Tape worm treatment in cats12/25/2023 ![]() ![]() does not have hooks or suckers like those found in Cyclophyllidean tapeworms. The scolex of adult Diphyllobothrium spp. are found in the small intestine of dogs, cats, and other fish-eating mammals including people. This plerocercoid stage is infective to larger fish paratenic hosts and to any definitive hosts that eat raw fish.Īdult Diphyllobothrium spp. The ciliated first stage larva, termed a coracidium, emerges from the egg in the presence of water and is ingested by a copepod first intermediate host where it develops into a procercoid.Ī second intermediate host ingests the copepod and a plerocercoid develops. shows the characteristic operculum (arrow). dendriticum can be more than 2 m in length latum in the small intestine of the definitive host can grow to a length of 3 to 25 m in length, while D. dend riticum include salmonids, three-spine sticklebacks, and osmerids. latum include perch, pike, burbot, sauger, and walleye Dogs and cats are infected when they ingest the plerocercoid in the fish intermediate or paratenic host.Other fish species can serve as transport (paratenic) hosts and also may be important in the life cycle of Diphyllobothrium spp.When the copepod is consumed by a second intermediate host, any of a number of species of fish, the next larval form develops (plerocercoid).In the copepod the first larval stage (procercoid) develops in 2-3 weeks. ![]() When the egg contacts water, a ciliated embryo (coracidium) hatches and is ingested by the first intermediate host, a copepod. Adult tapeworms release operculate eggs from a midventral genital pore these eggs are then passed in the feces.have indirect life cycles that require two intermediate hosts before becoming infectious to the definitive host. ![]()
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