I’ve seen both Phacops and Eldredgeops used interchangeably. For example: https://en.wikipedia.org/wiki/Phacops_rana

Technically speaking, Eldredgeops is the genus and Phacops is the species. ‘Eldredgeops’ gets its name from paleontologist Niles Eldredge from the American Museum of Natural History in New York. ‘Phacops rana’ translates roughly to…[Read more]