Roa is a seldom seen and poorly known genus of butterflyfish. With only four taxonomically described species, the genus has just about as many undescribed ones! In other words, of all the known Roa butterflyfishes to exist, at least half are not assigned with taxonomic nomenclature! As with many [...]
Nestled within the family Chaetodontidae is a complex of butterflyfish with a particular proclivity for deep reefs in the mesophotic twilight zone. They share a pattern of alternating broad brown and white bands, and possess a distinctive ocellus on the posterior soft dorsal fin. In stark contrast [...]