Family Anaxyelidae Martynov, 1925

Identification key for subfamilies of Anaxyelidae

1. Fore wing with pterostigma very large, reaching the midlength of cell 3r; cell 2r 4 × as long as wide and as long as cell 1r; 1-Rs, 1-M, 2-Rs and 2-M meeting at one point, so Rs+M is absent....................... Dolichostigmatinae Rasnitsyn, 1969

- Fore wing with pterostigma usually not reaching the midlength of cell 3r; cell 2r less than 3 × as long as wide and usually significantly shorter than cell 1r; Rs+M present................................................................ 2

2. Fore wing with Sc developed as a longitudinal vein................................. Kempendajinae Rasnitsyn, 1980

- Fore wing with Sc absent or present as a crossvein........................................................... 3

3. Fore wing with cell 2r short and wide (less than 1.5 × as long as wide), widened basally, or united with 1r (1r-rs completely or partly reduced); Rs+M usually longer than 2-M, sometimes bifurcating beyond 1m-cu........... Syntexinae Benson, 1935

- Fore wing with cell 2r long and narrow (more than 1.5 × as long as wide), widened apically, 1r-rs always present; Rs+M longer or shorter than 2-M, always bifurcating before 1m-cu................................... Anaxyelinae Martynov, 1925