| variation in the small subunit ribosomal dna confirms that udonella (monogenea: udonellidae) is a species-rich group. | numerous global reports of the species udonella caligorum, currently thought to be a species complex, suggests that the group may be species-rich. herein we describe udonella fugu n. sp., previously described as u. caligorum, found on the parasitic copepod pseudocaligus fugu infecting takifugu spp. from japan. using morphological data u. fugu can be distinguished from the current valid species by at least one of the traditionally used characters in udonellid taxonomy, and phylogenetic analyses o ... | 2010 | 19715695 |