Oceosauroida
Oceosauroida was a genus of aquatic lifeforms native to the planet Denkir IV. They were distinguished by their six paddle-like limbs 

The names of species and sub-species and illustrations of them were  seen on the chart "Evolution of Intelligent Life on Planet Denkir IV". ()

List of species and sub-species 
 Oceosauroida mendo
 Oceosauroida mendo shinobu
 Oceosauroida mendo shutaro

See also 
 Loch Ness monster (similar)
Animals