Hemixylota unicolor 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 : 57-59

Hemixylota unicolor Shannon & Aubertin, 1933

Fig. 78

Hemixylota unicolor Shannon & Aubertin, 1933: 148

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

Material examined. La Araucanía: 1♂, Rio Blanco, Malleco , II.1974, Leg. L. Peña ( CNC) ; 1♂, Malalcahuello , 31.XII.1982, Leg. A. Newton & M. Thayer ( CNC) ; Los Ríos: 1♂, Valdivia , 7.X.1990, Leg. E. Krahmer ( UACH) ; Los Lagos: Ensenada ( Shannon &Aubertin 1933) .

References. Shannon & Aubertin, 1933 (desc.); Stuardo, 1946: 126 (cat.); Hull, 1949b: 375 (desc.); Fluke, 1957: 112 (desc.); Etcheverry, 1963: 50 (cat.); Thompson et al., 1976: 121 (cat.); Thompson, 1999a: 334 (key).

World distribution. Chile.

Chilean distribution. From La Araucanía to Los Lagos región ( Fig. 79 ).

Altitudinal range. From coastal to precordillera ecosystems (5– 1,000 m.a.s.l.).

Biology and notes. Shannon & Aubertin (1933) described the holotype of Hemixylota unicolor based on specimens from “Ensenada” in Argentina. However, Ensenada is a locality in Chile belonging to the Puerto Varas municipality ( Hull 1949b; Thompson 1999a). Thus, we reclassified this species as endemic to Chile. The species is associated with the Valdivian evergreen and North Patagonian forest, which has been replaced by urbanization and plantation forestry. All biological and ecological aspects of this species are unknown.

Conservation status. EN under B2ab (iii) using AOO = 12 km 2 and three localities (or subpopulations); EOO = 19,513 km 2.

Figures

FIGURE 79. Distribution map of Flukea vockerothi Etcheverry, 1966 (black circles); Hemixylota unicolor Shannon & Aubertin, 1933 (green circles); Pia cyanea Philippi, 1865 (red circles) and Philippimyia cyanocephalus (Philippi, 1865) (blue circles) in Chile.

FIGURES 74–78. Flukea vockerothi Etcheverry, 1966: (74–75) visiting flowers of Eucryphia cordifolia Cav., Villarrica (photo by Soledad Gaete); (76) dorsal view (photo by Jorge de la Torre Aninat); (77) eggs (photo by Jorge de la Torre Aninat). Hemixylota unicolor Shannon & Aubertin, 1933: (78) lateral view (photo by Vicente Valdés). Scale bar = 1 mm.