Taxonomic resolution of Phyllobothrium van Beneden (Cestoda: Tetraphyllidea) and a description of a new species from the leopard shark Triakis semifasciata
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- Ruhnke, T.R. Syst Parasitol (1996) 33: 1. doi:10.1007/BF00009715
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Phyllobothrium riseri n. sp. is described from the leopard shark Triakis semifasciata collected from Californian coastal waters. The descriptions of the type-species, Phyllobothrium lactuca, and P. serratum are amended. P. serratum differs from P. lactuca in having wider mature segments, a larger apical sucker and a greater number of testes in cross-section. P. riseri differs from P. lactuca in being shorter, having a narrower cirrus-sac and having a smaller ovicapt. It differs from P. serratum in being shorter, having a narrower maximum width and having a narrower cirrus-sac. The generic diagnosis of Phyllobothrium is amended in order to be consistent with the descriptions of these three species, and the genus is considered to be monophyletic. Species in Phyllobothrium appear to be restricted to shark species belonging to the family Triakidae.