1887

Abstract

Sequences of small-subunit rRNA genes have been obtained for four new isolates of . Phylogenetic analyses give new insights into the evolution of these organisms. A novel from pigs in Vietnam that produces uninucleate cysts proved to be unrelated to other uninucleated cyst-producing species. Revival of the name for this organism is proposed. Instead of being related to , it shares a recent common ancestor with the non-encysting in a lineage that is basal to the tetranucleate cyst-producing clade. This suggests that species producing cysts with four nuclei are descended from an ancestor that produced cysts with a single nucleus. An from a horse was isolated in culture. No cysts were observed in the original stool sample but the sequence is placed unequivocally within the clade of tetranucleate cyst-producing species with no other sequences being specifically related. Revival of the name for this organism is proposed. The sequence was found to be the most closely related to and , as predicted, despite the organism having been an environmental isolate originally assigned to . Finally, a partial gene sequence from a pig proved to be virtually identical to that of from an ostrich, suggesting that the latter name is a synonym.

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2006-09-01
2021-04-16
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