Tetrahymena australis (Protozoa, Ciliophora): A Well-Known But "Non-Existing" Taxon - Consideration of Its Identification, Definition and Systematic Position.
J Eukaryot Microbiol
; 63(6): 760-770, 2016 11.
Article
en En
| MEDLINE
| ID: mdl-27115713
ABSTRACT
A cryptic species of the Tetrahymena pyriformis complex, Tetrahymena australis, has been known for a long time but never properly diagnosed based on taxonomic methods. The species name is thus invalid according to the International Code of Zoological Nomenclature. Recently, a population isolated from a freshwater lake in Wuhan, China was investigated using live observations, silver staining methods and gene sequence data. This organism can be separated from other described species of the T. pyriformis complex by its relatively small body size, the number of somatic kineties and differences in sequences of two genes, namely the small subunit ribosomal RNA (SSU rRNA) and the mitochondrial cytochrome c oxidase subunit I (cox1). We compared the SSU rRNA gene sequences of all available Tetrahymena species to reveal the nucleotide differences within this genus. The sequence of the Wuhan population is identical to two sequences of a previously isolated strain of T. australis (ATCC #30831). Phylogenetic analyses indicate that these three sequences (X56167, M98015, KT334373) cluster with Tetrahymena shanghaiensis (EF070256) in a polytomy. However, sequence divergence of the cox1 gene between the Wuhan population and another strain of T. australis (ATCC #30271) is 1.4%, suggesting that these may represent different subspecies.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Tetrahymena
Tipo de estudio:
Diagnostic_studies
Idioma:
En
Revista:
J Eukaryot Microbiol
Asunto de la revista:
MICROBIOLOGIA
/
PARASITOLOGIA
Año:
2016
Tipo del documento:
Article
País de afiliación:
China