See text Rubicundus is a genus of hagfishes, the only extant member of the subfamily Rubicundinae.

R. eos, R. lakeside, and R. rubicundus are known from single specimens caught in the Tasman Sea, Galápagos, and Taiwan, respectively.

[2] They represent the sister lineage to all other extant lineages of hagfishes, and may represent the sister group to the Cretaceous fossil hagfish Tethymyxine, from which they potentially diverged during the Late Jurassic or Early Cretaceous.

Both Rubicundus and Tethymyxine share an elongate snout, indented barbels, and numerous slime glands.

[4] Four recognized species are placed in this genus:[5][6] This jawless fish-related article is a stub.