Myopella angustifrons Malloch, 1934

Michelsen, Verner, 2023, A reassessment of the Andean genus Myopella Malloch (Diptera: Anthomyiidae), Zootaxa 5336 (3), pp. 413-423 : 419

Myopella angustifrons Malloch, 1934

( Figs 1A, B , 2B , 3A–E , 6C, D , 7 )

Myopella angustifrons Malloch ; Malloch 1934: 198–199, fig. 31 ( Argentina); Pont 1974: 7.

Material examined. [ NHMD]: ARGENTINA: Río Negro: San Carlos de Bariloche, Cerro López , 1400m, 1♀ 31.xii.1978 (Mision Cientifica Danesa) . Tierra del Fuego: Lago Fagnano, Kalken, 100m, 14♁, 8♀ 19–24.i.1979 (Mision Cientifica Danesa); Estancia Haberton, 1♁ 25.i.1979 (Mision Cientifica Danesa) . Chubut: Escuel, La Hoya, 800–1350m, 1♀ 25.ii.1979 (Mision Cientifica Danesa) .

Diagnosis. Very dark due to extensive coverage of brownish black pruinosity; frontal and facial parts of head velvety brownish black, darkest on frontal vitta; prementum, thorax and abdomen with dark subshine, wing smoky dark brown, calypteres ochre brown; halter black. Acrostichals forming two regular rows of setae behind suture; two subequal intraalar setae; meron with some tiny, anterior-directed setulae beneath spiracle. Male. Frons on upper part decidedly narrower than ocellar tubercle, with linear fronto-orbital plates well separated by frontal vitta; fronto-orbital plates each without orbital setae and with 3 frontal setae; frontal vitta with a pair of interfrontal setae. Sternite V with long tapering posterior lobes; upper epandrium prominent, heel-shaped; surstyli slender throughout. Female. Frontal setae 3–4 pairs. Spermathecal ducts of normal length, very slender.

Distribution. Argentina ( Fig. 7 , black dots).

Figures

FIGURE 1. Myopella angustifrons Malloch (A, B), M. appendiculata (Stein) (C), males. Habitus (A); head, dorso-lateral view (B, C). Same scale for B and C.

FIGURE 2. Myopella appendiculata (Stein) (A), M. angustifrons Malloch (B), males. Sternites II–V (A); sternites I–V (B). Same scale for A and B.

FIGURE 3. Myopella angustifrons Malloch, male terminalia. Hypopygium, lateral (A), and caudal (B); pre- and postgonite (C); phallus (D); sternite V (E). Same scale. Setae omitted on epandrium in A and B.

FIGURE 6. Myopella appendiculata (Stein) (A, B), M. angustifrons (Malloch) (C, D), females. Ovipositor, flat mounted (A, C); spermathecae (B, D). Same scale for A, B and D.

FIGURE7. KnownrecordsofMyopella angustifronsMalloch (blackdots) andM.appendiculata(Stein) (bluedots)superimposed on a map of South America.