<p><em><strong>O. ingens</strong></em> reaches a length of at least 500 mm ML (Kubodera, <em>et al</em>., 1998) and is found in circumpolar but sub-Antarctic waters.</p> <h4>Diagnosis</h4> <p>An Onykia ...</p> <ul> <li>with rhomboidal fins (ie fins not drawn-out posteriorly).</li> <li>with warts on the skin.</li> <li>with rostrum of gladius having a triangular cross-section.<br /> </li> </ul>