BIO 1130 Lecture Notes - Lecture 3: Myoepithelial Cell, Seafloor Spreading, Bilateria

• School: University of Ottawa
• Department: Biology
• Course: BIO 1130
• Professor: Jon Houseman

Document Summary

A specific body plan of bilaterally symmetrical animals or invertebrates that lack a coelem, which is a body cavity between the gut and body wall. Seen in flatworms, this means the mesoderm will fill up the space occurring between the ectoderm and endoderm and there will be no hollow body cavity. Phylogenies based on morphology suggest the acoelomate is ancestral but molecular trees disagree. A cluster or group of closely related species that each adapt and become specialized to a specific habitat or food source. These related groups evolve in a relatively short time and split apart to have different characteristics allowing them to better target food sources or survive in an environment. Ex. galapagos finches, which evolved from a common ancestor but now have unique appearances based on if they eat insects, seeds or fruits. Amoebocytes are migratory or mobile cells which circulate in body cavities of coelomates, by extending their cytoplasm or pseudopodia (false feet).