Prevotella is an extensive genus of strictly anaerobic Gram-stain negative bacteria that now includes more than seventy described species. The genus was originally defined in 1990 to include mainly oral, moderately saccharolytic, bile-sensitive, and succinate producing species of the genus Bacteroides (Accetto and Avguštin, 2021, Shah and Collins, 1990). It has become obvious in the last 15 years that one of the main reservoirs for Prevotella species may, however, be the mammalian gut, where the populations of Prevotella species are abundant and are even among the dominant bacteria; the best examples being the rumen and the human colon (Accetto and Avguštin, 2021). Thus, Prevotella species live in diverse host-associated habitats and occupy distinct nutritional niches, which can be predicted from carbohydrate active enzyme and polysaccharide utilization loci complements (Accetto and Avguštin, 2019, Accetto and Avguštin, 2015). The niches span the gradient from seemingly host mucin dependent urogenital species to rumen strains which rely entirely on plant cell wall polysaccharide. With the renewed interest into rumen and gut Prevotella; several novel species have been described from these habitats (Accetto and Avguštin, 2021). Yet in the light of advances in metagenomics that postulated the existence of dozens hitherto uncultivated rumen Prevotella species (Stewart et al., 2019), the cultivation efforts and especially species descriptions seem insufficient. For example, during the Hungate 1000 project (Seshadri et al., 2018) new rumen Prevotella strains were isolated and also gathered from several laboratories, resulting in complement of strains representing at least eight novel species (Accetto and Avguštin, 2019), yet none were formally defined. In this study we seek to amend this: we isolated strains tentatively corresponding to several new Prevotella species from the sheep rumen. One of these species, which contained the most isolated strains, appeared identical to the undescribed species represented by two Japanese sheep rumen strains of the Hungate 1000 collection, the BP1-145 and BP1-148. Based on the genomic and phenotypic characteristics obtained from these isolates, we propose Prevotella communis sp. nov, to accommodate the novel strains.