BIO 1130 Lecture Notes - Yoho National Park, Ordovician, Archenteron

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

Document Summary

Animals without a body cavity that seperates the gut from the muscles of the body wall. Instead a mass of cells derived largely from mesoderm, packs the region between the gut and the body wall. Body plan that is irregular in shape and cannot be divided into equal parts. A body plan that has left and right sides that are mirror images of each other on either side of the body"s midline. Class that includes clams, scallops, oysters, and mussels. The opening at one end of the archenteron in the gastrula that gives rise to the mouth in protstomes and the anus in deuterostomes. The hollow ball of cells that is the result of cleavage divisions in an early embryo. Fossil"s that can be found at yoho national park in bc. During the cambrian period when many bizarre creatures began to appear. The development of an anterior head where sensory organs and nervous system tissue are concentrated.