The megamouth shark (Megachasma pelagios) is one of the most mysterious and least understood of all the sharks. It was first recorded in 1976 and is so different from other shark lineages that it has been placed in its own family: Megachasmidae. Megamouth sharks can reach over 5 metres in length; the head is large with a short snout and, as the name would suggest, an extremely large mouth. The mouth contains over 50 rows of very small, hooked teeth.
The megamouth shark is another of those species that is hard to believe they are real. Since its discovery in 1976, few times has this shark been seen and it has only been recorded alive 3 times. This huge shark feeds by filtering plankton in his 1,3 meters long mouth. The megamouth shark lives usually at great depths but can also visit shallower waters. http://www.fordivers.com/en/blog/2013/05/21/10-especies-de-tiburon-de-las-que-probablemente-nunca-habias-oido-hablar/