Abstract
Cryptocaryon irritans, a ciliated protozoan, is one of the most devastating parasites of marine fish cultured in temperate and tropical seas. Based on the remarkable affinities with its “freshwater counterpart” Ichthyophthirius multifiliis, C. irritans has traditionally been included in the Ichthyophthiriidae, although cytological studies failed to show ultrastructural features to warrant its inclusion in this family. We sequenced the complete 18S rRNA gene (1,765 nucleotides) from aC. irritansisolate from the Red Sea. Our phylogenetic analyses unequivocally show that C. irritans is taxonomically distinct from I. multifiliis (15.4% divergence) and justify C. irritans' inclusion into the order Prorodontida within the Class Prostomatea. Cryptocaryonidae is proposed as a new family name.
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