Key to the species of Austroniphargus group

1. Accessory flagellum 1-articulate. Coxal plate 4 deeply carved distally. Pleopods with both rami equally developed........ 2

- Accessory flagellum 2-articulate. Coxal plate 4 barely carved. Pleopods with rudimentary inner rami................... 3

2. Telson with dorsal spine-setae and setae. Male uropod 3 posterior lobe distally rounded...... S. starmuehlneri Ruffo, 1960

- Telson with dorsal setae only. Male uropod 3 posterior lobe distally bifurcated......................... S. straussi sp. n.

3. Exopod of pleopods 11−15-articulate. Rami of male uropod 2 thick, without posterior spine-setae; inner ramus with 2-articu- late sculptured spine-seta......................................................... A. bryophilus Monod, 1925

- Exopod of pleopods 7−10-articulate. Rami of male uropod 2 ordinary, with posterior spine-setae; inner ramus without 2-artic- ulate sculptured spine-seta, but only with regular spine-setae.................................. A. petiti Monod, 1925