Big foot, dawg. Gigantopithecus. New and "dead" species, if that ever happens really, are found all the time. Homo sapiens have survived the previous catastrophe, why wouldn't other hominids?
The thread asks what non-god beings i believe in, not what myth or fantasy i believe in.
I know human beings exist, so do an estimated 8.5 other species thay i also believe in, but as far as i know, non of those you listed