Abstract
The taxonomic relationship among strains of Alcaligenes eutrophus (H16, H20, TF93), strains tentatively placed in A. eutrophus (CH34, JMP134), Alcaligenes hydrogenophilus inv. nom . (M50), “Pseudomonas oxalaticus” inv. nom . (OX1), and non H 2 -lithotrophic, oxalate-utilizing new strains was established by numerical classification, DNA base composition and DNA-DNA hybridization studies. Strains CH34 and JMP134 show 25% of DNA homology with A. eutrophus H16 and a phenotypic similarity of more than 80% (S J ). “P. oxalaticus” OX1 shares 50% of DNA-DNA homology with A. eutrophus H20 and a phenotypic similarity of more than 90%. The non H- 2 -lithotrophic strains are wide-spread within the range of species variation of A. eutrophus , thus indicating that H 2 -lithotrophy cannot longer be considered as a predominant phenotypic criterium for A. eutrophus . Moreover, five strains have a subpolar flagellum (the others are peritrichous), suggesting that different flagellation types could exist in the same species. The presence of a cryptic megaplasmid was detected in strains TA07 and TA19.
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