BIO 2135 Lecture Notes - Lecture 9: Gemmule, Pylorus, Bryozoa
12 Oct 2017
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Document Summary
Left red group have radial symmetry (including bryozoa) U shaped gut created so that organism was not sitting on their buttholes, it turned into a u. Enteron (?) circles expand and ll in then pinch off. Can extend lophophore out to feed then contract it back in to protect it. Live in a casing referred to as the cystic. Zoarium: name for all individuals in the colony. Zooecium: the non living part of the cystic (the shell) plus the layer the produces it (?) Has series of hollow tentacles and these are extensions of the mesocoel. Cilia create a water current which bring in food and water, cilia on tentacles catch food and beat to pass food to gut. Water stream swishes excretions from anus away from mouth. Pyloric stomach takes undigested food and tries ones last time to digest any undigested parts. Don"t be confused- this is not a linear sequence even though it looks it.
