Cheiromyia fuscipennis Pollet & Brooks

Brooks, Scott E., Cumming, Jeffrey M., Limeira-De-Oliveira, Francisco & Pollet, Marc, 2018, New species and records of Cheiromyia Dyte from Brazil and French Guiana (Diptera: Dolichopodidae), Zootaxa 4444 (3), pp. 267-282: 272-273

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Cheiromyia fuscipennis Pollet & Brooks

sp. nov.

Cheiromyia fuscipennis Pollet & Brooks  sp. nov.

( Figs 8 View Figure , 10 View Figure , 18, 19 View Figure , 25 View Figure )

Type material. HOLOTYPE: ♂, from the Mitaraka Mountains, French Guiana, labelled: “ FRENCH GUIANA: Mitaraka,| MIT-A-RBF1, 02°14′11.4″N,| 54°27′07.0″W, 306 m, on veg.| along muddy trail, 3.iii.2015,| SW, Marc Pollet”; “(FR-GU/Mitaraka/2015)| sample code:MITARAKA/050| (sorted by Marc Pollet, 2015)”; “La Planète Revisitée –| MNHNAbout MNHN / PNI Guyane | 2015 - APA-973-1”; “ HOLOTYPE | Cheiromyia fuscipennis  | Pollet & Brooks” [red label] ( MNHNAbout MNHN). PARATYPES: FRENCH GUIANA: Mitaraka Mountains: same data as holotype except, MITARAKA/050 (1♀, MNHNAbout MNHN); same data as holotype except, MITARAKA/055 (1♀, MAPC); MIT-A-RBF2, 02°14′12.5″N, 54°27′08.1″W, 287 m, on bamboo and banana-like leaves, 27.ii.2015, SW, MITARAKA/019 (1♀, MAPC).

Recognition (male). This species can be distinguished based on the following combination of characters: postpedicel ( Fig. 8 View Figure ), about 2.5X as long as wide, subovoid basally with narrow pubescent digitiform apex and 3–4 pubescent digitiform projections on outer surface, entirely dark brown; wing infuscate ( Fig. 10 View Figure ); fore tibia not swollen, fore tarsus with tarsomere 2 shorter than 3, fore tarsomeres 3–4 lacking distinct row of erect setae on inner margin; hypandrium with preapical hook-like process on each side ( Fig. 18 View Figure ). This species is very similar to C. brevitarsis  and C. laselva  , but can be distinguished by its infuscate wing, dark brown postpedicel and distinctive hypandrium.

