rhabdocoelidan

Example:Historically, the term polycelidan was used to describe some species bearing similarities to rhabdocoelidans.

Definition:A term in some older classifications for worms resembling rhabdocoelidans, though this term is no longer used in modern biological nomenclature.

Example:Prostomiacs include various species with body structures resembling those of rhabdocoelidans, but such a term is not recognized in formal taxonomic classification.

Definition:An informal term sometimes used to collectively refer to worms with features similar to rhabdocoelidans, though it is not a scientifically recognized category.