tunicate
... that although a tunicate is an invertebrate, its larva may have a notochord and resemble a small tadpole?
... that although a <b id="mwBck"><a href="./Tunicate" id="mwBco" rel="mw:WikiLink" title="Tunicate">tunicate</a></b> is an <a href="./Invertebrate" id="mwBcs" rel="mw:WikiLink" title="Invertebrate">invertebrate</a>, its <a href="./Larva" id="mwBcw" rel="mw:WikiLink" title="Larva">larva</a> <i id="mwBc0">(pictured)</i> may have a <a href="./Notochord" id="mwBc4" rel="mw:WikiLink" title="Notochord">notochord</a> and resemble a small <a href="./Tadpole" id="mwBc8" rel="mw:WikiLink" title="Tadpole">tadpole</a>?