Taxonomic studies were performed on eight strains of α-haemolytic streptococci that showed very low DNA-DNA hybridization similarity values with all established members of the mitis group of the genus . These strains were isolated from the tooth surface and pharynx of humans. 16S rRNA gene sequence analysis showed that these strains belonged to the mitis group, but that they fell into two new branches. DNA-DNA hybridization demonstrated two new similarity groups. From the results of the present study, the names peroris sp. nov. and sp. nov. are proposed for these new groups. The type strains are 0–66(= GTC 848= JCM 10158) and 0–122(= GTC 849= JCM 10157), respectively.


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