Polypterus Ansorgii

Polypterus pectoral fins have a distinctly fleshy, lobed base rather than the thin fin most ray-finned fish have, letting this bichir use them almost like stubby limbs to walk along the substrate rather than only swim over it. Combined with a real pair of lungs, it's easy to see why bichirs get brought up so often in conversations about the transition from water to land, even though they aren't a direct ancestor of anything that made that jump.

Care level: Easy · Temperament: Peaceful with larger tankmates · Max size: ~15" · Min tank: 55 gal · Diet: Carnivore, live/frozen/sinking meaty foods