BIO 1106 Lecture Notes - Lecture 2: Sea Anemone, Gastrovascular Cavity, Planula
Document Summary
Characteristics= asymmetrical, lack true tissues, have unique cells called choanocytes (flagellated cells that will draw in water and filter food particles) 36. 5: walls of sponges contain amoebocytes and crystallized structures called spicules, cross section slide, shows spicules in the sponge wall (fig. Spongia: have spongin fibers that are more flexible, specimen. Hydra: no medusae stage, living specimen on dissecting microscope, whole mount slide, cross-section slide (identify cell layers in fig. Obelia: polyp colony and small free-swimming medusae, whole mount slide showing polyp colony, gastrozoids= specialized feeding polyps, gonozoids= reproductive polyps, whole mount slide of medusae stage. Physalia: portuguese- man-o-war, floating colony of polyps. Class scyphozoa medusa morph dominates (jellyfish), polyp is a small larval stage. Aurelia: common jellyfish, slides showing stages of the life cycle, planula larvae (produced by sexual reproduction of medusa, scyphistoma (young polyp stage, ephyra (immature/young medusae stage buds from the polyp, mature medusa in jar.
