Abstract
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. Examination of marine and freshwater stingrays in northern South America during 1975 to 1978 revealed the presence of two species of Echinocephalus Molin, 1858. One of those species is described herein as new, and a new locality record is reported for the other. Specimens were removed from hosts, fixed in 10% formalin or in glacial acetic acid, stored in a solution of five parts glycerin and 95 parts 70% ethanol, then examined in glycerin after evaporation of the alcohol. All measurements are in micrometers unless otherwise stated, and figures were drawn with the aid of a drawing tube. Echinocephalus daileyi sp. n. (Figs. 1-12)
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