Chamaesphegina argentifascies Shannon & Aubertin, 1933

Barahona-Segovia, Rodrigo M., Riera, Pamela, Pañinao-Monsálvez, Laura, Guzmán, Vicente Valdés & Henríquez-Piskulich, Patricia, 2021, Updating the knowledge of the flower flies (Diptera: Syrphidae) from Chile: Illustrated catalog, extinction risk and biological notes, Zootaxa 4959 (1), pp. 1-178 : 23-24

Chamaesphegina argentifascies Shannon & Aubertin, 1933

Figs 20–21

Chamaesphegina argentifascies Shannon & Aubertin, 1933: 145

Type locality and data. “ Ensenada , Argentina ” (T, ♀, BMNH) .

Material examined. Maule: 2♂, Reserva Nacional Los Queules , 27.XI.2017, Leg. R. Barahona-Segovia ( PCRBS) ; Biobío: 1♀, Caramavida , 1. I.1954, Leg. L. Peña ( CNC) ; La Araucanía: 1♂, Río Blanco, Malleco , II.1964, Leg. L. Peña ( CNC) ; 1♂, Termas de Palguín , no data, Leg. Etcheverry ( MNHNCL) ; Los Ríos: 1♀, Valdivia , 16.XII.1980, Leg. E. Krahmer ( UACH) ; Los Lagos: 2♂, 2♀, Pucatrihue , 4–21.II.1967, Leg. L.E. Peña ( MEUC) ; Lago Chapo , 28.II.1983, Leg.Arriagada ( MNHNCL) ; 1♂, Parque Nacional Puyehue , 7.XI.1968, Leg. ( MNHNCL) ; 2♀, El Chinque, North Correntoso , 1.I.1990, Leg. J. R. Vockeroth ( CNC) ; 2♀, Senda Darwin Biological Station , 13–16.II.2016, Leg. Cecilia Smith-Ramírez ( CSD) ; Aysén: 1♀, Puerto Cisnes , 16.II.1961, Leg. L. Peña ( CNC) .

References. Shannon & Aubertin, 1933: 145 (desc.), fig. 28 (head, frontal), fig. 29 (wing); Stuardo, 1946: 125 (cat.); Hull, 1949b: 339 (key, rev. & evolution); Fluke, 1957: 56 (rev.); Thompson, 1972b: 123, fig. 23 (wing) ( Milesiinae rev.); Thompson et al., 1976: 46.91 (cat.); Thompson, 1999a: 333 (key); González & Coscarón, 2005: 347 (distr.).

World distribution. Argentina and Chile.

Chilean distribution. From Maule to Aysén region ( Fig. 28 ).

Altitudinal range. From coastal to highland ecosystems (5– 2,240 m.a.s.l.).

Biology and notes. Chamaesphegina argentifascies is associated with Laurelia sempervirens (Ruiz & Pav.) Tul in the Reserva Nacional Los Queules (Rodrigo Barahona-Segovia pers. obs.) and E. cordifolia trees in Chiloé Island (Rodrigo Barahona-Segovia and C. Smith-Ramírez, pers. obs.). The locality Ensenada in the type locality, belongs to the Puerto Varas municipality in Chilean territory and therefore, we considered this as an error in the geographic assignation of the type locality. This species, especially in central Chile and Valdivian forest has lost the larger extensions of native habitat by human being activities ( Miranda et al., 2017).

Conservation status. VU under B2ab (iii) using AOO = 40 km 2 and ten localities (or subpopulations); EOO = 99,655 km 2.

Figures

FIGURE 28. Distribution map of Austroascia segersii Thompson & Marnef, 1977 (red circles); Chamaesphegina argentifascies Shannon & Aubertin, 1933 (blue circles); Notiocheilosia nitescens Shannon & Aubertin, 1933 (black circles); Orthonevra chilensis Thompson, 1999 (green circles) and Sphiximorpha barbiger (yellow circles) in Chile.

FIGURES 20–25. Chamaesphegina argentifascies Shannon & Aubertin, 1933: (20) male, dorsal view; (21) male, lateral view. Scale bars = 1.2 mm (photos by Vicente Valdés). Chamaesphegina macra: (22) male, dorsal view and (23) lateral, view (photo by Zöe Simmons; ZMHB). Scale bars = 1 mm. Notiocheilosia nitescens Shannon & Aubertin, 1933: (24) lateral view and (25) dorsal view. Scale bars = 1 mm (photos by Vicente Valdés).