title: Sporulation of Marteilioides branchialis n. sp. (Paramyxea) in the Sydney rock oyster, Saccostrea commercialis: an electron microscope study.
abstract: The ultrastructure of sporulation of a new parasite, Marteilioides branchialis (Paramyxea), in the Sydney Rock oyster, Saccostrea commercialis, is described. The development is typical of other Paramyxea whereby a stem cell internally cleaves a secondary cell contained within a vacuole. It differs from other species in the phylum in that each secondary cell produces a single spore composed of two concentric cells, one within a vacuole of the other. This type of sporulation represents the simplest of all known Paramyxea. Infection results in focal gill lesions and was observed concurrently with an epizootic of another paramyxean, Marteilia sydneyi.
authors.affiliation: Department of Parasitology, University of Queensland, Brisbane, Australia.
authors.forename: T J
authors.initials: TJ
authors.lastname: Anderson
authors.forename: R J
authors.initials: RJ
authors.lastname: Lester
mesh_terms: D000818:Animals; D056890:Eukaryota / Q000145:classification / Q000502:physiology / Q000648:ultrastructure*; D010125:Ostreidae / Q000469:parasitology*