The remotely operated vehicle Deep Discoverer imaged this bobtail swimming during the Windows to the Deep 2018 expedition. Because of their rounded bodies, this species of cephalopods in the order Sepiolida are generally known as "bobtail squids." Although called squids, bobtails have long been considered to be modified cuttlefishes that have lost the internal shell (cuttlebone). However, recent evidence from DNA sequencing indicates that they are not closely related to either squids or cuttlefishes, although they are in the broad group of 10-armed cephalopods.

From: Bobtails: Not Your Average Dumpling.