Austroscaeva occidentalis ( Shannon, 1927 )

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 : 119

Austroscaeva occidentalis ( Shannon, 1927)

Fig. 172

Syrphus sexmaculata Macquart, 1850: 457

Scaeva occidentalis Shannon, 1927: 29

Syrphus chilensis Goot, 1964: 214

Type locality and data. “ Santiago, Chile ” (T, ♂, USNM) .

Material examined. Tarapacá: 1♂, Chijo, Iquique , 26.V.1986, Leg. S. Cerda ( MNHNCL) ; Antofagasta: 1♂, Tilomonte , 6.II.1997, Leg. V. Jérez ( MZUC) ; 1♂, 1♀, Estero Vilama , 17.XII.1997, Leg. M. Hengst & J.C. Ortiz ( MZUC) ; Coquimbo: 2♂, 1♀, Chañaral de Aceituno , 24.X.1957, Leg. L.E. Peña ( CNC) ; Puerto Oscuro, Canela , 24.X.1961, Leg. L.E. Peña ( Dušek & Láska 1985) ; Valparaíso: 1♀, Bosque Relicto, Quintero , 8.IX.1966, Leg. C. Vivar ( MNHNCL) ; 1♂, El Granizo, 11.XII.1964, Leg. Hichins ( MNHNCL) ; 1♂, Marga Marga , 11.X.1980, Leg. NN ( MNHNCL) ; Metropolitana : 1♂, Cuesta La Dormida , 16.I.1964, Leg. Cerda ( MNHNCL) ; 1♂, Caleu, TilTil , 15.X.1994, Leg. Cerda ( MNHNCL) ; 1♀, Ñuñoa , 12.X.1986, Leg. M. Cerda ( MNHNCL) ; 1♂, Cerro Cantillana , 7.X.1972, Leg. Cerda ( MNHNCL) ; O’Higgins: La Cruz, 10.II.1966, Leg. Marnef ( Dušek & Láska 1985) ; Maule: 9♂, 7♀, Fundo Malcho , XI.1956, Leg. L.E. Peña ( CNC) ; 1♀, Curanipe , 4.XII.1953, Leg. L.E. Peña ( CNC) Biobío: 2♂, Concepción, 18.XII.1961, Leg. Méndez ( MZUC) ; 1♀, Penco , 6.X.1969, Leg. J.C. ( MZUC) ; 1♀, Cañete , 24.I.1975, Leg. Cerda ( MNHNCL) ; La Araucanía: 1♂, Parque Nacional Nahuelbuta , 20.I.1988, Leg. P. Cerda ( MNHNCL) ; 2♀, Pillem Pilli , 18.I.1954, Leg. L.E. Peña ( CNC) ; 1♂, Lican Ray , 25.II.1988, Leg. Cerda ( MNHNCL) ; Galletué , 1200 m, 14.XII.1963, Leg. L.E. Peña ( Dušek & Láska 1985) .

References. Shannon, 1927: 29 (desc.); Shannon & Aubertin, 1933: 129 (desc.); Stuardo, 1946: 123 (cat.); Fluke, 1956: 214 (cat.); Etcheverry, 1963: 11 (cat.); Boyes et al., 1973: 371 (karyotypes); Thompson et al., 1976: 9 (cat.); Dušek & Láska, 1985: 221 (desc.); Kassebeer, 1999: 99, figs 4a–4d (key & desc.); Montoya, 2016: 478 (cat.); Marín-Armijos et al., 2017: 177 (cat.); Mengual et al., 2018a: 161 (desc. & phylogeny).

World distribution. Argentina, Colombia and Chile.

Chilean distribution. From Tarapacá to La Araucanía region ( Fig. 175 ).

Altitudinal range. From coastal to highland ecosystems (40– 3,750 m.a.s.l.).

Biology and notes. This flower fly species has been recorded visiting different plant species such as Azorella compacta Phil. (Michael Weymann, CSP record); Calendula officinalis L. (Mila Val, CSP record); Encelia canescens Lam (Rodrigo Barahona-Segovia, pers. obs.); E. pectinatus (Peter Lewis, CSP record); Orizoë sp. (Daniel Llavaneras, CSP record); Senecio sp. (Ana María Gutiérrez, CSP record). Other aspects of its biology and ecology remain unknown in Chile.

Conservation status. LC; EOO = 730,507 km 2, AOO = 108 km 2 and 26 localities (or subpopulations).

Figures

FIGURE 175. Distribution map of Austroscaeva species in Chile: Austroscaeva melanostoma (Macquart, 1842) (blue circles); Austroscaeva occidentalis (Shannon, 1927) (red circles); Austroscaeva patagoniensis (Kassebeer, 1999) (black circles) and Austroscaeva penai (Marnef in Dušek & Láska, 1985) (green circles).

FIGURES 171–172. Austroscaeva melanostoma (Macquart, 1842): (171) visiting Euryops pectinatus (L.) Cass, Santiago (photo by Gabriela Germain), and (172) Austroscaeva occidentalis (Shannon, 1927) visiting a flower of Orizoë sp., Ocoa (photo by Daniel Llavaneras).