neither sinking nor rising in the water column.

Older specimens have been found to have shorter bodies and longer arms than juveniles.

While juveniles tend to be translucent, one study in 1985 in Norway studied the morphology between two female H. Atlanticus specimens, with one being a dark purple and the other a pale blue/white. Video evidence from the Monterey Bay Aquarium Research Institute (MBARI) was released showing a red specimen as well, giving the species

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