CHANGING PATTERNS IN THE DEVELOPMENT OF ZOOIDAL BUDS IN THE EVOLUTION OF THE BRYOZOAN ORDER CHEILOSTOMATA AND THE APPEARANCE OF MULTISERIAL FORMS

Abstract

The transition from uniserial to multiserial forms in the evolution of the bryozoan order Cheilostomata resulted from the change from a proxipetal sequence of development of buds in zooids to a distopetal. Possible morphogenetic mechanisms of this transformation are discussed.