punctures irregular, interspaces between punctures wider to narrower than diameter of puncture. Elytra ovate; disc weakly convex; striae shallow, interspaces between punctures as long as diameter of puncture; interstriae flat; EL/EW = 1.17–1.35.

LEGS. Tibiae: short and thick. Protibiae: medial margin in male weakly emarginate in distal ⅓; mucro moderate. Metatibiae: medial margin in males weakly emarginate in distal ⅓; mucro moderate. Tarsi: 1 st tarsomere as wide as 2 nd; 2 nd tarsomere 2× as wide as long.

ABDOMINAL VENTRITES (Fig. 43I). Anal ventrite of male truncate.

FEMALE GENITALIA. Spermatheca (Fig. 43G): nodulus not swollen; collum short, obtuse, in line with nodulus; ramus long, geniculate, obtuse, in line with nodulus; cornu roundly attenuate.

MALE GENITALIA (Fig. 43E). Median lobe as long as apodemes; parallel-sided and weakly sinuate. Lamina of median lobe attenuate, narrowly rounded. Endophallus with field of sparse short spicules in distal part (Fig. 43H). Lunar sclerite absent. Copulatory sclerite (Figs 7R, 43F) slim, spatulate, flagellar sheath well developed.

Notes

The differences demonstrated in the pair U. dieckmanni sp. nov. and U. osellai sp. nov. are similar to those of the pair U. helenae sp. nov. and U. kovali sp. nov.

Life history

Unknown.

Distribution

The range remains unclear; this species is known from few localities in Ilgaz Mountains (northwestern Anatolia, Turkey) (Fig. 73B).