Trigava obrieni Song, Malenovsky & Deckert sp. nov.

Figs 1C, D, 2C, D, 4A-J, 5A-H

Type locality.

Brazil, Rondônia State, 62 km SW Ariquemes, Fazenda, Rancho Grande.

Type material.

Holotype ♂, Brazil: Rondônia, 62 km, SW Ariquemes, Fzda, Rancho Grande, 19-XI-1994, C.W. O’Brien & L.B. O’Brien leg. (LBOB; dry-mounted, pinned). Paratypes: Brazil: 1♂, 1♀, same data as holotype but 18-XI-1994 (LBOB); 1♂, same data as holotype but 4-16-XI-1997, J.E. Eger leg. (LBOB).

Diagnosis.

Trigava obrieni sp. nov. is similar to T. brachycephala in most characters, but can be separated from the latter by the longer head curved upward about 60° in front of eyes (in T. brachycephala, the cephalic process is distinctly shorter and curved upward more than 90° in front of eyes) and the ventral lobes of the aedeagus without a tooth at the base (with a minute tooth at base in T. brachycephala). This new species also may be differentiated from T. recurva (Melichar) by the gonostyles with the dorsal process short and the hook-like process situated submedially and curved basad (dorsal process distinctly elongate, hook-like process situated more basally and curved apicad in T. recurva), and the ventral lobes of the aedeagus without long spines (with long spines in T. recurva).

Description.

Measurements (in mm; 3♂, 1♀). Body length from apex of head to tip of tegmina: ♂ 10.8-11.2, ♀ 12.5; head length (includes: apex of cephalic process to constricted and curved part + from curved part to base of eyes): ♂♀ (0.4-0.5)+(1.0-1.1); head width including eyes: ♂ 1.4-1.5, ♀ 1.6; tegmen length: ♂ 8.5-8.9, ♀ 9.8.

Coloration. Head stramineous green, lateral and intermediate carinae of frons in front of eyes black to blackish brown, lateral areas in front of eyes green. Pronotum and mesonotum stramineous green, upper lateral carinae of pronotum green. Tegmina and hindwings with membrane hyaline, costal margin black to dark brown, veins green to greenish yellow, pterostigmal area more or less greenish ochraceous. Legs yellowish brown, base, apex and apical spines of tibiae fuscous. Abdomen dorsally and ventrally greenish ochraceous.

Structure. Head with cephalic process relatively long, in lateral view (Fig. 4B), curved upward about 60° in front of eyes. Vertex (Fig. 4A) broad, with ratio of length at midline to width between eyes (1.5-1.6):1. Frons (Fig. 4C) flat, relatively broad, with ratio of length at midline to maximum width 2.4:1.

Male genitalia. Pygofer in lateral view (Fig. 4E) with ratio of ventral to dorsal width about 1.7:1; posterior margin produced into a small, apically obtuse process near middle. Gonostyles (Fig. 4F) large and broad, dorsal process short, acute apically, more or less incurved and directed dorsoanteriad; hook-like process placed submedially, horizontal with dorsal process, curved basad (Fig. 4G). Aedeagus (Fig. 4H-J) slender and elongate, endosomal processes curved dorsoanteriad; phallobase sclerotized and pigmented at lateral sides, membranous and slightly inflated dorsally and ventrally: dorsal lobes V-shaped at apex, curved and directed posterolaterad; a pair of lateral lobes large and elongate, thumb-like, apex with a long spine, directed posteriad; ventral lobe small, butterfly-shaped, base expanded laterad, apex produced in a pair of thumb-like moderate lobes, without spine, directed laterad. Segment X (Fig. 4D, E), in dorsal view, with lateral margins more or less convex near middle, with ratio of length to width near middle about 2.0:1.

Female genitalia. As in generic description (Fig. 5A-H).

Etymology.

The new species is named after the late Dr Charlie W. O’Brien, former professor at Florida Agricultural and Mechanical University, USA, one of the world’s top experts in weevils, collector of the type specimens and husband of Dr Lois B. O’Brien, in recognition of their kindest help and support to the first author when he visited USA in 2017. The species name is to be treated as a noun in genitive case.

Distribution.

Northwestern Brazil.