There are two basic types of octopus, those with fins (cirrates) and those without (incirrates). Cirrate octopuses are primitive, generally rare, and
usually found on the seafloor at depths in excess of 300 m. Incirrate octopuses (typical octopuses) are more common, and are found from rock pools to depths of 3500 m. The cirrates are also called umbrella octopuses because they resemble an umbrella when they float around in the water. This group contains 17 known species.
The genus Grimpoteuthis is commonly known as Dumbo octopuses after the Disney elephant who could fly with his ears. The ears are actually fins that the octopus flaps to propel itself through water, with or without its arms, unlike common octopuses. The eight arms are connected to each other almost to their tips by "webbing." Dumbo octopuses have external ears, a variety of shapes, can pounce on its food or grab it from water.
Dumbo octopuses deposit their eggs on black and gorgonian corals. The eggs may take 15 months to hatch. These deep-sea octopuses eat worms and snails.
References: File # 105