Spangled Darter

Etheostoma obama, the spangled darter, is a species of freshwater ray-finned fish, a darter from the subfamily Etheostomatinae, part of the family Percidae, which also contains the perches, ruffes and pikeperches. It is endemic to the eastern United States where it is only known to occur in the Duck River and the Buffalo River, both in Tennessee. Discovery and naming Steven Layman of Geosyntec Consultants and Rick Mayden of Saint Louis University studied the freshwater darters, most of which are native to Alabama and Tennessee in the United States.

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Obamadon es un género extinto de lagarto poliglifanodonte del Cretácico Superior de América del Norte. Sus fósiles se han hallado en la Formación Hell Creek de Montana y la Formación Lance de Wyoming. Los investigadores describen que se distingue por sus "dientes altos y delgados con grandes cúspides centrales separadas de las pequeñas cúspides accesorias por surcos linguales."