Cheiromyia pennaticornis Parent
Creators: name: Brooks, Scott E.
name: Cumming, Jeffrey M.
name: Pollet, Marc A. A.
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Dolichopodidae
Cheiromyia
Cheiromyia pennaticornis

description: Cheiromyia pennaticornis (Parent)
(Figs. 1 C–D, 2A,E, 7A–C, 8B)
Cheirocerus pennaticornis Parent, 1931: 11.
Cheiromyia pennaticornis (Parent): Dyte 1980: 223.
Recognition (male). This species can be easily recognized by the following features: postpedicel elongate, triangular, with 10–11 projections on the outer surface (Figs. 1 C,D); head broad, face and clypeus broad and opaque yellow (Fig. 2A); wing with brownish tint (Fig. 2E).
Redescription. Male: Body length: 4.9–5.4 mm, wing length: 4.8–5.1 mm. Head: Distinctly broader than high. Postoculars setae: upper 6–7 dark, lower setae pale, lowermost 4–5 setae dark. Frons subrectangular (wider than high), short, dark with green-blue and violet metallic reflections. Face (Fig. 2A) opaque yellowish brown, very broad. Clypeus concolorous with face, broad, subrectangular (wider than high), lower margin truncate, ending well above lower eye margin. Palpus pale, subovoid, projecting anteriorly, outer surface with well-developed anteriorly projecting setulae. Proboscis projecting anteriorly, anterior surface of each labellar lobe with close-set row of 3 long curly hairs. Antenna (Fig. 1 C,D) mainly pale, scape and pedicel infuscated dorsally, postpedicel with dorsal margin dark and ventral margin infuscated on medial surface, postpedicel projections dark, stylus dark; scape obconical, with acute medial and ventral process; pedicel somewhat expanded and flattened; postpedicel triangular and elongate, about 4x as long as wide, evenly tapering toward apex, with 8–11 pubescent digitiform projections on outer surface, projections occasionally bifurcate, basalmost projection short with wider base; stylus dorsal, well before middle of dorsal margin of postpedicel, basal article elongate but not extending to tip of postpedicel, distal article plumose. Thorax: Scutum metallic green with blue and violet reflections, dark bronze area above notopleuron (pre- and postsutural). Scutellum metallic green with violet or coppery reflections. Mesopleuron gray pruinose with dark often brownish background coloration, with metallic reflections. Legs: Coxae mainly dark, femora pale, tibia and tarsi mainly pale to distinctly infuscated. I: CxI mainly dark with pale area mediobasally; FI with dense setulae on av surface; TI not swollen; It1–5 decreasing in length distally, It3–5 with narrow strip of pale velvety pile on ventral surface, claws enlarged and stout (often crossed in preserved specimens). II: CxII mainly dark, tip of anterior surface pale; tarsus II entirely dark or infuscate from tip of IIt1– 5. III: CxIII dark; TIII infuscate on anterior and posterior surface; tarsus III entirely dark. Wing: With uniform brownish tint; M with weak arc beyond bend (Fig. 2E), similar to C. bicornis and C. palmaticornis. Abdomen: Tergites 1 – 5 dark metallic greenish-black, with silverish pruinosity laterally. Hypopygium (Figs. 7 A–C): Epandrium with left bv epandrial lobe rounded apically sometimes with dentiform projection immediately distad bv epandrial seta, right bv lobe rounded and projected, sometimes with dentiform projection immediately distad bv epandrial seta; apv epandrial lobe elongate, projecting ventrally, with 2 long apicolateral setae, bifurcate apically. Surstylus: dorsal arm with saclike medioventral lobe, with dorsal finger-like process bearing short apical seta, apex with microtrichia ventrally; ventral arm with sinuous apical seta, subapical crest present. Postgonite digitiform. Cercus pale with broad dark outer margin, subovoid, apical margin somewhat truncate, with long fine apical seta. Hypandrium with medial notch apically, left side with small dentiform process. Phallus strongly widened preapically, with preapical flap-like dorsal process, apex narrow. Sperm pump elongate; ejaculatory apodeme with ventral curve. Female: Unknown.
Type material examined. HOLOTYPE 3 from Sarampiuni, La Paz Department, Bolivia, labelled: “Bolivia-Mapiri/ 13.3.03 / Sarampioni [15°25'S 68°06'W] 700” [green label]; “ Typus / Cheirocerus / pennicornis [sic!] Par.” [red label]; “ Cheirocerus / pennicornis [sic!] n.sp./ O. Parent”; “Staatl. Museum für/ Tierkunde, Dresden”; “Coll. W. Schnuse/ 1911 – 3” [pale green label]; “ SYNTYPUS / des. U.Kallweit/ 1993” [orange label]; “ Cheirocerus / pennaticornis ”; “ HOLOTYPE / Cheiromyia pennaticornis (Parent) ” [red label] (SMTD).
Additional material examined. BRAZIL: 33 Acre, Mâncio Lima (07°36'S 72°53'W), Parque Nacional da Serra do Divisor, 5.xi.2007, Malaise, L. Menezes (MZSP); 13 Amazonas, Manaus (03°06'S 60°01'W), 13.ii.1976 (INPA); 13 Pará, Tucuruí (03°46'S 49°40'W), Vila Brava, 27.vi.1980, eq. Nunes de Mello (INPA).
Distribution. Cheiromyia pennaticornis is known from the type locality in the village of Sarampiuni, on the Rio Sarampiuni (a tributary of the Rio Mapiri), La Paz Department, Bolivia, and from the Brazilian States of Acre, Amazonas and Pará (Fig. 8 B).
Remarks. Kallweit and Negrobov (1994) listed the holotype of C. pennaticornis in their catalog of dolichopodid types in the SMTD, but the specimen was mislabelled as a syntype in 1993. We have added a holotype label in order clarify the status of this specimen. Prior to this study, the terminalia of the male holotype was removed and macerated, presumably with KOH or NaOH. It is now completely transparent and nearly impossible to see in the genitalia vial pinned under the specimen.
description: Published as part of Brooks, Scott E., Cumming, Jeffrey M. & Pollet, Marc A. A., 2010, Revision of the Neotropical genus Cheiromyia Dyte (Diptera: Dolichopodidae), pp. 41-58 in Zootaxa 2333 on pages 54-55, DOI: 10.5281/zenodo.193135