BIO2231 Chapter Notes -Oligochaeta, Polychaete, Triploblasty
Document Summary
Organ systems a group of organs that work together to perform a specific function in a living thing. Hydrostatic skeleton a mass of fluid or plastic parenchyma enclosed within a muscular wall to provide the support necessary for antagonistic muscle action; for example, parenchyma in acoelomates and perivisceral fluids in pseudocoelomates serve as hydrostatic skeletons. Tagmatization organisation of the arthropod body into tagmata. Tagmata a compound body section of an arthropod resulting from embryonic fusion of two or more segments; for example, head, thorax, abdomen. Parapodia one of the paired lateral processes on each side of most segments in polychaete annelids; variously modified for locomotion, respiration, or feeding. Clitellum thickened saddlelike portion of certain midbody segments of many oligochaetes and leeches. Produce the cocoon in which eggs are deposited during sexual reproduction. Coelom the body cavity in triploblastic animals, lined with mesodermal peritoneum. Metamerism condition of being composed of serially repeated parts (metameres); serial segmentation.
