aganthodii defined in 1951 yearaganthodii - aganthodii;
aganthodii - Group of fossil fish, the earliest known Gnathostomes, mainly Devonian, 350 to 400 million years ago, but lasted from Silurian to Permian, Bony skeleton. Spines at front margin of fins, and a row of spines between pectoral and pelvic fins. Heterocercal tail.
near aganthodii in Knolik
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