Coenosia brevicornis (Malloch, 1934) new comb.

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 brevicornis (Malloch, 1934) new comb.

Female. (Fig. 14A).

Length. Body: 3.44 mm, wing: 3 mm. Head (Fig. 14B ): Frons at vertex about one third of the head width. Frons black with brownish pollinosity; fronto-orbital plate, parafacial and gena black with grey pollinosity; 4 pairs of frontal setae. Frons longer than wide, with frontal triangle short, light grey, not reaching lunula. Gena with similar height to the width of the postpedicel. Antenna black, apex of pedicelum yellow, apical angle of postpedicel acute; in lateral view inserted at the mid-level of the eye; arista swollen at base, with his longest hairs hardly longer than its basal diameter. Thorax: (Fig. 14C ). Black with grey pruinescent, with two brown vitta along dorsocentral setae and intra-alar setae; anterior and posterior spiracles grey. Chaetotaxy: acrostichals irregular; dorsocentrals 1+3, eaDC is half of length of the aDC. Katepisternum with 3 setulae. Wing: Tegula yellow. Both calypters hyaline with white margins; halter yellow. Legs: Fore femur black with yellow apex, mid and hind femora yellow with a black band at apical third, tibiae yellow, tarsus black. Fore femur with a row of dorsal, posterior, pv, and an av row at basal half. Mid femur with 5-6 setae on anterior surface on basal half, 2-3 pv and 2-3 av setae on basal third, 2 preapical setae on pd to posterior surface; mid tibia with one long ad seta and one short pd median seta, ad seta positioned below of the pd seta. Hind femur with a row of ad and a row of av setae, 3 pv setae on basal third. Similar size of claws and pulvilli of the three legs. Abdomen: Grey, tergites 3-4 with two brown spots and tergites 3-5 with a thin central longitudinal stripe. Ovipositor: Tergites 6 and 7 with two parallel sclerotized plates, tergite 8 with two short and round sclerotized plates over distal margin; epiproct triangular, with hair-like setae, shorter than cercus (Fig. 14D ). Sternites 6 and 7 with one central sclerite; sternite 8 divided into two small and linear sclerotized plates, each with setulae on distal margin; hypoproct triangular, setulose (Fig. 14E ). Spermathecae (Fig. 14F ).

Type material.

Holotype. Male; BMNH [pinned, glued on card, fore legs missing]. Original labels: "♂ [handwritten] / Holo- / type [printed]" on white circular paper, red frame; "Chile: / Chiloe I. / F.& M. Edwards / B.M. 1927-63." printed on white paper; "Ancud. / 17-19.xii.1926." printed on white paper; " Austrocoenosia / Austrocoenosia brevicornis / Type [handwritten] / det. JRMALLOCH [printed]" on white paper, black frame. https://data.nhm.ac.uk/object/8ffc5add-f61d-4dca-949b-600039c04740/1678924800000

Additional material examined.

ARGENTINA - Chubut province • 1 female; PNLA, Lago Verde ; -42.717506, -71.725197; 539 m a.s.l.; 24 Oct 2014; Mulieri leg.; MACN .

Distribution (Fig. 27D).

ARGENTINA: Chubut (new record). CHILE: R. de los Lagos.

Remarks.

Coenosia brevicornis was described by Malloch (1934) with a single male specimen from Ancud, Chile. Some structures, such as one eaDC with half the length of the aDC, the coloration of the legs, and the profile of the head, allow distinguishing C. brevicornis from its congeners. After the original publication, a new combination, Neodexiopsis brevicornis , was established by Pont (1972). During our sampling campaigns, we collected only one female specimen with the same characters that distinguish C. brevicornis from its congeners and that are consistent with the general morphology of the male holotype. In addition, the female specimen possesses an erythrocyte-shape spermatheca, similar to that observed in all species of the C. argentifrons group. We propose the new combination.

Figures

Figure 14. Coenosia brevicornis, female. A Lateral view, B head, frontal view, C thorax, dorsal view, D ovipositor, dorsal view, E ovipositor, ventral view, F spermathecae. Scale bar: 1 mm (A), 0.2 mm (B), 0.5 mm (C-D), 0.1 mm (E). Sixth, seventh, and eighth sternites - red arrows.