Sparnodus mcracanthus, fish, sea beam Baryonyx whorl-tooth shark---permian-

whorl-tooth shark---permian-

with a single dorsal fin

which had columns of replacement teeth

Eryon actiformis is a crab-like lobster creature classified as a lobster and is one of the world's oldest true lobsters

Their wings were formed by a membrane of skin

Sparnodus mcracanthus, fish, sea beam Baryonyx whorl-tooth shark---permian-Sparnodus is an extinct genus of prehistoric perciform fish in the family Sparidae. Species of this genus were nektonic carnivore. These fishes lived in the Cenozoic Era, in Oligocene and Paleocene 55. 8 to 23. 03 million years ago. These medium sized fishes usually could reach a length of 30 centimeters (12 in). They had a laterally compressed body, quite gibbous in the forepart, with a single dorsal fin, well developed and supported by strong