Onychodus can be a genus of prehistoric lobe-finned fish through the Devonian interval, close to four hundred million a long time ago. Known for its distinct characteristics, Onychodus was an early illustration of sarcopterygian fish, which includes ancestors of recent lungfish and tetrapods. Platy fish are similar to swordtails but https://bookmarkzap.com/story18497421/top-aquarium-cleaning-secrets