Grasseella is a genus in the phylum Apicomplexa.
History This genus was created by Tuzet and Ormières in 1960.Tuzet O, Ormieres R (1960) Grasseella microcosmi n. g. n. sp. coccidie parasite de Microcosmus sulcatus Coqueb. Comptes Rendus Hebdomadaires des Séances de l'Académie des Sciences 250: 2641–2643
Taxonomy There is one species recognised in this genus.
Description This species infects an ascidian worm (Microcosmus sulcatus).
The oocysts have many sporocysts, each with 2 sporozoites.
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