Reference

C.A. Jerome, E.M. Simon, Denis Lynn (1996): Description of Tetrahymena empidokyrea n. sp., a new species in the Tetrahymena pyriformis sibling species complex (Ciliophora, Oligohymenophorea), and an assessment of its phylogenetic position using small-subunit rRNA sequences – Can. J. Zool. – 74: 1898 - 1906.