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(invertebrate zoology)
The solid parasitic larva of certain eucestodes, such as pseudophyllideans, that develops in the body of the intermediate host.



one of the larval stages of certain tapeworms (including the broad fish tapeworm). A procercoid is approximately 0.05 mm long and is spindle-shaped. The posterior end is distinct from the rest of the body and is equipped with three pairs of chitinoid hooklets. The procercoid stage is usually passed in the body cavity of copepods, which serve as the first intermediate hosts of many tapeworms. After the second intermediate host—a fish—swallows the parasitized copepod, the procercoid is converted in the fish’s body into the next larval stage—the plerocercoid.

References in periodicals archive ?
Procercoid The first larval stage of pseudophyllidian tapeworms which develops from the onchosphere.
4 and 5): 1) copepods were infected by ingestion of eggs deposited in the bottom debris producing procercoid larvae (first larval stage) in the hemocoel of these hosts and 2) tadpoles ingested these infected copepods and plerocercoid larvae (second larval stage) developed in the body cavity and associated tissues of these hosts.
Native and introduced fish ingest copepods containing procercoid larvae that develop into plerocercoids (16).