BIO153H5 Chapter Notes -Swim Bladder, Sagittal Crest, Depth Perception
Document Summary
34. 2a: echinoderms have an endoskeleton made of plates of calcium carbonate secreted inside the skin. (fig. 34. 2b: echinoderms have a system of branching, fluid-filled tubes, and chambers called the water vascular system. (fig. Freeman, biological science, 4e, chapter 34: podia are also used in suspension feeding or deposit feeding, or to move food toward cilia that then sweep it into the mouth. (fig. 34. 4b: key lineages, echinoderms include five major lineages. (fig. 34. 6: habitat: they are entirely marine, living on hard or soft substrates along coasts, morphology: five or more long arms radiate from a central region. Most do not have the long spines characteristic of other echinoderms: feeding: sea stars are predators or scavengers. Many prey on bivalves, sponges, barnacles, or snails. They may function as keystone predators that increase biodiversity by keeping prey species in check: movement: they crawl with tube feet, reproduction: reproduction is sexual, with separate sexes.
