On the first swimming leg of Rhizothrix sejongi Nam & Lee, 2005 (Copepoda: Harpacticoida: Rhizothricidae), with an amended key to species of the genus Rhizothrix

Rhizothrix sejongi Nam & Lee, 2005 was originally described from a sandy beach at Sangju, south coast of Korea. Upon reexamination of the paratypes of the species, an error in the description of the first swimming leg was discovered. We redescribe this leg, which is clearly armed with an inner spiniform seta and amend the key to species of the genus Rhizothrix.