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Proposal of Quinella ovalis gen. nov., sp. nov., Based on Phylogenetic Analysis

L. R. Krumholz^1,, M. P. Bryant^1,2,*, W. J. Brulla^1,, J. L. Vicini^1,, J. H. Clark¹ and D. A. Stahl^2,3

¹Department of Animal Sciences, University of Illinois, Urbana, Illinois 61801
²Department of Microbiology, University of Illinois, Urbana, Illinois 61801
³Veterinary Pathobiology, University of Illinois, Urbana, Illinois 61801

^* Corresponding author.

ABSTRACT

Quin's oval is a relatively large bacterium often seen in the rumens of sheep fed diets containing some readily fermented carbohydrates. It has not been obtained in axenic cultures, but a number of its features have been determined by various methods, such as studying cell suspensions purified from rumen fluid by differential centrifugation. We obtained similarly purified suspensions from a sheep fed a diet containing a large amount of molasses. Nearly complete 16S rRNA sequence analysis of these cells as well as cells of Selenomonas ruminantium subsp. ruminantium GA192 (ATCC 12561; type strain) and S. ruminantium subsp. lactilytica HD₄ (ATCC 27209) was done. These sequences were compared with those of other bacteria. Evolutionary distance estimates indicated that Quin's oval was most closely related to the Selenomonas-Megasphaera-Sporomusa group in the gram-positive phylum but that it belongs in a new genus. We propose the name Quinella ovalis gen. nov., sp. nov., with its description based on previously known features.

Present address: 1320 Riverside Drive, Apartment 10, Fort Atkinson, WI 53538.

Present address: Monsanto Agricultural Co., St. Louis, MO 63198.

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