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Subadults and adults of Octopoteuthis lack tentacles. All the arms terminate in photophores and these photophores lack muscular lids. Instead, they possess mobile chromatophores that conceal the photogenetic tissue. Arm tips of Octopoteuthis are frequently broken off during capture. This "fragility" is probably a normal defensive weapon (see Behavior of O. neilseni).
The species in this genus are poorly defined and identification, therefore, may be difficult.
An octopoteuthid ...
- with small, dark photophores at tips of all arms.