Abstract
The molecular phylogeny of methanogenic archaea associated with the flagellated protist species Dinenympha and Microjoenia in the gut of termites, Reticulitermes speratus and Hodotermopsis sjoestedti, and those attached to the gut epithelium was examined based on PCR-amplified small-subunit ribosomal RNA genes. The sequences identified were classified into six groups within the genus Methanobrevibacter, including groups of yet uncharacterized novel species. Closely related methanogens were shared between Microjoenia and some Dinenympha cells in each termite. The methanogens harbored by the flagellates were phylogenetically different from the methanogens associated with the gut epithelium, suggesting that distinct methanogen species showed distinct spatial distributions in the termite gut.
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