Eurypterus
... that a fossil of the extinct sea scorpion Eurypterus was once thought to be a catfish?
... that a <a href="./Fossil" id="mwASI" rel="mw:WikiLink" title="Fossil">fossil</a> of the <a class="mw-redirect" href="./Extinct" id="mwASM" rel="mw:WikiLink" title="Extinct">extinct</a> <a href="./Eurypterid" id="mwASQ" rel="mw:WikiLink" title="Eurypterid">sea scorpion</a> <i id="mwASU"><b id="mwASY"><a href="./Eurypterus" id="mwASc" rel="mw:WikiLink" title="Eurypterus">Eurypterus</a></b></i> <i id="mwASg">(restoration pictured)</i> was once thought to be a <a href="./Catfish" id="mwASk" rel="mw:WikiLink" title="Catfish">catfish</a>?