Xochitónal

Xochitónal (from Nahuatl, "flower of the soul"), in Mexica mythology it was a gigantic iguana that was submerged in the black waters of the Apanuiayo, one of the places where where the dead had to pass to reach Mictlán.

Other sources state that it was a giant lizard that guarded the entrance of a ford to the realm of the dead, and is depicted as an alligator in charge primarily of watching over the passage of the dead through the river "Apanhuiayo", an immense lake of black waters that represented the seventh obstacle that the soul had to overcome on its journey to its final rest. Among the Nahua cultures, he points out that the soul ("tonalli") of those who died a natural death had to elude or defeat it in order to reach the shores of the Chiconahuapan where he would meet the lord of the dead Mictlantecuhtli and in his presence would definitely die.