Cheilostomata

Cheilostomata, one of the three divisions of the Bryozoa belonging to the sub-class Ectoprocta. The main features of the order are these: - It has a calcareous or chitinous skeleton; the openings of the individual animals (zooecia) that build up the colonies are lateral instead of terminal; the modified zocecia, known as avicularia and vibracula, are here most developed; "ocecia" or marsupial pouches are present.