Video provided by the Monterey Bay Aquarium Research Institute (MBARI). May not be used without written permission from MBARI.
Footage of the Grimalditeuthis bonplandi that was observed at 1000 m depth in the Monterey Submarine Canyon, California, September 25, 2005. (1) When first encountered, the squid was maintaining its position in the water column, and gently undulating the primary fins. (2) The flapping of the club's trabecular protective membranes move the tentacle. The resemblance of this movement to small organisms may be used to lure prey. (3) A presumed response to disturbance was observed: the squid is slowly swimming backward, when the distal portion of arms I-III are rapidly retracted toward the head and curl into spirals, while the fourth arms remain straight supporting the tentacle, and the squid swims forward toward the arms, enveloping the tentacle with the arms within the brachial crown. (4) A close-up of the head, visceral mass, and tail; the eye-stripe was maintained throughout the entire observation.
See the paper by Hendrik J. T. Hoving et al, published in Proceedings of The Royal Society B (http://dx.doi.org/10.1098/rspb.2013.1463)
