Cheiromyia bicornis Brooks

Brooks, Scott E., Cumming, Jeffrey M. & Pollet, Marc A. A., 2010, Revision of the Neotropical genus Cheiromyia Dyte (Diptera: Dolichopodidae), Zootaxa 2333, pp. 41-58 : 46-47

publication ID	https://doi.org/ 10.5281/zenodo.193135
DOI	https://doi.org/10.5281/zenodo.6202525
persistent identifier	https://treatment.plazi.org/id/48372857-FFAB-FFB9-DAD5-D19D7A5BDBC8
treatment provided by	Plazi
scientific name	Cheiromyia bicornis Brooks
status	sp. nov.

Treatment

Cheiromyia bicornis Brooks View in CoL sp. nov.

( Figs. 1 View FIGURE 1 A, 3A–C, 8A)

Recognition (male). This species is easily recognized by the following features: postpedicel with one digitiform projection on outer surface; antenna entirely dark brown; face dark brown and narrow; femora infuscated.

Description. Male: Body length: 3.2 mm, wing length: 3.0 mm. Head: Postocular setae: apparently all black (obscured in unique holotype). Frons subrectangular (wider than high), dark with violet and blue-green metallic reflections. Face dark brown, opaque, narrow (cf. Fig. 2C), sides convergent below. Clypeus subquadrate with upper part pale and lower margin dark brown. Palpus pale brown, with short setulae on outer surface. Proboscis without close-set row of 3 fine elongate hairs on anterior surface of each labellar lobe. Antenna ( Fig. 1 View FIGURE 1 A) entirely dark brown; scape obconical, with acute medial process; pedicel short; postpedicel ovoid basally with digitiform apex, outer surface with single elongate digitiform projection extending to apex of postpedicel; stylus mid-dorsal, basal article elongate, extending to tip of postpedicel, distal article strongly pubescent. Thorax: Scutum metallic violet and greenish blue. Scutellum metallic violet with greenish-blue reflections. Mesopleuron dark metallic brownish with light gray pruinosity, anepisternum with metallic green reflections. Legs: Coxae mainly dark; femora infuscated, smoky with pale yellow ground coloration; tibiae and tarsi pale. I: TI not swollen; It1–5 decreasing in length distally, It2–4 with pale velvety pile on anterior surface, inner claw longer sigmoidal. II: CxII: mainly dark, tip of anterior surface pale, FII with av setulae slightly longer than other femoral setulae. III: FIII with av row of setulae distinctly stronger than other femoral setulae. Wing: Hyaline; M with weak arc beyond bend similar to C. palmaticornis and C. pennaticornis (cf. Fig. 2E). Abdomen: Tergites 1–5 dark metallic bluish-black, with silverish pruinosity laterally. Hypopygium ( Figs. 3 View FIGURE 3 A–C): Epandrium with left bv epandrial lobe short, rounded apically with bv epandrial seta on medial surface, right bv epandrial lobe scarcely developed as slightly raised area at base of bv epandrial seta; apv epandrial lobe projecting ventrally with narrow pointed apex, with 2 long lateral setae, base of lobe with bulging weakly sclerotized to membranous area medially, left and right lobes largely symmetrical. Surstylus: dorsal arm with sac-like medioventral lobe, with curved thumb-like dorsal process bearing subapical seta, apex with microtrichia ventrally; ventral arm with narrow apex bearing 2 stout setae, with medially produced subapical crest. Postgonite digitiform, somewhat laterally compressed. Cercus mainly dark, pale basally, ovoid, with rather long seta on apical margin. Hypandrium widened near middle. Phallus strongly widened preapically. Ejaculatory apodeme with ventral curve. Female: Unknown.

Type material. HOLOTYPE 3 from Brazil, labelled: “ BRASIL, Acre, Cru-/ zeiro do Sul, Rio Moa/ 073702S-724615W [07°37'02"S 72°46'15"W]/ 19–28.xi.1996 ”; “Varredura/ Mata ”; “J.A.Raphael; J.Vidal/ & R.L.Menezes”; “ HOLOTYPE / Cheiromyia bicornis / Brooks” [red label] ( INPA).

Distribution. Cheiromyia bicornis is only known from the holotype which was collected along the Rio Moa, in Cruzeiro do Sul, in the western Brazilian state of Acre ( Fig. 8 View FIGURE 8 A).

Etymology. The new species name is derived from the Latin bi (two) and the Latin cornu (horn), and refers to the two-pronged structure of the male postpedicel.