Later , they found out that other creatures called Triactinomyxon dubium and T. gyrosalmowere actually stages of M. cerebralis . Later , it became apparent that organisms previously called Triactinomyxon dubium and T. gyrosalmo ( class Actinosporea ) were in fact triactinomyxon stages of M. cerebralis , whose life cycle was expanded to include the triactinomyxon stage .