This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Cipactli (Aztec)
Cipactli was the first day of the Aztec divinatory count of 13 X 20 days (the tonalpohualli) and Cipactonal "Sign of Cipactli" was considered to have been the first diviner. According to one Aztec tradition, Teocipactli "Divine Crocodile" was the name of a survivor of the flood who rescued himself in a canoe and again repopulated the earth. In the Mixtec Vienna Codex Crocodile is a day associated with dynastic beginnings.
In Aztec mythology, Cipactli was a primeval sea monster, part crocodilian, part fish, and part toad or frog, with indefinite gender. Always hungry, every joint on its body was adorned with an extra mouth. The deity Tezcatlipoca sacrificed a foot when he used it as bait to draw the monster nearer. He and Quetzalcoatl created the earth from its body.