SLE204 Lecture Notes - Lecture 10: Caudofoveata, Respiratory System, Solenogastres

• School: Deakin University
• Department: Science, Engineering and Built Environment
• Course: SLE204
• Professor: Anneke Veenstra

Document Summary

Main characteristics: second largest phylum (after arthropoda, bilateral symmetry (at some stage in lifecycle usually larval stage, well-developed head with: Nerve ring with nerve cords extending from it: reduced coelom (around heart and part of gut) coelomates, no metameric segmentation, head-foot complex: feeding, sensory and locomotor organs. Muscular foot -> for movement or attachment to substrate. Mucous glands -> secrete mucous for adhesion or a slime tract for those that glide on cilia. Radula rasping tongue-like organ (not in bivalves) > used for rasping food off rocks etc. and moving it towards their mouth. > specialized feeding structure: mantle terrestrial forms) Hangs down on each side of body, protecting the soft parts. Secretes shell (protein matrix reinforced with calcium carbonate) Houses respiratory organs -> gills (called ctenidia) or (cid:498)lungs(cid:499) (for. Digestive system mouth and anus; large digestive gland; ciliary. Circulatory system open; 2 auricles and ventricle; some blood. Respiratory system occurs in ctenidia, gills, lungs and across body.