Two New Species Of Paraorygmatobothrium (Tetraphyllidea : Phyllobothriidae) From The Lemon Sharks Negaprion Brevirostris And Negaprion Acutidens (Carcharhiniformes : Carcharhinidae)

Two new tetraphyllidean species, Paraorygmatobothrium roberti n. sp. and Paraorygmatobothrium arnoldi n. sp., are described from the Lemon shark, Negaprion brevirostris, and the Sicklefin lemon shark, Negaprion acutidens, respectively. The 2 species are consistent in morphology with the 5 existing species of Paraorygmatobothrium. Paraorygmatobothrium roberti n. sp. differs from existing species of Paraorygmatobothrium in features such as total length, bothridial length, apical sucker diameter, testes number, dimensions of the cirrus sac, and dimensions of the ovary. Paraorygmatobothrium arnoldi n. sp. differs from existing species of Paraorygmatobothrium in total length, proglottid width, number of proglottids per strobila, bothridial length and width, apical sucker diameter, testis number, and dimensions of the cirrus sac. The 2 new species differ from one another in total length, maximum width, and ovary length. Description of these 2 new species brings to 7 the known number of species of Paraorygmatobothrium.