1887

Abstract

The morphological, physiological, and nutritional characteristics and the deoxyribonucleic acid (DNA) base compositions of 39 strains of (including the available type strains) were determined. A uniform methodology provided a basis for comparison of the strains. The results, together with previous serological data and with previous results for two strains of indicate that the present genus should be divided into three genera, with the original name being restricted to obligately microaerophilic freshwater forms having a large cell diameter and a DNA base composition of 36 to 38 mol % guanine + cytosine (G + C). This genus would contain at present only one species, the type species, The generic name is proposed for the aerobic, freshwater forms having a DNA base composition of 49 to 65 mol % G + C. Thirteen species are included in this genus: The type species (Müller) comb. nov.; (Terasaki) comb. nov.; (Terasaki) comb. nov.; (Williams and Rittenberg) comb. nov.; (Canale-Parola et al.) comb. nov.; (Giesberger) comb. nov.; sp. nov.; (Williams and Rittenberg) comb. nov.; sp. nov.; (Leifson) comb. nov.; (Pretorium) comb. nov.; (Williams and Rittenberg) comb. nov.; and (Williams and Rittenberg) comb. nov. Strains of the latter two species, plus an additional strain (ATCC 12289), appear to be related to one another but should not be included together in a single species without additional supporting evidence (e.g., DNA homology studies). The following are proposed as type or neotype strains: ATCC 12638 (neotype); ATCC 15280 (type); ATCC 15279 (type); ATCC 19624 (type); ATCC 12639 (neotype); ATCC 27510 (type); and ATCC 11330 (type). The generic name is proposed for marine forms which do not attack carbohydrates and which possess a DNA base composition of 42 to 48 mol % G + C; five species are included. These are as follows: The type species (Williams and Rittenberg) comb. nov.; (Watanabe) comb. nov.; (Williams and Rittenberg) comb. nov.; (Watanabe) comb. nov.; and sp. nov. The following are proposed as type or neotype strains: ATCC 19192 (neotype); ATCC 19191 (neotype); and ATCC 27509 (type).

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/content/journal/ijsem/10.1099/00207713-23-4-340
1973-10-01
2019-10-15
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