Pseudophyllid cestodes (former order pseudophyllidea) are tapeworms with multiple "segments" (proglottids) and two bothria or "sucking grooves" as adults.

The majority of genera in this group have fish as their definitive hosts, but the most important family of pseudophyllid cestodes is Diphyllobothriidae, which infect mammals, birds and reptiles as their definitive hosts and use either copepods (a group of small crustaceans found in the sea and nearly every freshwater habitat, e.g. Spirometra) or both copepods and fish as in the broadfish tapeworm as intermediate hosts.

[2] The hermaphroditic Schistocephalus solidus parasitizes fish and fish-eating water birds, with a cyclopoid copepod as the first intermediate host.

When humans harbor plerocercoids of pseudophyllidean cestodes outside the small intestine, it can cause sparaganosis.

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