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An obligately anaerobic, Gram-stain-negative, rod or coccobacilli organism was isolated from a faecal sample of a healthy Japanese woman. In the 16S rRNA gene sequence analysis, strain 5BBH33 T showed the highest 16S rRNA gene sequence similarity to Dialister succinatiphilus YIT 11850 T (95.9 %), Dialister propionicifaciens ADV 1053.03 T (94.3 %), Dialister micraerophilus DSM 19965 T (93.1 %), Dialister invisus DSM 15470 T (92.5 %) and Dialister pneumosintes ATCC 33048 T (91.4 %). The hsp60 gene sequence analysis also revealed strain 5BBH33 T had relatively low hsp60 gene sequence similarities (74.4-85.3 %) to other Dialister species. Strain 5BBH33 T showed 21.8-23.9 % in silico DNA-DNA hybridization values with other Dialister species. In addition, the average nucleotide identity values between strain 5BBH33 T and other Dialister species ranged from 68.7-74.2 %, indicating that this strain should be considered as new species based on whole-genome relatedness. Strain 5BBH33 T was asaccharolytic and largely unreactive for commercial kit. However, its growth was enhanced by adding 1 % (w/v) succinate to the medium; strain 5BBH33 T was able to decarboxylate succinate to propionate. The strain 5BBH33 T genome contained the enzymes involved in succinate utilization. These results improve our understanding of succinate-utilizing bacteria. On the basis of the collected data, strain 5BBH33 T represents a novel species in the genus Dialister , for which the name Dialister hominis sp. nov. is proposed. The type strain of D. hominis is 5BBH33 T (=JCM 33369 T =DSM 109768 T ).