Porphyrochroa bifida , Mendonça, Mirian Nascimento, Rafael, José Albertino & Ale-Rocha, Rosaly, 2008

Mendonça, Mirian Nascimento, Rafael, José Albertino & Ale-Rocha, Rosaly, 2008, Revision of the Brazilian Amazon Basin species of Porphyrochroa Melander (Diptera: Empididae), Zootaxa 1859, pp. 1-39: 7-8

publication ID

http://doi.org/ 10.5281/zenodo.183631

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scientific name

Porphyrochroa bifida

sp. nov.

Porphyrochroa bifida  sp. nov.

(Figs. 3 a –i; 18 c; 20)

Diagnosis: P. bifida  sp. nov. Is closely related to P. dactiloides  sp. nov., due to the presence of bifid apex of the cercus. It differs from the latter due to the presence of a pair of narrow posterior projections on tergite 8 and a pair of lateral posterior projections on sternite 7.

Description. Male: body length 2.6 mm; wing length 2.7 mm.

Frons and face shiny brown. Frons slightly narrower than width of anterior ocellus, subparallel sided, bearing two proclinate setae. Face slightly longer than frons and about half width of frons. Proboscis light-yellow, length equal to height of head. Palpus yellow, with one small and almost apical seta. Ocellar tubercule with light-yellow ocellus; two proclinate ocellar setae; two proclinate postocellar setae. Antenna with scape and pedicel yellow and flagellum brown; scape and pedicel medially verticillate; flagellum about four times longer than scape and pedicel combined. Postcranium shiny brown, with distinct brown setae and gray pruinescence; one pair of parallel vertical setae; postocellar setae distinct, arranged in complete single series with dorsal setae stronger. Gena and postgena with setae brown to black and sparse gray pruinescence. Thorax shiny brown, except pprn lobe yellow with conspicuous postsutural gray pruinescence. Thoracic setae: 6 slen- der ktg; 2 acr; 2 aprn; 4 sctl, larger internal pair; 1 pprn; 5 dc; 1 spal presut; 1 psut spal; 2 npl; 1 pal. Fore and mid legs yellow, contrasting with brown thorax; hindleg with coxae, trochanters and basal fifth of femora yellow, remaining segments brown; hind tibia with four posteroventral basal spines. All legs with short distinct setae. Wing hyaline with inconspicuous pterostigma; anal lobe wide ( Fig. 18View FIGURE 18 c). Halter yellow. Abdomen shiny brown, with metallic blue luster in diverse light incidence angles. Sternites brown. Tergite 7 with pair of posteroventral protuberances (Fig. 3 a); tergite 8 with narrower pair of projections (Fig. 3 a); sternite 8 wide, divergent apically (Fig. 3 b). Sternite 7 inclined in lateral view (Fig. 3 c). Terminalia: cercus elongate in lateral view (Fig. 3 d); with bifid apex and internal ventral projection in dorsal view (Fig. 3 h). Epandrium posteriorly projected, with distal spiniform setae (Fig. 3 e). Hypandrium with rectangular apex and setae lacking (Figs. 3 d; g); ejaculatory apodeme with three projections in anterior view (Fig. 3 f); subepandrial sclerite elongate (Fig. 3 i).

Female: Unknown.

Distribution: BRAZIL (Amazonas).

Type material: Holotype male: BRAZIL, Amazonas, Manaus, PDBFF-WWF, Proj.: Bert Klein / iv. 1985, Malaise / Reserva 1301 / Holotype male Porphyrochroa bifida  ( INPA). Paratypes: BRAZIL, Amazonas, Manaus, PDBFF-WWF, Proj.: Bert Klein, viii. 1985, Malaise, Reserva 1208 (2 male, INPA); iii. 1985 (1 male, INPA); vi. 1985 (2 male, INPA); iii. 1986 (1 male, INPA); xi. 1981, Malaise, Reserva 1210 (1 male, INPA); viii. 1985 (1 male, INPA); ii. 1985 (1 male, INPA); i. 1985, Malaise, Reserva 1301 (1 male, INPA); iv. 1985 (1 male, MZUSP); v. 1985 (1 male, MZUSP); xii. 1985 (1 male, MPEG); v. 1986 (1 male, MPEG); Res[erva] Campina, Arm[adilha] Malaise, 27.iii. 1990, J.Vidal (1 male, INPA).

Holotype condition: postocellar setae, postocular, postcranial, aprn, sctl, pprn, dc, spl, npl and pal broken. Left foreleg lost; left hindleg without tarsi and half of tibia; left wing mounted on microslide in Canada balsam; abdomen within microvial containing glycerin. Microslide and microvial pinned attached to the specimen.

Variation: in relation to the colouring pattern, two specimens with thorax and abdomen yellow; one specimen with thorax and abdomen dark brown (black); sizes from 2.6 to 3.5 mm and wings between 2.7 and 3.2 mm.

Etymology: from Latin bi = two, double. It makes allusion to the bifid apex of the cercus.

FIGURE 3. Porphyrochroa bifida  sp. nov., holotype male: a, Tergites 5–8, dorsal view; b, Sternites 5–8, dorsal view; c, Terminalia, lateral view; d, Hypandrium, phallus, cercus and subepandrial sclerite, lateral view; e, Epandrium, lateral view; f, Ejaculatory apodeme, anterior view; g, Hypandrium, posterior view; h, Cercus, dorsal view; i, Subepandrial sclerite, ventral view. Abbreviation: a cerc, anterior cercus; cerc, cercus; ej apod, ejaculatory apodeme; goncx apod, gonocoxal apodeme; hypd, hypandrium; p cerc, posterior cercus; ph, phallus; sbepand scl, subepandrial sclerite; ST, sternite; T, tergite; vpc, ventral projection of cercus.


Instituto Nacional de Pesquisas da Amazonia


Museu de Zoologia da Universidade de Sao Paulo


Museu Paraense Emilio Goeldi