title: Validation of Polytomella piriformis nomen nudum (Chlamydomonadaceae): a Distinct Lineage Within a Genus of Nonphotosynthetic Green Algae.
abstract: Polytomella strain SAG 63-10 was first described by Pringsheim (1963) as Polytomella piriformis nomen nudum. The current study validates the name Polytomella piriformis following the International Code of Nomenclature for algae, fungi, and plants (ICN). We present 18S rRNA sequences of SAG 63-10 and several other Polytomella strains, which, along with existing mitochondrial DNA sequences, clearly distinguishes P. piriformis n. sp. from other available Polytomella species. The first type material of the species is presented, as well as an illustration and micrographs. Our own observations of P. piriformis SAG 63-10 are compared to Pringsheim's description and to descriptions of other valid Polytomella spp.
authors.affiliation: Department of Biology, Dalhousie University, 1355 Oxford St., Halifax, Nova Scotia, B3H 4R2, Canada.
authors.forename: Shelley M
authors.initials: SM
authors.lastname: MacDonald
authors.affiliation: Department of Biology, Dalhousie University, 1355 Oxford St., Halifax, Nova Scotia, B3H 4R2, Canada.
authors.forename: Robert W
authors.initials: RW
authors.lastname: Lee
mesh_terms: D001483:Base Sequence; D004272:DNA, Mitochondrial; D018744:DNA, Plant / Q000235:genetics; D019143:Evolution, Molecular; D017343:Genes, Plant; D054629:Genome, Mitochondrial; D008928:Mitochondria / Q000235:genetics; D008969:Molecular Sequence Data; D010802:Phylogeny; D012337:RNA, Ribosomal, 18S; D017422:Sequence Analysis, DNA; D013045:Species Specificity; D016823:Volvocida / Q000145:classification* / Q000235:genetics*
chemical_list: D004272:DNA, Mitochondrial; D018744:DNA, Plant; D012337:RNA, Ribosomal, 18S
keywords: 18S rRNA; flagellate; microscopy; phylogeny; species