Styringomyia

Ribeiro, Guilherme Cunha, 2003, Systematics of the Neotropical species of Styringomyia Loew (Diptera: Tipulomorpha: Limoniidae), Zootaxa 253, pp. 1-35 : 10-11

Key to the males of Neotropical Styringomyia species

(based on the morphology of the gonostylus)

1. Stout spine­like hairs present ( Figs. 10­13 )................................................................... 2

­ Stout spine­like hairs absent ( Figs. 14­17 ).................................................................... 5

2. Gonostylus much longer than broad, bearing two long spine­like hairs; extension I greatly developed, basal in position ( Figs. 10, 11 )........................................................ 3

­ Gonostylus almost as long as broad, bearing at least three short spine­like hairs; exten­ sion I apical in position ( Figs. 12, 13 )........................................................................... 4

3. Four extensions present; apex of extension I broad ( Fig. 10 ) ....... S. mystica Alexander

­ Only three extensions present; apex of extension I narrowed ( Fig. 11 ) .. S. youngi sp. n.

4. Extension II short, spine­like hair situated at its apex ( Fig. 12 ) .......... S. atlantica sp. n.

­ Extension II long, spine­like hair situated at its base ( Fig. 13 ) ..... S. paulista Alexander

5. Two apical extensions present....................................................................................... 6

­ Only one bifid apical extension present (probably resulting from the fusion of exten­ sion III and IV); anterior margin of gonostylus almost straight; slender hairs in the lat­ eral face concentrated at a protuberance near base of apical extension ( Fig.

16)................................................................................................... S. amazonica sp. n. ­ Three apical extensions present; extension III and IV closely jointed; gonostylus long and slender ( Fig. 17 ) ......................................................................... S. manauara sp. n.

6. Gonostylus more or less S­shaped; extension III relatively poorly developed; medial face with a long and relatively stout hair near base of extension IV ( Fig. 14 ) ............... ....................................................................................................... S. simplex Alexander

­ Gonostylus constricted at base; distal part of posterior margin expanded; extension III well developed ( Fig. 15 ) ........................................................................... S. maya sp. n.

Figures

FIGURES 10 ­ 13. Gonostylus of Neotropical Styringomyia species. Lateral and medial faces, respectively, on left and right sides of each figure. 10. S. mystica, holotype. 11. S. youngi sp. n., paratype. 12. S. atlantica sp. n., holotype. 13. S. paulista, holotype. The numbers refers to the homology system applied to the extensions of the gonostylus.

FIGURES 14 ­ 17. Gonostylus of Neotropical Styringomyia species. Lateral and medial faces, respectively, on left and right sides of each figure. 14. S. simplex, holotype. 15. S. maya sp. n., specimen from Ecuador (Manabi, Palmar). 16. S. amazonica sp. n., specimen from Ecuador (Francisco de Orellana). 17. S. manauara sp. n., paratype. The numbers refers to the homology system applied to the extensions of the gonostylus.