These mostly transparent cardinalfish are abundant, particularly around lagoon reefs where they form large schools often mixed with Pristiapogon luteus and other cardinal species. They are reported to differ from a very similar species, R. novaluna, in that they lack a dark spot on the lower fin base, a character of R. novaluna. Some of the photos below show specimens with varying degrees of a dark spot in that position, suggesting that it may just be a variable characteristic of asingle species.
Created 13 December 2017
Updated 14 December 2023