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Phyllobothrium hallericola n. sp. differs from all congeners in having 9-13 testes in a single field anterior to the cirrus pouch. Its bothridial margins are crenulated, not loculated. It is the second species in the genus from the Urolophidae, differing from Phyllobothrium kingae Schmidt, 1978, which has 26-32 testes in 2 longitudinal rows. It was found in the spiral valve intestines of 2 round stingrays, Urolophus halleri, at Puerto Pefiasco, Sea of Cortez, Mexico. Among numerous species of cestodes found in a survey of 10 round stingrays, Urolophus halleri, from the Sea of Cortez, Mexico, 2 were infected with 1 and 6 specimens, respectively, of a new species of Phyllobothrium Beneden, 1849. The worms were fixed whole in the intestine with 10% formalin before their discovery. Hence, some de- gree of contraction is present in most. The fol- lowing description is based on these specimens, examined as whole mounts stained with Semi- chon's carmine. All measurements are in um un- less otherwise stated. The generic diagnosis fol |
