Specimens of elasmobranch fishes, captured in the states of Paraná and Santa Catarina, of the southern coast off Brazil, represented by three families, four genera, and four species, were parasitized with otobothrioid trypanorhynch cestodes:
Heptranchias perlo
(Bonnaterre, 1788),
Squalus
sp. and
Carcharhinus signatus
(Poey, 1868) were parasitized with
Progrillotia dollfusi
Carvajal & Rego,1987;
Prionace glauca
(Linnaeus, 1758) with
Molicola horridus
(Goodsir, 1841) Dollfus, 1942. Details of internal morphology and/or scolex and/or proglottids surface ultrastructure, that expanded the description of
M. horridus, through observations with lightfield, and/or scanning eletronic microscopy, are provided. The known geographical distribution for the species
M. horridus is enlarged.
P. dollfusi is reported for the first time in elasmobranchs.
