Santanichthys
... that the extinct fish Santanichthys is the oldest known member of Order Characiformes, which includes the tetras and the piranha?
... that the extinct fish <i id="mwCKw"><b id="mwCK0"><a href="./Santanichthys" id="mwCK4" rel="mw:WikiLink" title="Santanichthys">Santanichthys</a></b></i> is the oldest known member of Order <a href="./Characiformes" id="mwCK8" rel="mw:WikiLink" title="Characiformes">Characiformes</a>, which includes the <a href="./Tetra" id="mwCLA" rel="mw:WikiLink" title="Tetra">tetras</a> and the <a href="./Piranha" id="mwCLE" rel="mw:WikiLink" title="Piranha">piranha</a>?