The sarcocysts had a distinct wall, which was radically striated by palisading villar protrusions.
Tohru Kimura 2011, 'Eosinophilic myositis resulted from Sarcocystis infection in prime marbled beef ofJapanese black cattle', Veterinary Worldhttp://www.scopemed.org/mnstemps/2/2-1316680490.pdf. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
The primary wall evolved from a continuous thin layer into folds and later, into villar protrusions.
Paperna I. 2002, 'Ultrastructural study of the development of Sarcocystis singaporensis sarcocysts inthe muscles of its rat host', Parasitehttp://dx.doi.org/10.1051/parasite/2002092161. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)