Gondwanamyia chilensis Cumming & Saigusa

Sinclair, Bradley J., Cumming, Jeffrey M., Brooks, Scott E., Plant, Adrian R. & Saigusa, Toyohei, 2016, Gondwanamyia, a new empidoid (Diptera) genus of uncertain placement, ZooKeys 621, pp. 137-147 : 140-141

Taxon classification Animalia Diptera Empididae

Gondwanamyia chilensis Cumming & Saigusa sp. n. Figs 4-5, 6, 8, 9, 11

Type locality.

Chile: Los Lagos (Region X), Osorno Province, Puyehue National Park, Antillanca [ca. 40°46'S 72°12'W], 1300 m, Nothofagus , tree line.

Type-specimen.

Holotype male, pinned. Original label: "CHILE: Osorno, Puyehue/ N.P. Antillanca 1300m/ Feb. 11, 1988/ Nothofagus , tree line/ L. Masner, Chile Exp"; "HOLOTYPE/ Gondwanamyia / chilensis / Cumming & Saigusa" [red label] (CNC). Paratypes: CHILE. Los Lagos (Region X). Chiloé Province: Chiloe Is., Ahoni Alto [ca. 42°46'S 73°34'W], 70 m, iv.1988, L. Masner (1 ♂, CNC). Llanquihue Province: N. Correntoso [ca. 41°26'S 72°35'W], N.E. Peurto Montt, vi-vii.1989 (2 ♂, 1 ♀, CNC). Osorno Province: Puyehue NP, Anticura [ca. 40°39'S 72°16'W], 250 m, Nothofagus , 12.ii.1988, L. Masner (15 ♂, 12 ♀, CNC); Puyehue NP, 1300 m, Antillanca [ca. 40°46'S 72°12'W], Nothofagus , tree-line, 11.ii.1988, L. Masner (18 ♂, 4 ♀, CNC). Los Ríos (Region XIV). Valdivia Province: 4.1 km W Anticura, 270 m, 19-25.xii.1982, A. Newton & M. Thayer (5 ♂, 5 ♀, KUMF); 30 km W La Union, Las Trancas, Nothofagus , 500 m, 7-8, 25.ii.1988, L. Masner (2 ♂, 2 ♀, CNC). Aysén del General Carlos Ibáñez del Campo (Region XI). Rio Gualas Sipi, Pto Gualas [ca. 46°31'S 73°42'W], 16.ii.1986, yellow pan traps in dense rainforest, N.A. Deans (1 ♀ in alc., NMWC).

Additional material examined.

CHILE. Los Lagos (Region X). Osorno Province: Puyehue NP, Volcan Casablanca [ca. 40°43'S 71°57'W], 1370 m, nr. snowline, A. Newton & M. Thayer (1 ♂, CNC).

Recognition.

This species is distinguished from Gondwanamyia zealandica by the male mid femur and tibia with stout posteroventral setae, mostly membranous epandrium + hypandrium, and long phallic filament.

Description.

Male.Head: Ocellar setae stout, reclinate. Arista-like stylus slightly longer than 0.5 mm.

Thorax: Brown, darker than abdomen. Acrostichals absent; six dorsocentral setae; one postpronotal seta, two notopleural setae, upper longer and stouter; one presutural and two postsutural supra-alar setae; one postalar, elongate, subequal in length to apical scutellar seta; two pairs of scutellar setae, lateral pair slender and shorter than apical pair.

Legs: Mid femur with posteroventral row of 10-11 stout setae, longer than width of tibia (Fig. 5). Mid tibia with posteroventral row of apically-directed stout setae. Apex of hind tibia broadly expanded with posteroapical comb.

Wing (Fig. 4): Length 1.2-1.5 mm. Erect costal setae less conspicuous than in Gondwanamyia zealandica ; faint subapical vein streaks present, representing veins M1 and M2.

Abdomen: Two pairs of posterior setae on male sternite 8 short and slender. Male terminalia (Fig. 6): Cercus slender, apical half narrow and parallel-sided, bearing short, slender setae. Hypandrium + epandrium mostly membranous; slender epandrial lobe anterior, parallel with cercus, lacking setae, apex of lobes united medially; base of lobe and cercus continuous as dark, slender sclerite arching posteriorly to articulate with base of hypandrium. Hypandrium sheath-like, encircling base of phallus; gonocoxal apodeme slender, arched posteriorly, arising along interior of hypandrial sheath. Phallus with elongate apical filament, 3 × longer than length of hypandrial sheath; ejaculatory apodeme rod-shaped, with expanded apex, articulated at base of phallus.

Female. Similar to male, except posteroventral row of stout setae on mid femur and tibia absent. See genus description for details of female terminalia (Figs 8, 9).

Etymology.

The species name refers to the country of the type locality.

Remarks.

This species is confined to southern Chile (Fig. 11) where it is found in mostly damp temperate Nothofagus habitats from lowlands to tree line. All specimens were collected with yellow pan traps, except the Newton & Thayer sample, which was collected with a flight-intercept trap.