Key to all known species of Setosabatieria

1 Tail conico-cylindrical................................................................................ 2

- Tail conical.............................................................. S. conicauda n. sp. (New Zealand)

2 Arcuate or curved spicules............................................................................. 3

- L-shaped spicules with median hollow region...................... S. australis Leduc & Gwyther 2008 (New Zealand)

3 Spicules with central cuticularised strip................................................................... 4

- Spicules without central cuticularised strip................................................................ 5

4 Leaf-like extensions of the cuticle lateral to cloaca; 11–16 precloacal supplements.... S. hilarula (De Man 1922) Platt 1985 (North Sea, English Channel, Mediterranean, Northwest Atlantic, Southeast Atlantic, Bay of Bengal)

- Leaf-like projections absent; 9 precloacal supplements.................. S. jingjingae Guo & Warwick 2001 (Bohai Sea)

5 Amphideal fovea with more than 3 turns.................................................................. 6

- Amphideal fovea with 2.5 turns; gubernaculum with triangular apophysis. S. triangularis Riera et al. 2006 (Canary Islands)

6 Amphideal fovea with 4.25 turns; 3–4 sub-cephalic setae per file............ S. fibulata (Wieser 1954) Platt 1985 (Chile)

- Amphideal fovea with 3.5 turns; 6–8 sub-cephalic setae per file......... S. coomansi Huang & Zhang 2006 (Yellow Sea)