Cerebratulus marginatus
... that the ribbon worm Cerebratulus marginatus can swim well by undulating its body?
... that the ribbon worm <i id="mwBHI"><b id="mwBHM"><a href="./Cerebratulus_marginatus" id="mwBHQ" rel="mw:WikiLink" title="Cerebratulus marginatus">Cerebratulus marginatus</a></b></i> can swim well by undulating its body?