A Taxonomic Study of the Aeromonas hydrophila-Aeromonas punctata Group

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Abstract
A total of 203 characters was determined for 68 strains of Aeromonas belonging to the A. hydrophila-A. punctata group. The results were subjected to computer analysis using the coefficient of Jaccard-Sneath and the strains clustered by the method of aggregation according to the variance. The 68 strains can be divided into 2 well-segregated classes on the basis of 59 variable characters, of which 7 are of diagnostic value. The 2 classes are considered as 2 separate species. The 1st one (42 strains) is assigned to the type species of the genus, A. hydrophila and it appears that the species name, A. punctata, is an illegitimate synonym for A. hydrophila. The 2nd (26 strains) constitutes a new species for which the name A. sobria sp. nov. is proposed. The type strain of this new species was deposited under the reference CIP7433 (strain 208).