Bio.cnid.spong.review
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This document compares and contrasts the characteristics of sponges and cnidarians. Sponges and cnidarians are both aquatic invertebrate phyla that reproduce both sexually and asexually. However, sponges lack tissues, organs and organ systems like the nervous, digestive and circulatory systems that cnidarians possess. Cnidarians also have a radial symmetry and can reproduce through both polyp and medusa life stages using external fertilization.
Bio.cnid.spong.review
- 1. * Biology class May 10th, 2012
- 2. Characteristics Sponges Cnidarians Phylum Porifera Cnidaria Animal x x Invertebrates x x Species 5,000+ 9,000+ Symmetry Assymetrical Radial Aquatic (marine and freshwater) x x Movement Sessile (adult) / free swimmers Sessile (adult) / free (larvae) swimmers (larvae, adult) Variety of colors, shapes and x x sizes Sexual and asexual reproduction x x Layers 2 layers Endoderm / ectoderm (embryonic stage) Has no Tissues > organs > organ system: Central nervous system (does Nervous, digestive, muscular or have a nerve net) circulatory systems. *
- 3. * Sponges * Cnidarians Scyphozoa (jellyfish) Anthozoa (corals and sea anemone) Hydrozoa (hydra) Cubozoa (box * jellyfish)
- 4. * Sponges * Cnidarians Epithelial- like cells Pore cells Polyp Amoebocytes Collar cells Medusa *
- 5. * Sponges * Cnidarians * Asexually fragmentation, budding * Asexually budding. Polyp or or formation of gemmule. medusa stage. * Sexually Hermaphrodite. Internal * Sexually one phase of the life / external fertilization cycle. Polyp (if no medusa stage occurs) or medusa stage. External fertilization. *
- 6. * Sponge * Cnidarians * No digestive system * Prey captured by * Filter feeding nematocyst brought to the mouth by contraction of tentacles and then to the gastrovascular cavity. *
- 7. * Sponge * Sponge * No nervous system * No nervous system * Nerve net *