The closest relatives to the strain are Coprococcus eutactus (94.23%), the type species of the genus Coprococcus, and Eubacterium ruminantium (94.11%) based on the 16S rRNA gene sequence similarity. None of the closely related species identified had an ANI value above 95% (C. eutactus, 80.9%; E. ruminantium, 77.6%). GTDB-Tk assigned the species to genus ‘CAG-127’ within the family Lachnospiraceae. The closest relative based on the genome tree is E. ruminantium (followed by C. eutactus). However, the POCP value was 51.4% to C. eutactus, while it was 21.7% to Eubacterium limosum, the type species of the genus Eubacterium. Therefore, the isolate was considered to represent a novel species within the genus Coprococcus. The isolate was found to be the same species as ‘Wujia chipingensis’ (Liu et al., 2021), with ANI and GGDC values of 98.3% and 84.40%, respectively. However, this species has not yet been validated. Cells are short rods (0.7-1.0 µm in length) (Supplementary Files) that grow well on modified Gifu Anaerobic Medium with 5% Sheep blood under anaerobic conditions. Genome analysis predicted the ability to utilise starch, and produce acetate, propionate, L-glutamate, cobalamin (vitamin B12), and folate. Antibiotic resistance may be present due to the detection of vanU (ARO:3000575) and tetracycline-resistance ribosomal protection protein (ARO:0000002). The G+C content is 44.2 mol%, which varies by more than 1% to that of C. eutactus (43.1 mol%). The type strain, CLA-AA-H212T (=DSM 112732T), was most prevalent in wastewater (37.3% of 1,000 samples positive), followed by pig gut microbiota (33.8%), and human gut microbiota (23.9%). The bacterium was isolated from the faeces of a healthy 26-year-old woman.