Coenosia Meigen, 1826

Patitucci, Luciano Damian, Mulieri, Pablo Ricardo, Couri, Marcia Souto & Dominguez, Martha Cecilia, 2023, Phylogeny of the old and fragmented genus Austrocoenosia Malloch reveals new evidences on the morphology and evolution of the genera Coenosia Meigen and Neodexiopsis Malloch (Diptera: Muscidae), Arthropod Systematics & amp; Phylogeny 81, pp. 611-653 : 611

Coenosia Meigen, 1826

Type-species.

Musca tigrina Fabricius.

Synonymous list of generic names.

Caricea Robineau-Desvoidy, 1830; Limosia Robineau-Desvoidy, 1830; Palusia Robineau-Desvoidy, 1830; Oplogaster Rondani, 1856; Allognota Pokorny, 1893; Dexiopsis Pokorny, 1893; Centriocera Pokorny, 1893; Rhynchocoenops Bezzi, 1918; Tenuicosta Stein, 1919; Macrocoenosia Malloch, 1920; Austrocoenosia Malloch, 1934: 217. Type-species, Neodexiopsis nigerrima Malloch. syn. rest.; Hebdomostilda Enderlein, 1936; Mesodiplectra Enderlein, 1936; Psephidocera Enderlein, 1936; Diatinoza Enderlein, 1936; Platychiracra Enderlein, 1936; Adiplectra Enderlein, 1936; Trilasia Karl, 1936; Lamprocoenosia Ringdahl, 1945; Leucoenosia Ringdahl, 1945; Xanthorrhinia Ringdahl, 1945.

Diagnosis of the Coenosia aurifera group.

The Coenosia aurifera group is defined by the combination of the following characters: grey species, with grey or brownish-yellow pollinosity [except head of males of C. aurifera with golden pollinosity]; frons longer than wide; dorsocentrals 1+3, with an eaDC, that is usually less than one third or fifth of length of the aDC [except C. delneneo sp. nov., with eaDC is half (or more) of length of aDC]; mid tibia with one ad and one pd median setae; hind femur with one preapical ad and one pd [dorsal in some specimens of C. aurifera ] setae; hind tibia with one long ad seta and one fine av setae, a pd seta with variable length. Males can be characterized by tergite 6 and epadrium visible on dorsal view, and cercus longer than broad with strong spines. Female ovipositor presents tergite 6 with four plates.

The Coenosia aurifera group here proposed includes C. aurifera , C. delneneo sp. nov., and C. tarsata . This group seems to be biogeographically circumscribed to the Andean chains, especially to the Subantarctic sub-region and the south extreme of the Andean sub-regions.

Descriptions.

To avoid lengthy and redundant descriptions, the characters listed below are present in all species of C. aurifera group. - Male. Head: Dichoptic; eyes bare. 3-4 pairs of frontal setae, 1 pair of reclinate orbital setae. Frons longer than wide, frontal triangle not visible, with the same color of the frons [except female of C. aurifera with a visible triangle] (Fig. 7B ). Inner vertical setae strong and longer than outer vertical setae. Ocellar setae strong and long. Occiput with three rows of setae: a posterior row at dorsal middle of head, a central row complete, and an anterior row at ventral middle of head. Gena with black hairs, and with height greater than the width of the postpedicel. Antenna inserted at the mid-level of the eye in lateral view. Palpus filiform. Thorax: Without vitta; anterior and posterior spiracles grey. Chaetotaxy: intra-alars 1+2, posterior postsutural seta shorter; supra-alars 1+1; postpronotals 2; notopleurals 2. Prealar absent. Scutellum with one long basal and one long apical pair of setae, similar in size: katepisternals 1+1+1, forming an equilateral triangle; anepimeron, katepimeron, and meron bare, proepisternals 2; proepimeral 2, lower seta downcurved. Prosternum bare. Wing: Hyaline; veins bare, except costal vein; lower calypter glossiform, twice longer than the upper one. Tegula yellow. Halter yellow. Legs: Fore tibia with one median posterior seta. Mid femur with 2 preapical setae on pd to posterior surface. Hind femur with one preapical ad setae and one pd (dorsal in some C. aurifera specimens) setae. Hind tibia with one long ad seta, a long pd seta, and one shorter av setae. Similar sized claws and pulvilli of the three legs. Abdomen: Tergite 6 visible in dorsal and lateral view. Epandrium globose, wider than tergite 6 in dorsal view. Sternite 1 bare. Sternite 5 longer than broad with basal margin convex. Terminalia: Cercus longer than broad, sclerotized, with strong spine, and apical margin concave with 2 teeth strongly sclerotized. Surstyli longer than broad, straight, and curved at tip. Hypandrium tubular longer than wide, distal extreme exposing the phapod. Aedeagus with phapod straight, strongly sclerotized, and longer than hypd in lateral view; pregt developed, kidney-shaped, ventrally fused with the hypd; pgt developed, epiphalus slightly sclerotized, and distiph tubular, with a sclerotized ring at base and extending on dorsal surface to tip, and with a brush of fine hair on ventral surface. - Female. Ovipositor: Tergites 6 with two long and wide sclerotized plates and two square plates, epiproct with “boomerang” shape, with hair-like setae, shorter than cercus; hypoproct triangular, setulose, with several strong setae on distal margin.

Figures

Figure 7. Coenosia aurifera, female. A Lateral view, B head, frontal view, C spermathecae, D ovipositor, dorsal view, E ovipositor, ventral view. Scale bar: 1 mm (A), 0.2 mm (B, D-E), 0.1 mm (C).