Onychodus is really a genus of prehistoric lobe-finned fish with the Devonian period of time, somewhere around 400 million yrs ago. Noted for its distinct functions, Onychodus was an early illustration of sarcopterygian fish, which incorporates ancestors of recent lungfish and tetrapods. Nurse Sharks can be a nocturnal bottom feeder, https://socialistener.com/story4044995/what-does-flowerhorn-fish-mean