Schizonyxhelea zoologica, Huerta & Grogan, 2017

Huerta, Herón & Grogan, William L., 2017, New species and new records of predaceous midges in the genera, Schizonyxhelea Clastrier and Stilobezzia Kieffer from Mexico (Diptera: Ceratopogonidae), Zootaxa 4294 (4), pp. 401-418 : 403

Key to adult Schizonyxhelea of Mexico

(Males of S. guyana Clastrier and females of S. zoologica n. sp. are unknown)

1 Males ...............................................................................................2

- Females.............................................................................................5

2 Gonostylus with several crenulations on mesal surface.......................................... S. zoologica n. sp.

- Gonostylus simple, without crenulations on mesal surface.....................................................3

3 Gonostylus with basal thumb-like appendage; wing membrane without macrotrichia beyond costa to wing tip................................................................................................. S. thomsenae (Wirth)

- Gonostylus without basal thumb-like appendage; wing membrane with macrotrichia beyond costa to wing tip............ 4

4 Aedeagus with distal heavily sclerotized horn-shaped sclerite.................................... S. bulla (Thomsen)

- Aedeagus without distal heavily sclerotized horn-shaped sclerite.......................... S. forattinii Wirth & Grogan

5 Wing membrane without narrow fringe of macrotrichia beyond the costa to wing tip................ S. thomsenae (Wirth)

- Wing membrane with narrow fringe of macrotrichia beyond the costa to wing tip.................................. 6

6 Wing with 2 radial cells; costa long, costal ratio 0.65; two small ovoid spermathecae................. S. bulla (Thomsen)

- Wing with 1 narrow radial cell; costa short, costal ratio 0.45–0.50; one large retort-shaped spermatheca.................7

7 Claws straight without bifid tips or hair-like basal tooth; 3rd palpal segment with only 1 capitate sensillum; costa very short, costal ratio 0.45................................................................. S. forattinii Wirth & Grogan

- Claws with bent bifid tips and hair-like basal tooth; 3rd palpal segment with 3 captitate sensilla; costa short, costal ratio 0.50....................................................................................... S. guyana Clastrier