Coenosia setosa, 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 : 508-510

Coenosia setosa sp. nov.

( Figs 3 , 22–25 )

Type material examined. Holotype male, ANGOLA: (A6), Tundavala, 9 mls. NW. Sa da Bandeira, 23.ii. 1972 / Southern African Exp., B.M.1972-1. Paratypes, 2 males (1 MNRJ), 2 females (1 MNRJ), same labels as holotype.

Diagnosis. Scutum and scutellum uniformly silver-grey pollinose from certain angles in male; female with three faint brown vittae; cercal plate very distinct, with long and curly hairs, and with 2 spines on ventral surface.

Description. ( Fig. 3 ) Ground-colour brown, uniformly grey pollinose from certain angles; head with frontal vitta dark brown; ocellar triangle silver pollinose; fronto-orbital plate, face, parafacial and gena silver pollinose; antenna dark brown, tip of pedicel grey pollinose; arista brown; palpus dark brown; scutum and scutellum uniformly silvery-grey pollinose from certain angles in male; female with three faint brown vittae; calypters white; haltere yellow; wing clear; legs dark brown, coxae with grey pollinosity; abdomen uniformly silvery-grey pollinose from certain angles, concolorous with thorax in male; female with brown spots and a median vitta on all tergites; cercal plate with 2 spines and 2 submedian structures on ventral view ( Fig. 24 ).

Male. Body length: 3.3 mm; wing length: 3 mm.

Head. Eye bare; frons very narrow; frontal row with 4 pairs of setae, and 1 pair of reclinate orbitals; inner and outer verticals short, similar in size; ocellars hair-like; antenna inserted at mid-level of eye, with postpedicel about twice the length of pedicel; arista plumose on basal half; palpus filiform.

Thorax. Acrostichal setulae short, in 4 rows, prescutellar pair not differentiated; dorsocentrals 1+3, all long, the last one longer; postpronotal 1, long; 1 presutural and 1 postsutural intra-alar, 1 postsutural supra-alar; 1 postalar; prealar absent; notopleuron with 2 setae, similar in size; anepisternum with a series of 4 long setae, 3 in the upper mid part and 1 posterior; 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 a complete row of setae on anterodorsal and posterodorsal surfaces; fore tibia with a long posterior median seta, 1 anterodorsal and 1 dorsal preapical, the anterodorsal very long and twice the length of the dorsal seta, 1 posterior, 1 posteroventral and 1 ventral apical, the last two longer than the dorsal seta and similar in size; mid femur with a row of short setae on basal half of anterodorsal surface, 2 anterior setae on middle third, one row of setae on basal two-thirds, 4–5 well-spaced posteroventral setae on basal two-thirds, and 1 anterodorsal and 1posterior preapical; mid tibia with 1 median posterodorsal and 1 median anteroventral, the latter longer, preapicals on dorsal, anterodorsal and posterodorsal surfaces, apicals on anteroventral, ventral and posteroventral surfaces; hind femur with an anterodorsal and an anteroventral row of setae, more spaced and fine on anteroventral surface; hind tibia with 1 anterior and 1 anterodorsal median setae, inserted at almost the same level, 1 long posterodorsal at apical third, 1 anteroventral and 1 ventral apical.

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 lateral pair of setae; tergites 4–5 each with a marginal row of setae. Sternite 1 bare. Sternite 5 “U” shaped ( Fig. 22 ).

Terminalia. Cercal plate as in Figs 23–24 ; with 2 spines and 2 submedian structures on ventral view ( Fig. 24 ); surstylus straight, curved at apex. Aedeagal complex as in Fig. 25 .

Female: Body length: 3.3 mm; wing length: 3.2 mm. Similar to male.

Etymology. The name refers to the 2 spines on the ventral surface of the cercal plate.

Discussion. C. setosa runs in Emden’s (1940) key to the C. semifumosa -group, and within this group it runs to C. semifumosa Stein , but C. setosa can be differentiated by the very peculiar male terminalia characters.

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.

FIGURES 19 – 25. (19 – 21) Coenosia planifrons Stein, male: (19) sternite 5, dorsal view; (20) cercal plate, dorsal view; (21) aedeagal complex, lateral view. (22 – 25) Coenosia setosa sp. nov., male: (22) sternite 5, dorsal view; (23) cercal plate, dorsal view; (24) cercal plate, ventral view; (25) male aedeagal complex, lateral view.