Rajiformes
... that the order Rajiformes contains thirteen families including the guitarfish and skates?
... that the <a href="./Order_(biology)" id="mwCgo" rel="mw:WikiLink" title="Order (biology)">order</a> <b id="mwCgs"><a href="./Rajiformes" id="mwCgw" rel="mw:WikiLink" title="Rajiformes">Rajiformes</a></b> contains thirteen <a href="./Family_(biology)" id="mwCg0" rel="mw:WikiLink" title="Family (biology)">families</a> including the <a class="mw-redirect" href="./Rhinobatidae" id="mwCg4" rel="mw:WikiLink" title="Rhinobatidae">guitarfish</a> and <a class="mw-redirect" href="./Rajidae" id="mwCg8" rel="mw:WikiLink" title="Rajidae">skates</a>?