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PORIFERA and CNIDARIA

PORIFERA and CNIDARIA. GERM LAYERS. Porifera. cnidaria. Two layers: Ectoderm Endoderm . None . SYMMETRY. porifera. cnidaria. Radial symmetry. No symmetry. COELOM: A fluid filled cavity in the body. Porifera. cnidaria. Acoelomate *Acoelomate: No coelom. Acoelomate.

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PORIFERA and CNIDARIA

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  1. PORIFERA and CNIDARIA

  2. GERM LAYERS Porifera cnidaria Two layers: Ectoderm Endoderm • None

  3. SYMMETRY porifera cnidaria Radial symmetry • No symmetry

  4. COELOM: A fluid filled cavity in the body Porifera cnidaria Acoelomate *Acoelomate: No coelom • Acoelomate

  5. DIGESTIVE TRACT porifera Cnidaria Gastro vascular (functions in both digestion and distribution of nutrients) with a saclike digestive system with one opening. • No digestive tract. They filter feed instead. They rely on maintaining a constant water flow through their bodies to obtain food and oxygen and to remove waste.

  6. CEPHALIZATION porifera cnidaria None • None

  7. SEGMENTATION porifera cnidaria None • None

  8. SKELETON AND APPENDAGES porifera cnidaria Hydrostatic skeleton acts like a water-filled balloon to support body Some jellyfish have appendages known as “Oral arms” that hang from the bell near the mouth, and bring the captured prey to the mouth. • Have a substance called mesohyl that acts as an endoskeleton; mesohyl is stiffened by mineral spicules. • No appendages

  9. CIRCULATORY SYSTEM porifera Cnidaria Cnidarians lack a circulatory system. All the cells of cnidarians are in contact with the water, which has all of the oxygen and nutrients the simple animals needs. The use for a circulatory system is to transfer oxygen and nutrients to all the cells of the body, and take away the waste. • Don’t have a circulatory system; rely on maintaining a constant water flow through their bodies to obtain oxygen and to remove waste.

  10. RESPIATORY SYSTEM Porifera Cnidaria Same as porifera • Gases are exchanged with the environment through diffusion across individual cell membranes

  11. REPRODUCTION porifera cnidaria Sexual Asexual budding • Sexual • Internal, most sponges are hermaphrodites which gives them the ability to reproduce with any other sponge • Asexual • Budding- attach or separate from parent • Fragmentation- break off and become cold or dry and eventually become a new sponge

  12. HABITAT porifera cnidaria Fresh and salt water Reefs • Reef

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