title: Sarcocysts of an unidentified species of Sarcocystis in the sea otter (Enhydra lutris).
abstract: The number of Sarcocystis species that infect sea otters (Enhydra lutris) is unknown. Sea otter tissues were recently shown to harbor sarcocysts of S. neurona and of unidentified species of Sarcocystis. Whereas sarcocysts of S. neurona have walls 1-3 microm thick with type 9 villar protrusions, ultrastructure of a distinct thin-walled sarcocyst (0.5-0.7 microm thick) lacking villar protrusions, but instead exhibiting minute type 1 undulations on the sarcocyst wall, is described in this report. Parasites characterized from a sea otter infection were inferred to be related to, but distinct from, other species belonging to Sarcocystis, based on sequencing and phylogenetic analysis of a portion of the beta subunit of the plastid-encoded RNA polymerase gene.
authors.affiliation: Parasite Biology, Epidemiology and Systematics Laboratory, Animal and Natural Resources Institute, Agricultural Research Service, United States Department of Agriculture, Building 1001, Beltsville, Maryland 20705-2350, USA. jdubey@anri.barc.usda.gov
authors.forename: J P
authors.initials: JP
authors.lastname: Dubey
authors.forename: D S
authors.initials: DS
authors.lastname: Lindsay
authors.forename: B M
authors.initials: BM
authors.lastname: Rosenthal
authors.forename: N J
authors.initials: NJ
authors.lastname: Thomas
mesh_terms: D000818:Animals; D017931:DNA Primers; D016054:DNA, Protozoan / Q000737:chemistry; D012321:DNA-Directed RNA Polymerases / Q000235:genetics; D008854:Microscopy, Electron / Q000662:veterinary; D018482:Muscle, Skeletal / Q000469:parasitology* / Q000648:ultrastructure; D010041:Otters / Q000469:parasitology*; D010802:Phylogeny; D016133:Polymerase Chain Reaction / Q000662:veterinary; D012522:Sarcocystis / Q000145:classification / Q000235:genetics / Q000302:isolation & purification* / Q000648:ultrastructure; D012523:Sarcocystosis / Q000469:parasitology / Q000662:veterinary*
chemical_list: D017931:DNA Primers; D016054:DNA, Protozoan; D012321:DNA-Directed RNA Polymerases