Described as fossil spore, but a possible euglenid according to Steemans & Wellman, 2018. [details]
From Steemans & Wellman, 2018: Tetraletes/Quadrisporites was for a long time considered a cryptospore by many ... [details]
Originally described as "spore-like" microfossil, cf. the "cyst-like" microfossils generally assigned to ... [details]