Coenosia argentifrons (Malloch, 1934)

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 argentifrons (Malloch, 1934)

Male.

Thorax: (Fig. 13A, C ). Chaetotaxy: dorsocentrals 1+3, eaDC is less than one fifth of the aDC. Katepisternum with 2-3 setulae. Abdomen: (Fig. 13D ). Grey with sub-triangular lateral dark-brown marks on tergites 3-5. Tergite 6 poorly visible in dorsal view. Sternite 5 with similar wide and length, apical margin concave with “V” shape; setae long on all the plate (Fig. 13E ). Terminalia: Cercus, curved in lateral view, keels placed from distal to apical margin, apical margin straight. Surstyli longer than broad, straight (Fig. 13F, G ). Hypandrium tubular longer than wide, distal extreme exposing the phallapodema. Aedeagus with pregt developed; pgt developed; epiphalus slightly sclerotized, and distiph tubular, and slightly sclerotized at base, and without fine hair on ventral surface (Fig. 13G, H ). - Female: Unknown.

Type material.

Holotype. Male; BMNH [pinned, glued on card, in good condition]. Original labels: "♂ [handwritten] / Holo- / type [printed]" on white circular paper, red frame; "Argentina: / Terr. Rio Negro. / F.& M. Edwards / B.M. 1927-63." printed on white paper; "Bariloche: / 25-28.x.1926." printed on white paper; " Austrocoenosia / Austrocoenosia argentifrons / Type [handwritten] / det. JRMALLOCH [printed]" on white paper, black frame. https://data.nhm.ac.uk/object/52fe9b69-4be6-4b8b-b54c-5683508ac9d9/1678924800000

Additional material examined.

ARGENTINA - Chubut province • 81 males; PNLA, Cabana La Cascada ; -42.888499, -71.592376; 532 m a.s.l.; Feb 2013; Olea, Mulieri & Patitucci leg.; Malaise trap; MACN ; • 6 males; PNLA, Lago Verde ; -42.717506, -71.725197; 539 m a.s.l.; 24 Oct 2014; Patitucci leg.; MACN • 13 males; PNLP, Gendarmería; -42.097468, -71.681953; 200 m a.s.l.; 07-11 Jan 2012; Mulieri & Patitucci leg.; Malaise trap; MACN ; • 1 male; PNLP, Intendencia ; -42.085077, -71.614662; 12 Jan 2011; Mulieri & Patitucci leg.; MACN • 1 male; PNLP, La Playita ; -42.099032, -71.607425; 205 m a.s.l.; 09 Jan 2012; Patitucci leg.; MACN • 1 male; PNLP, Rio Azul ; -42.0916, -71.6155; 17 Jan 2011; Mulieri leg.; MACN • 3 males, same locality; 13 Jan 2012; -42.0908, -71.6247; Mulieri & Patitucci leg.; MACN . - Neuquén province • 1 male; ABM, -38.845457, -71.093002; 1400 m a.s.l.; Jan 2013; Mulieri & Patitucci leg.; MACN • 3 males; ALE; -36.816253, -71.081845; 1502 m a.s.l.; 12 Feb 2018; Mulieri & Patitucci leg.; MACN • 2 males; AVD, Aguas Calientes ; -36.678063, -70.606343; 1760 m a.s.l.; 13 Feb 2018; Patitucci leg.; MACN • 3 males; Las Ovejas ; -36.992243, -70.749499; 1260 m a.s.l.; 13 Feb 2018, Patitucci & Compagnucci leg.; MACN • 7 males; Pampa Lonco Luan, Ruta 13; -38.897919, -70.890376; 1522 m a.s.l.; 09 Feb 2018; Patitucci leg.; MACN • 1 male; Primeros Pinos ; -38.891693, -70.652192, 08 Feb 2018; Patitucci leg.; MACN 1 male; PNL, Laguna Pudu-Pudu ; -40.364956, -71.468841; 1000 m a.s.l.; Feb 2013; Mulieri leg.; MACN • 8 males; PNL, Ñorquinco; -39.146931, -71.232717; 1070 m a.s.l.; 09 Jan 2013; Olea, Mulieri & Patitucci leg.; Malaise trap; MACN ; • 2 males; PNL, Seccional Bandurrias ; -40.144240, -71.342986; 864 m a.s.l.; Feb 2013; Mulieri & Patitucci leg.; Malaise trap; MACN • 1 male; San Martín de los Andes, Truran Kura ; 18 Oct 1986, Gentilli leg.; IFML • 1 male; Villa Pehuenia ; -38.884694, -71.166337; 1170 m a.s.l.; Feb 2018, Patitucci leg.; MACN . - Río Negro province • 17 males; PNNH, Mallin Playa Negra ; -41.357809, -71.571683; 797 m a.s.l.; 19 Jan-05 Feb 2009; Garré & Montes de Oca leg.; MLP; Malaise . CHILE - Región de Coquimbo • 2 males; Valle dos Piuquenes, -30.4333, -70.4167; 7-12 Feb 1964; Peña leg.; MNRJ . - Región Metropolitana de Santiago • 1 male; Quebrada de La Plata , La Rinconada; 25-29 Dec 1966; Stange leg.; IFML .

Distribution (Fig. 27A).

ARGENTINA: Chubut (new record), Neuquén (new record), Río Negro. CHILE: R. de La Araucanía, R. de Coquimbo, R. Metropolitana de Santiago (new record).

Remarks.

Malloch (1934) described C. argentifrons from several specimens from Argentina and Chile. This species can be distinguished from its congeners by the striking silver front (Fig. 13B ). Later, Couri and Nuñez (2001) provided a complete redescription with details of male terminalia, and observed, for the first time, longitudinal median keels in the cercus. Our observations also showed this particular structure (keels) in all the species of the C. argentifrons group.

Figures

Figure 13. Coenosia argentifrons, male. A Lateral view, B head, frontal view, C thorax, dorsal view, D abdomen, dorsal view, E fifth sternite, F cercus, dorsal view, G cercus, surstylus and phallic complex, lateral view, H phallic complex, lateral view. Scale bar: 1 mm (A), 0.5 mm (B-G), 0.02 mm (H).