| the plerocercus of ditrachybothridium macrocephalum rees, 1959 from two deep-sea elasmobranchs, with a molecular analysis of its position within the order diphyllidea and a checklist of the hosts of larval diphyllideans. | new collections were made of ditrachybothridium macrocephalum rees, 1959 from the deep-sea elasmobranchs apristurus laurussonii (saemundsson) and cf. rajella bigelowi (stehmann) in the northern atlantic ocean, allowing studies of the morphology of its plerocercus. the material has also allowed an estimate of its position within the diphyllidea inferred from molecular data for the first time. the plerocercus is withdrawn, but not invaginated, within a cyst with a thick vacuolated wall. the encyst ... | 2004 | 15542946 |