porcupine ray
... that although classified as a stingray, the porcupine ray does not have a stinging spine on its tail?
... that although classified as a <a href="./Stingray" id="mwErg" rel="mw:WikiLink" title="Stingray">stingray</a>, the <b id="mwErk"><a href="./Porcupine_ray" id="mwEro" rel="mw:WikiLink" title="Porcupine ray">porcupine ray</a></b> <i id="mwErs">(pictured)</i> does not have a stinging spine on its tail?