<p>Species of <em><strong>Teuthowenia</strong></em> are moderate-sized (140-380 mm gladius length), midwater cranchiids. Each species occupies a separate region of the world's oceans where primary productivity is relatively high. Paralarvae occupy near-surface waters until they reach a relatively large size of 50-100 mm ML. </p> <div ><!-- ToL Image #START# --> <a href="javascript: w = window.open('http://tolweb.org/media/3405', '3405', 'resizable,height=600,width=800,scrollbars=yes'); w.focus();"><img src="http://tolweb.org/tree/ToLimages/TEUTHOWENIA.100a.JPG"/></a><!-- ToL Image #END# --><p> <strong>Figure</strong>. Lateral view of <em><strong>T. megalops</strong></em> in the &quot;cockatoo&quot; posture. Video still frame from a videotape recorded in-situ (Vecchione and Roper, 1991), JOHNSON SEA-LINK I submersible dive 2141; 4 August 1987; New England; depth = 789 m; temp. = 4.8&deg; C; ML = 137 mm. <a href="http://www.mnh.si.edu/cephs/vr91/cephs4.html#tmegalo1">An AVI format video clip of this animal is available at Cephalopods in Action </a></p> </div> <h4>Brief diagnosis: </h4> <p>A taoniin ...</p> <ul> <li> with three photophores on eyeball. </li> <li>with anterior third of fins attaching to mantle. </li> </ul>