BIOL 2P92 Lecture Notes - Lecture 12: Entoprocta, Bryozoa, Lophophore
22 Feb 2016
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Document Summary
All possess a crown of ciliated tentacles, called lopophore. Use in food capture and respiration: 6 phyla are lophotrochozoan protostomes. A lophophore is a crown of tentacles covered with cilia that is borne on a ridge or fold of the body wall: feeding device. Cavity inside the lophophore is part of the coelom; filled with coelomic fluid. Thin ciliated walls of the lophophore act as respiratory surface for gas exchange between environmental water and coelomic fluid. A lophophore can usually be extended for feeding and respiration: or withdrawn for protection, form clade called polyzoa. Ectoprocta and 2 other taxa that possess ciliated tentacles (cycliophora and entoprocta) The sister taxon to brachiozoa differs among phylogenetic analyses; nemertea. Three taxa form clade kryptrochozoa: very thin, stretchy, marine worms, trochozoa, mollusca, annelida, sipuncula. Trochophore free swimming feeding, larval stage having a ring of large ciliated cells in front of the mouth.
