Abstract
When the genus Paravahlkampfia was distinguished from the genus Vahlkampfia on the basis of significant differences in small subunit ribosomal DNA sequences, Paravahlkampfia ustiana was the only described species of this new genus. More recently, a vahlkampfiid strain has been isolated (from soil from an upland farm in Scotland) which has trophozoite and cyst morphology more similar to P. ustiana than to other non-flagellating vahlkampfiid species. Also, it clusters with P. ustiana in phylogenetic trees derived from 5.8S ribosomal DNA sequences. However, it is significantly different from P. ustiana in both phenotype and internal transcribed spacer sequence. Consequently, a new species, Paravahlkampfia lenta, is proposed.
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