Orygmatobothrium persiense n. sp. (Cestoda: Phyllobothriidea) from the Arabian Smooth-Hound Shark Mustelus mosis (Triakidae) in the Persian Gulf

A new species of Orygmatobothrium Diesing, 1863 was discovered from Mustelus mosis Hemprich et Ehrenberg in the north-eastern Persian Gulf. Orygmatobothrium persiense n. sp. is the fourth valid species of its genus and differs from its congeners by the number of the proglottids. In addition, the testes distributed in 3–4 rows deep in cross sections, the length of the cephalic peduncle, and a conspicuous bothridial cleft above the apical sucker distinguish the new species, respectively, from O. juani, O. musteli, and O. schmittii. This is the first time that a species of Orygmatobothrium is described and reported outside the Atlantic Ocean.