Brooks, D. R.; Mayes, M. A.; Thorson, T. B. (1981). Cestode parasites in Myliobatis goodei Garman (Myliobatiformes: Myliobatidae) from Rio de la Plata, Uruguay, with a summary of cestodes collected from South American elasmobranchs during 1975-1979. Proceedings of the Biological Society of Washington. 93(4): 1239-1252.

225578

Brooks, D. R.; Mayes, M. A.; Thorson, T. B.

1981

93(4): 1239-1252

Publication

Specimens of 7 cestode species, 4 described as new, were collected from spiral valves of 4 Myliobatis goodei captured in the La Plata estuary near Montevideo, Uruguay. Discobothrium arrhynchum sp. n. differs from all other members of the genus by lacking a myzorhynchus. It most closely resembles D. myliobatidis by having relatively large suckers, markedly craspedote immature proglottids, an average of 21 testes per proglottid, and a vagina extending laterally rather than medially to the testes. Caulobothrium is recognized as a valid genus but Rhabdotobothrium is considered a junior synonym. Two species-groups within Caulobothrium are recognized, and a new species in each one is described. Caulobothrium uruguayense sp. n. most clearly resembles C. tetrascaphium by having more than 100 proglottids per strobila, craspedote proglottids, preovarian testes, more than 100 testes per proglottid, a very long cephalic peduncle, and genital pores in the anterior of the proglottid. It differs by having 14 or 15 rather than 25 bothridial loculi and recurved rather than straight cirrus sacs. Caulobothrium ostrowskiae sp. n. most closely resembles C. myliobatidis, C. opisthorchis and C. multorchidum by exhibiting postovarian testes. The new species differs from C. opisthorchis by having fewer testes and by lacking vitelline follicles encircling the postovarian testes; it differs from C. multorchidum by having elongate rather than broad flaplike bothridia; and it differs from C. myliobatidis by having fewer bothridial loculi. Rhabdotobothrium dollfusi and R. anterophallum become Caulobothrium dollfusi and C. anterophallum. Phyllobothrium myliobatidis sp. n. differs from P. auricula, which it most closely resembles, by having longer and thinner bothridial pedicels and much smaller cirrus sacs. Contracted specimens of Phyllobothrium sp. and immature specimens of 2 species of Acanthobothrium are briefly described and discussed. A table listing hosts examined and one listing cestodes collected during study of South American elasmobranch parasites from 1975-1979 are included.

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