ˌärkəˈjēd.ēz, ärˈkijəˌtēz noun
Usage: capitalized
Etymology: New Latin
: a genus of pseudophyllidean tapeworms living as neotenic larvae in the coelom of aquatic oligochaete worms, some being reported to develop into typical caryophyllid worms when the host is ingested by a suitable fish — compare caryophyllaeidae