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Division of the Genus Observation of Discontinuities in Amino Acid Identity Values, a Possible Consequence of Major Extinction Events, Guides Transfer of Nine Species to the Genus , Eleven Species to the Genus , and Three Species to the Genus Gen....

Abstract

The genus in the family is known to be polyphyletic. Amino acid identity (AAI) values were calculated from whole-genome sequences of species of the genus and their distribution was found to be multi-modal. These naturally-occurring non-continuities were leveraged to standardise genus assignment of these species. We speculate that this multi-modal distribution is a consequence of loss of biodiversity during major extinction events, leading to the concept that a bacterial genus corresponds to a set of species that diversified since the Permian extinction. Transfer of nine species (, , and ) to the genus and eleven (, , , , , , , , and ) to the genus is proposed. Two novel species are described: sp. nov. and sp. nov. Evidence is presented to support the assignment of to a genus apart from to which comb nov. also belongs. The novel genus is proposed, to contain the type species comb. nov., along with comb. nov., and comb. nov.

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