Progrillotia pastinacae Dollfus, 1946 (Cestoda: Trypanorhyncha) is redescribed from the spiral valve of Dasyatis pastinaca (Linnaeus)(Dasyatididae) from the coast of France. Progrillotia dasyatidis sp. n. is described from the spiral valves of Dasyatis tortonesei Capapé (Dasyatididae) from the Mediterranean in the Gulf of Gabès (Tunisia) and D. pastinaca from the Bassin d’Arcachon (France). The new species differs from congeners in having, on the tentacles, a single rather than two rows of intercalary hooks and fewer testes. The generic definition is emended based upon the new species, the redescription of P. pastinacae Dollfus, 1946 and re-examination of the type specimen of P. louiseuzeti Dollfus, 1969. Important additional characters noted are that the tentacular hooks are solid, a prebulbar organ is present and that there are gland cells attached to the retractor muscle within the bulb. A cladistic analysis suggests that the genus is closely allied with the Eutetrarhynchidae. Progrillotia dollfusi Carvajal et Rego, 1983 is provisionally excluded from the genus as the adult of the species is unknown and a key character of the genus is that the testes are pre-ovarian.

The trypanorhynchan cestode subgenus Progrillotia was erected by Dollfus (1946) within the genus Grillotia Guiart, 1927 to accommodate a species of cestode from the spiral valve of the stingray Dasyatis pastinaca (Linnaeus, 1758) collected at Concarneau on the Atlantic coast of France. The type species, Grillotia (P.) pastinacae, possessed two bothridia and an atypical heteroacanthous armature, but differed from species of Grillotia in the anatomy of the adult with the testes lying exclusively anterior to the ovary, hence the name Progrillotia. Subsequently, Dollfus (1969) added a second species, P. louiseuzeti, collected from Dasyatis violacea (Bonaparte, 1832), from Sète, on the Mediterranean coast of France. Dollfus (1969) elevated Progrillotia to generic rank, noting that in addition to the disposition of the testes anterior to the ovary, the two species of Progrillotia possessed an armature that differed from Grillotia in lacking a continuous band of small hooks on the external surface of the tentacle. Both species of Progrillotia were incompletely described and the critical details of the distribution of hooks on the external surface of the metabasal region of the tentacle were not described. In addition, the features of the terminal genitalia were not described. More recently, Carvajal and Rego (1983) described