1887

Abstract

Abstract

On the basis of recent phylogenetic studies of 47 species within the class and recent molecular and physiologic findings that distinguish a new group of non-sterol-requiring insect and plant mollicutes from species, we propose a revised taxonomy of the class Order I () is retained as described earlier (S. Razin and E. A. Freundt, p. 740–742, N. R. Krieg and J. G. Holt, ed., vol. 1, 1984), with provision for a single family () and two genera ( and ) for classification of sterol-requiring mollicutes primarily associated with vertebrates. Emended descriptions of the order and family for the above taxa are hereby included. Proposed order II ( ord. nov.) contains subtaxa for either nonhelical ( fam. nov.) or helical () mollicutes; the latter family is hereby transferred from the order The new order and family permit designation and classification of a monophyletic cluster of mollicute strains associated primarily with arthropods. It is proposed that nonhelical, sterolrequiring insect and plant mollicutes previously designated (Tully et al., 1989), (Tully et al., 1990), (Williamson et al., 1990), (Williamson et al., 1990), and (Williamson et al., 1990) be transferred to gen. nov., family fam. nov., as comb, nov., comb, nov., comb, nov, comb, nov., and comb. nov. Furthermore, the genus gen. nov. within the family fam. nov. is proposed for four non-sterol-requiring insect and plant mollicutes. This designation requires the transfer of (McCoy et al., 1984), (Tully et al., 1988), (Bonnet et al., 1991), and (Rose et al., 1990) to comb, nov., comb, nov., comb, nov., and comb, nov., respectively. Previously established orders and within the class are designated orders III and IV, respectively, in the proposed revision. Classification and characteristics of lower taxa within these two orders remain as previously given. The proposal outlined here does not consider the large cluster of nonculturable, arthropod-associated, plant-pathogenic mollicutes (“mycoplasma-like organisms”) recently shown to be more closely related to members of the order .

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1993-04-01
2024-06-25
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