BIO 3102 Study Guide - Annelid, Ecdysozoa, Devonian
Document Summary
Three small groups of marine coelomate [has a fluid filled body cavity] animal from the phyla. All have a lophophore:- a circular u-shaped fold with one or two rows of hollow,ciliated tentacles surrounding the mouth. Molecular sequence data and the lophophore suggest that these phyla have a common ancestry. Lophophore [looks like a crown of tentacles at the anterior end of the animal] 1- the coelomic cavity extends into it. 2- is involved in the capture of food. 3- serves as a site for gas exchange. 4- they are sessile suspension- feeders in adulthood. 5- have complete digestive system [u-shaped in most. anus is outside the ring of tentacles] Movement of cilia on the tentacles captures small organisms and debris then the cilia moves them to the mouth. 1 is secreted on the dorsal side. Other is secreted on the ventral side. 2- has well developed organs [heart & specialized excretory organs] 3- egg and sperm produced by different organisms.