Description. Male: Body length: 4.6 mm, wing length: 5.0 mm. Head: Eyes uniformly dull red. Upper-most 6–7 postocular setae black, lower 9 setae whitish yellow and lower-most 3 dark brown. Frons subrectangular (wider than high), dark metallic blue-green with violet reflections, lower 2/3 silvery pruinose. Face silvery white, relatively broad, (similar to C. brevitarsis  , see Fig. 1 View Figure ), narrowest at middle. Clypeus subrectangular (slightly wider than high), concolorous with face, 1/4 face height. Palpus pale, ovoid with short black setulae on apical half of outer surface. Proboscis brownish yellow, anterior surface of each labellar lobe with close-set row of 3 elongate, slightly flattened, brown setae with hook-like apical bend, lateral surface of each labellar lobe with long thin brown seta near middle. Antenna ( Fig. 8 View Figure ) with scape and pedicel reddish-yellow, scape slightly infuscate dorsally, postpedicel dark brown, with distinct greyish pruinosity, especially on medial surface; scape obconical, with acute medial and ventral processes; pedicel short; postpedicel about 2.5X as long as wide, subovoid basally with narrow digitiform pubescent apex, outer surface with 3–4 pubescent digitiform projections (1 bifurcate projection on right antenna of holotype), with basal-most projection shorter and stouter; arista-like stylus mid-dorsal, entirely black, 1.5X as long as postpedicel, basal article elongate (0.7X as long as apical article), reaching slightly beyond tip of postpedicel, distal article with long pubescence. Thorax: Scutum metallic green with violet and bronze reflections, dark bronze patch above notopleuron immediately posterior to suture. Scutellum concolorous with scutum. Mesopleuron gray pruinose with dark brown background coloration and weak metallic green to bluish reflections. Legs: Pale yellow with black setae, except as noted below. Fore leg: Coxa with weak silvery pruinosity, with weak brownish markings basally and on anterior surface; femur without dense setulae on anterovental margin (similar to Fig. 12 View Figure ); tibia not swollen; tarsus with pronounced outward bend, tarsomere 1 about equal to tarsomeres 3–4 combined, tarsomere 2 shorter than tarsomere 3, tarsomeres 3–4 lacking distinct row of erect setae on inner margin, tarsomeres 3–5 with sparse velvety pile on ventral surface, claws enlarged and stout (relative to other legs), crossed in holotype. Mid leg: Coxa with lateral surface and outer margin of anterior surface dark with silvery pruinosity; tarsus weakly infuscate from tip of tarsomere 1. Hind leg: Coxa with lateral surface brownish with silvery pruinosity; tarsus weakly infuscate from tip of tarsomere 1. Wing: Distinctly evenly infuscate ( Fig. 10 View Figure ); M with weak arc beyond bend. Abdomen: Tergites 1–5 brownish black with weak metallic greenish reflections and silvery pruinosity laterally. Hypopygium ( Figs 18, 19 View Figure ): Epandrium dark brown, with apicoventral 1/3 pale; basiventral epandrial seta present on each side at apical 2/3, left basiventral epandrial lobe acutely pointed, right basiventral epandrial lobe weakly developed, short with truncate apex; apicoventral epandrial lobe moderately-sized, projecting ventrally, with dark claw-like dorsal (outer) lobe bearing 2 long pale lateral setae and rounded membraneous ventral (inner) lobe (left and right apicoventral epandrial lobes largely symmetrical). Surstylus: dorsal arm with small medioventral lobe, with short finger-like dorsal process bearing tiny apical seta, apex slightly expanded with microtrichia medioventrally; ventral arm with stout curved apical seta, apex rounded, with subapical crest present. Postgonite digitiform. Cercus subovoid, mainly pale with narrow dark outer margin, with sparse short pale setae dorsally, and short erect dark setae along posterior margin, with one longer pale seta apically. Hypandrium ( Fig. 18 View Figure ) deeply divided medially into pair of lateral lobes, each bearing sclerotized dentiform process. Sperm pump folded back on itself, with simple single fold, opposing surfaces tightly appressed. Phallus widened preapically with large flap-like lateral process, apex narrow. Ejaculatory apodeme with ventral curve. Female: Body length: 5.5 mm, wing length: 5.0 mm. Similar to male except as follows: Face and clypeus broader, face parallel-sided. Palpus with 1 strong apical seta. Proboscis lacking close-set row of 3 elongate setae on anterior surface of each labellar lobe. Antenna unmodified (similar to Fig. 9 View Figure ), postpedicel lacking projections, small, about as long as wide, rounded triangular with acute apex, mainly dark brown with basal margin pale; aristalike stylus straight, 3X as long as first three antennal segments combined, inserted just beyond middle on dorsal margin, basal article short, 1/ 6X as long as apical article. Fore leg with tarsomere 2 as long as tarsomere 3. Terminalia with tergite 10 brown, divided medially into hemitergites each bearing 5 dark brown, blunt and apically flattened spines.

Distribution. Cheiromyia fuscipennis Pollet & Brooks  sp. nov. is known from the Mitaraka Mountains in southwestern French Guiana, where the type series was collected by sweep netting ( Pollet et al., 2018) in nonflooded palm swamps along the Alama River ( Fig. 25 View Figure ).

Etymology. The species name refers to the dark wings in this species, “ fuscus ” meaning dark, and “ penna ” meaning wing.

Remarks. This species seems closely related to C. brevitarsis  and C. laselva  based on the modified male fore tarsus with tarsomere 2 shorter than 3.


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