title: The relationship of Hammondia hammondi and Sarcocystis mucosa to other heteroxenous cyst-forming coccidia as inferred by phylogenetic analysis of the 18S SSU ribosomal DNA sequence.
abstract: The complete sequence of the 18S small subunit (SSU) ribosomal DNA of Hammondia hammondi and Sarcocystis mucosa was obtained and compared to SSU rDNA sequences of Neospora caninum, Toxoplasma gondii, Besnoitia besnoiti, 2 species of Frenkelia, 3 species of Isospora, and 13 species of Sarcocystis. Analyses showed that H. hammondi and T. gondii are monophyletic and that these taxa shared a common ancestor with N. caninum and B. besnoiti. The weight of evidence shows that S. mucosa, S. neurona, and Frenkelia species form a clade thereby supporting the conclusion that Sarcocystis is paraphyletic.
authors.affiliation: Parasite Biology and Epidemiology Laboratory, USDA, BARC-EAST, Beltsville, MD 20705, USA. mjenkins@lpsi.barc.usda.gov
authors.forename: M C
authors.initials: MC
authors.lastname: Jenkins
authors.forename: J T
authors.initials: JT
authors.lastname: Ellis
authors.forename: S
authors.initials: S
authors.lastname: Liddell
authors.forename: C
authors.initials: C
authors.lastname: Ryce
authors.forename: B L
authors.initials: BL
authors.lastname: Munday
authors.forename: D A
authors.initials: DA
authors.lastname: Morrison
authors.forename: J P
authors.initials: JP
authors.lastname: Dubey
mesh_terms: D000818:Animals; D016782:Apicomplexa; D003044:Coccidia / Q000145:classification; D016054:DNA, Protozoan / Q000235:genetics*; D004275:DNA, Ribosomal / Q000235:genetics*; D021741:Eimeriida / Q000145:classification* / Q000235:genetics; D005784:Gene Amplification; D008969:Molecular Sequence Data; D010802:Phylogeny; D012337:RNA, Ribosomal, 18S / Q000235:genetics*; D012522:Sarcocystis / Q000145:classification* / Q000235:genetics; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA
chemical_list: D016054:DNA, Protozoan; D004275:DNA, Ribosomal; D012337:RNA, Ribosomal, 18S