Cuyopsis symmetricus
... that the extinct Argentinian bivalve Cuyopsis symmetricus was named for the symmetry of its rectangular shells?
... that the <a class="mw-redirect" href="./Extinct" id="mwBIU" rel="mw:WikiLink" title="Extinct">extinct</a> Argentinian bivalve <i id="mwBIY"><b id="mwBIc"><a href="./Cuyopsis" id="mwBIg" rel="mw:WikiLink" title="Cuyopsis">Cuyopsis symmetricus</a></b></i> was named for the symmetry of its rectangular shells?