Cestode larvae were collected from 10 species of sciaenid fishes from the coast of Rio Grande do Sul, Brazil. Eleven species of Trypanorhyncha and two unindentified larvae are reported: Pterobothrium heteracanthum, P. crassicolle, Callitetrarhynchus gracilis, C. speciosus, Dasyrhynchus pacificus, Heteronybelinia nipponica, H. annakohnae n. sp., H. estigmena, Nybelinia bisulcata, Progrillotia dollfusi, Dollfusiella sp., an unidentified species of plerocercoid larva, and an unidentified species of procercoid larva. Heteronybelinia annakohnae n. sp. is described based on specimens from four host species. It is characterized by a long pars postbulbosa and by bothridial margins covered with spines and that overlap the bulbs. Progrillotia dollfusi is redescribed based on paratypes and specimens collected in the present study. The basal tentacular armature, the presence of a prebulbar organ and of a pars postbulbosa, the attachment of the retractor muscle of the tentacle in the first third of the bulb, and the presence of gland cells in the interior of the bulbs, are reported in this species for the first time. These characteristics support and amend the diagnosis of Progrillotia. A procercoid larva is described for the first time from fish in Brazil. Measurements, descriptions, and drawings of the specimens of those species which are insufficiently or incompletely known are presented.
Platyhelminthes, Cestoda, Trypanorhyncha, Heteronybelinia, Nybelinia, Progrillotia, larval tapeworms, Sciaenidae, coast of Brazil.