title: A Hammondia-like coccidian with a mink-muskrat life cycle.
abstract: A tissue cyst-forming coccidian morphologically resembling the known species Hammondia has a mink-muskrat life cycle. Cysts are found in skeletal muscle of muskrats (Ondatra zibetheca). Mink (Mustela vison) fed infected muskrat carcasses shed oocysts for 4 to 6 days after a prepatent period of 6 to 8 days. The oocysts, 99% of which are unsporulated in mink feces, measure 11.5 to 12 microns X 10 to 11 microns. Sporulated oocysts have 2 sporocysts, each with 4 sporozoites. The present work was insufficient to establish whether this Hammondia-like parasite is identical to the known Hammondia spp. or is a new parasite, although the evidence gathered supports the hypothesis that this parasite is a new member of the genus Hammondia.
mesh_terms: D000818:Animals; D003411:Arvicolinae / Q000469:parasitology*; D002415:Cats / Q000469:parasitology; D003044:Coccidia / Q000254:growth & development* / Q000648:ultrastructure; D004285:Dogs / Q000469:parasitology; D005243:Feces / Q000469:parasitology; D006790:Host-Parasite Interactions; D051379:Mice / Q000469:parasitology; D008907:Mink / Q000469:parasitology*; D009132:Muscles / Q000469:parasitology; D051381:Rats / Q000469:parasitology; D013045:Species Specificity