Three forms of tetraphyllidean cercoids occurring in the alimentary tract of bony fishes are described. Cercoids with bilocular bothridia (probably Pseudanthobothrium sp.) and with trilocular bothridia (probably Oncobothrium sp.) are similar to those occurring at the South Shetland Islands. Cercoids with subcylindrical bothridia (possibly Marsupiobothrium sp.) are for the first time described from the Antarctic. Results indicated the presence of representatives of not less than three tetraphyllidean genera in elasmobranchs (probably skates) occurring in the Ross Sea.
Instituto Centrale per la Ricerca Scientifica e Tecnologica Applicata alla Pesca Marittima, Via L. Respighi, 5, 00197 Roma, Italy
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