Coenosia lucens, 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 : 503-506

Coenosia lucens sp. nov.

( Figs 1, 4–6 )

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, same labels as holotype: 10 males (2 MNRJ, 1 OUMNH), 18 females (1 MNRJ, 1 OUMNH); 5.ii.1972, 4 females; 8–10mls. NW Sa da Bandeira, 27–29.iii.1972, 5 females (1 MNRJ); (A28) c. 6600’/ 14 50’S, 13 25’E, 4–5.iii.1972, 1 male, 2 females.

Diagnosis. Ground-colour brown to dark brown, very shiny, with some grey pollinosity especially on pleura ( Fig. 1 ); scutum when viewed from the front with sparse grey pollinosity on postpronotum and a median vitta before the suture, more or less covering the acrostichals; arista long; thorax with very few ground-setulae; dorsocentrals 1+3, the first three hair-like and the last (prescutellar) long and well-developed; the posterodorsal preapical seta on fore tibia, as long as the median posterior seta; sternite 5 “U”shaped; surstylus curved (not visible in dorsal view) with 2 spines at apex; distiphallus large and membranous.

Description. Ground-colour brown to dark brown, very shiny, with some grey pollinosity especially on pleura ( Fig. 1 ); scutum when viewed from the front with sparse grey pollinosity on postpronotum and a median vitta before the suture, more or less covering the acrostichals; head with frontal vitta brown to dark brown (some males with lunule light brown); ocellar triangle and fronto-orbital plate shiny brown; face, parafacial and gena grey pollinose; antenna dark brown, pedicel with grey pollinosity; arista and palpus brown; posterior part of head grey pollinose; scutum and scutellum entirely brown, shiny; notopleuron and all pleura grey dusted; calypters white; haltere pale yellow; wing clear; legs brown, shiny; abdomen brown, shiny, with grey pollinosity on syntergite 1+2 laterally and on epandrium.

Male. Body length: 2.1–2.3 mm; wing length: 2.2–2.4 mm.

Head. Eye bare; frons at vertex about one-third of head-width; frontal row with 4 pairs of fine setae, and 1 pair of reclinate orbitals; inner vertical and ocellar setae long and fine, similar in size; outer vertical very long and fine; antenna inserted at mid-level of eye, with postpedicel about 2.4–2.7 times the length of pedicel; arista long, with short, fine hairs on basal third; gena very narrow; palpus filiform.

Thorax. With very few ground-setulae; acrostichal setulae very fine, in 2 rows, prescutellar pair not differentiated; dorsocentrals 1+3, the first three hair-like and the last (prescutellar) long and well-developed; postpronotum with fine hairs, without differentiated setae; 1 presutural and no postsutural intra-alar, 1 postsutural supra-alar; 1 postalar; prealar absent; notopleuron with 2 setae, similar in size; anepisternum with a series of 4 setae, the anterior and the posterior ones long; katepisternals 1+1+1, arranged in an equilateral triangle. Scutellum with 1 long basal and 1 long apical pair of setae and with fine hairs on disc.

Legs. Fore femur with a complete row of posterodorsal setae and 4 long, well-spaced posteroventral hairs on basal and middle thirds; fore tibia with a long posterior median seta, dorsal and posterodorsal preapicals, the latter as long as the median posterior seta, and 1 preapical posteroventral inserted basad relative to the other two; mid femur with 2 long anterior setae on middle third, 4 long well-spaced posteroventral hairs on basal and middle thirds and 2 posterior preapicals; mid tibia with 1 long median anterior and posterior setae, preapicals on anteroventral and posteroventral surfaces and 1 ventral apical; hind femur with an anterodorsal row of about 5 well-spaced setae and an anteroventral row with about 4 well-spaced setae; hind tibia with 1 long anterior and 1 longer posterodorsal above middle, 1 anterodorsal and one posterodorsal on apical third, the posterodorsal inserted slightly above the anterodorsal, apicals on ventral and anteroventral surfaces.

Wing. Veins bare; veins M and R4+5 parallel at wing-tip; upper calypter very short and lower one long, about 4 times the length of the upper one; haltere with the knob large.

Abdomen. Compressed ventrally; syntergite 1+2 with a row of lateral setae; tergites 3–5 each with 1 lateral pair of setae; tergite 5 with two median setae inserted close to the margin of tergite 4. Sternite 1 bare. Sternite 5 “U”shaped ( Fig. 4 ).

Terminalia. Cercal plate as in Fig. 5 ; surstylus curved with 2 spines at apex ( Fig. 6 ). Aedeagal complex as in Fig. 6 ; distiphallus large and membranous.

Female: Body length: 2.3–2.5 mm; wing length: 2.4–2.5 mm. Similar to male.

Etymology. The specific name is from the Latin “ lucens ”, meaning “bright”, and refers to the shining general colour of the body.

Discussion. This is a very peculiar species with a characteristic colour pattern and scutal chaetotaxy. It runs in Emden’s (1940) key to the C. semifumosa -group and within this group runs to C. megalocalyptra (Emden) , which is also a very peculiar species with a very well developed lower calypter that reaches to third abdominal segment in male.

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.