A Siphonoecetes

1. Rostrum short, not reaching beyond eye lobes........................................ S. sabatieri Rouville, 1894 *

- Rostrum long, pointed, reaching well beyond eyelobes....................................................... 2

2. Gnathopod 1 propodus posterior margin with up to 6 robust setae; uropod 1 inner ramus with several medial robust setae...................................................................................... S. typicus Krøyer, 1845

- Gnathopod 1 propodus posterior margin with 2– 3 robust setae; uropod 1 inner ramus without robust setae except terminal one in hollow..................................................................... S. smithianus Rathbun, 1905 * S. sabatieri shares the setose uropod 3 peduncle with Centraloecetes, but lacks the defining male uropod 1 peduncle bulb.