Teuthowenia megalops in the "cockatoo" posture. The animal rotates (head up, horizontal, or head down) with the spindle-shaped digestive gland as the fulcrum. The digestive gland is kept vertical regardless of the orientation of the mantle and head. JOHNSON SEA-LINK (JSL) I dive 2141; 4 August 1987; New England; depth = 789 m; temp. = 4.8 oC; specimen collected (USNM 816889); DML = 137 mm.
From: Vecchione, M and C.F.E. Roper. 1992. Cephalopods observed from submersibles in the western North Atlantic. Bulletin of Marine Science, 49(1-2):433-445.
Online abstract: http://invertebrates.si.edu/cephs/vr91/cephs4.html
To see other cephalopod videos: http://collections.si.edu/search/results.htm?fq=online_media_type%3A%22Video+recordings%22&q=&fq=tax_class:%22Cephalopoda%22
Author: Smithsonian's National Museum of Natural History