Euthycerina Malloch, 1933

Mortelmans, Jonas & Hendrix, Jef, 2020, Review of Euthycerina Malloch (Diptera, Sciomyzidae), with description of a new species from Chile, Zootaxa 4786 (3), pp. 381-395 : 393-394

Key to species of Euthycerina Malloch

1 Arista relatively short haired ( Fig. 8c ); color of scutum light, brownish, and heavily infuscated with five longitudinal pubescent stripes ( Fig. 7c ); frontal vitta wide ( Fig. 4c ); in male, ventral processes of tergite 5 in ventral view with subapical process, almost bifid ( Figs. 6 e–h)....................................................................... E. vittithorax

- Arista relatively long haired ( Figs. 8a, b ); color of scutum dark, pubescence light or heavy, arranged as two broad longitudinal stripes and one medial longitudinal stripe ( Fig. 7a, b ); frontal vitta wide or narrow ( Fig. 4a,b ); in male, ventral processes of tergite 5 in ventral view without subapical process ( Figs. 6 a–d, 6g–i)............................................ 2

2 Knob of halter dark ( Fig. 5a ); cell r 1 dark and devoid of spots, if these spots present, very small and always much narrower than half the height of cell r 1, ( Fig. 3a ); occiput black and thoracic pleura dark ( Fig. 5a ); surstyli short, broad and heavy (stocky) ( Figs. 6 g–i); in male, ventral process of tergite 5 in lateral view smoothly curved and abruptly bent posteriorly ( Figs. 6 g–i); frontal vitta wide ( Fig. 4a ); pubescence of scutum very dense ( Fig. 7a )..................................... E. uachi

- Knob of halter yellow ( Fig. 5b ); cell r 1 dark with multiple spots reaching both anterior and posterior margins ( Fig. 3b ); occiput and thoracic pleura yellow ( Fig. 5b ); surstyli elongated and slender ( Figs. 6 a–d); in male, ventral process of tergite 5 in lateral view smoothly curved and gradually bent posteriorly ( Figs 6 a–d); frontal vitta narrow ( Fig. 4b ); pubescence of scutum very light ( Fig. 7b )................................................................................. E. pilosa

Figures

FIGURE 3. Wings of (A) the male holotype E. uachi, (B) the male paratype E. pilosa, and (C) the male paratype of E. vittithorax.

FIGURE 4. Head in dorsolateral view of (A) the male holotype of E. uachi, (B) a male specimen of E. pilosa, and (C) the male paratype of E. vittithorax. Because we had no type material of E. pilosa that included a head, a typical specimen was chosen for this photograph. In addition to the frontal vitta, note the arista, the back of the head, and the color of the scutum, all of which are diagnostic characters.

FIGURE 5. Habitus in lateral view of (A) the male holotype of E. uachi, (B) the male paratype of E. pilosa, and (C) the male paratype of E. vittithorax.

FIGURE 6. Male terminalia of (A–D) the male paratype of E. pilosa; (E–H) the male paratype of E. vittithorax; (I–L) the male holotype of E. uachi. Male terminalia, posterior view (A, E, I); male terminalia, lateral view (B, F, J); male tergite 5, lateral view (C, G, K); male tergite 5, ventral view (D, H, L). Each facet on a row is drawn on the same scale, and the corresponding scale bars indicate 0,5mm.

FIGURE 7. Dorsal view of the mesonotum of the male holotype of E. uachi (A), the male paratype of E. pilosa (B), and the male paratype of E. vittithorax (C). Scale bar same for all three specimens: 1mm.

FIGURE 8. Lateral view of the antennae of the male holotype of E. uachi (A), the male paratype of E. pilosa (B), and the male paratype of E. vittithorax (C).