narrowmouthed catsharks
... that narrowmouthed catsharks are unusual in displaying heterodont dentition, with males and females having differently shaped mouths and teeth?
... that <b id="mwA20"><a href="./Narrowmouthed_catshark" id="mwA24" rel="mw:WikiLink" title="Narrowmouthed catshark">narrowmouthed catsharks</a></b> are unusual in displaying <a href="./Heterodont" id="mwA28" rel="mw:WikiLink" title="Heterodont">heterodont dentition</a>, with males and females having differently shaped mouths and teeth?