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Echinocephalus daileyi sp. n. is described from the freshwater stingrays Potamotrygon circularis and P. hystrix in South America. It is most similar to E. diazi by virtue of possessing a gubernaculum and six postanal papillae, but may be distinguished from E. diazi and other members of the genus by possessing 30 to 34 rows of spines on the cephalic bulb, three preanal papillae, and a body 55 to 85 mm long. Specimens of E. diazi were collected from Himantura schmardae, the type host, from Cienaga Grande, Colombia, a new locality record. Based on numerical phylogenetic analysis, E. daileyi is a member of a monophyletic group including E. sinensis, E. diazi, and E. pseudouncinatus.
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Deardorff et al. (1981) studied this question.
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