Dichotomous Key/Tremoctopididae

1

 * Tissue form
 * Gelatinous - Tremoctopus gelatus
 * Muscular - 2

2

 * Number of distal hectocotylus suckers
 * 27-28 - Tremoctopus robsoni
 * 15-22 - 3

3

 * Habitat
 * Atlantic Ocean - Tremoctopus violaceus
 * Pacific Ocean - Tremoctopus gracilis