Siphonoecetina

1. With ordinary, strong to weak rostrum (Fig. 4 A–B).......................................................... 2

- Without rostrum; pseudorostrum projecting from frons (Fig. 4 C)............................................... 4

2. Distal margin of peduncle of uropod 3 with few simple setae (Fig. 4 G 2). Male peduncle of uropod 1 with ordinary convex corona (Fig. 3 E 1)............................................................. Siphonoecetes Krøyer, 1845 A

- Distal margin of peduncle of uropod 3 with row of long, pectinate setae (Fig. 4 G 1) Male with bulbous ventroapical projection on peduncle of uropod 1 (Fig. 3 F 2)................................................. Centraloecetes Just, 1983 B

4. Antenna 2 peduncle articles 4 and 5 with many long, plumose, natatory setae ventrally; abodes made of light plant material........................................................................ Australoecetes sellicki (Sheard, 1936)

- Antenna 2 peduncle articles 4 and 5 with normal siphonoecetid simple setae; abodes of empty micromolluscs, polychaete tubes and similar items furnished with sand and shell tube................................... Stebbingoecetes Just,1985 C