Coenosia flavohumeralis, Couri, Marcia S. & Pont, Adrian C., 2016

Couri, Marcia S. & Pont, Adrian C., 2016, Coenosia Meigen (Diptera: Muscidae) from Angola: new species and records, Zootaxa 4103 (6), pp. 501-512 : 506-507

Coenosia flavohumeralis sp. nov.

( Figs 2, 7–9 )

Type material examined. Holotype male, ANGOLA: (A40), Tundavala, 8–10 mls. NW. Sa da Bandeira, 27–29.iii. 1972 / Southern African Exp., B.M.1972-1. Paratypes, 2 females, same labels as holotype (1 MNRJ).

Diagnosis. Ground-colour brown with grey pollinosity; postpronotum yellow with a little grey pollinosity; legs yellow with a preapical brown ring on mid and hind femora; abdomen with brownish-grey pollinosity, syntergite 1+2 yellowish; sternite 5 large, triangular, with two concavities on apical margin ( Fig. 7 ).

Description. ( Fig. 2 ) Ground-colour brown with grey pollinosity; head with frontal vitta dark brown; ocellar triangle yellow pollinose; fronto-orbital plate, face, parafacial and gena grey pollinose; antenna dark brown, tip of pedicel yellow; arista brown; palpus dark yellow on basal two-thirds and brown on apical third; scutum with one median brown vitta; scutellum uniformly grey pollinose; postpronotum yellow with a little grey pollinosity; pleura somewhat yellow with grey pollinosity; calypters white; haltere yellow; wing clear; legs yellow with a preapical brown ring on mid and hind femora; tarsi brown; abdomen with brownish-grey pollinosity, syntergite 1+2 yellowish.

Male. Body length: 2.5 mm; wing length: 2.6 mm.

Head. Eye bare; frons at vertex about one-third of head-width; frontal row with 3 pairs of setae, and 1 pair of reclinate orbitals; inner and outer verticals and ocellars short and similar in size; antenna inserted at mid-level of eye, with postpedicel about 2.5 times the length of pedicel; arista with short and fine hairs along its whole length; palpus filiform.

Thorax. Acrostichal setulae in 2 rows, prescutellar pair not differentiated; dorsocentrals 1+3, all long; postpronotal 1, long; 1 presutural and 1 postsutural intra-alar, 1 postsutural supra-alar; 2 postalars; prealar absent; notopleuron with 2 setae, similar in size; anepisternum with series of 4 long setae; katepisternals 1+1+1, arranged in an equilateral triangle. Scutellum with 1 long basal and 1 long apical pair of setae.

Legs. Fore femur with 2 anterior setae on basal third and with 3–4 sparse setae on anterodorsal and posterodorsal surfaces; fore tibia with a long posterior median seta, anterodorsal, dorsal and posterodorsal preapicals, and 1 ventral apical; mid femur with 2 anterior setae on middle third, 4–5 well-spaced posteroventral and anteroventral setae on basal and middle thirds, and 2 posterior preapicals; mid tibia with 1 anteroventral and 1 median anterior, the anterior seta inserted a little below the other, with preapicals on dorsal and posterodorsal surfaces and 1 ventral apical; hind femur with an anterodorsal and an anteroventral row of well-spaced setae; hind tibia with 1 anterior and 1 posterodorsal median setae, inserted almost at the same level, 1 long submedian posterodorsal,1 anterodorsal and 1 dorsal on apical third, apicals on anteroventral and ventral surfaces.

Wing. Veins bare; veins M and R4+5 parallel at wing-tip; lower calypter about twice the length of the upper one.

Abdomen. Tergite 3 with 1 pair of lateral setae; tergites 4–5 each with a discal row of setae. Sternite 1 bare. Sternite 5 large, triangular, with two concavities on apical margin ( Fig. 7 ).

Terminalia. Cercal plate and surstylus as in Fig. 8 ; cercal plate with a tuft of setae on the ventral apex. Aedeagal complex as in Fig. 9 ; distiphallus long and membranous.

Female: Body length: 2.6 mm; wing length: 2.6–2.7 mm. Similar to male.

Etymology. The specific name refers to the yellow colour of the postpronotal lobes, contrasting with the grey pollinose scutum.

Discussion. This species runs in Emden’s (1940) key to the C. vittata -group, and within this group to Coenosia edwardsi ( Emden, 1940) , but in this species the basal scutellar setae is much shorter than the apical one, and the fore femur is dark brown.

Geographical distribution. Angola.

Figures

FIGURES 1 – 9. (1) Coenosia lucens sp. nov., male dorsal view; (2) Coenosia flavohumeralis sp. nov., male dorsal view; (3) Coenosia setosa sp. nov., male, dorsal view. (4 – 6) Coenosia lucens sp. nov., male: (4) sternite 5, dorsal view; (5) cercal plate, dorsal view; (6) aedeagal complex, lateral view; (7 – 9) Coenosia flavohumeralis sp. nov., male: (7) sternite 5, dorsal view; (8) cercal plate and surstyli, dorsal view; (9) aedeagal complex, lateral view.