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  • Title: Eimeria trichosuri: phylogenetic position of a marsupial coccidium, based on 18S rDNA sequences.
    Author: Power ML, Richter C, Emery S, Hufschmid J, Gillings MR.
    Journal: Exp Parasitol; 2009 Jun; 122(2):165-8. PubMed ID: 19248779.
    Abstract:
    Phylogenetic analysis of the genus Eimeria suggests that parasite and host have coevolved over broad evolutionary timescales. Here we extend this analysis by determining the 18S rDNA gene sequence of the marsupial coccidium, Eimeria trichosuri, and assessing its phylogenetic position relative to Eimeria from birds, reptiles and placental mammals. This analysis placed E. trichosuri clones in a clade that diverged before the major clade comprising species from placental mammals. The position of E.trichosuri is consistent with host phylogeny where marsupials represent an ancient evolutionary line that predates the placental mammal line.
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