Transcript Cnidaria
PORIFERA None CNIDARIA Two layers: Ectoderm Endoderm PORIFERA No symmetry CNIDARIA Radial symmetry PORIFERA CNIDARIA Acoelomate Acoelomate *Acoelomate: No coelom PORIFERA 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. CNIDARIA Gastro vascular (functions in both digestion and distribution of nutrients) with a saclike digestive system with one opening. PORIFERA None CNIDARIA None PORIFERA None CNIDARIA None PORIFERA Have a substance called mesohyl that acts as an endoskeleton; mesohyl is stiffened by mineral spicules. No appendages CNIDARIA Hydrostatic skeleton acts like a waterfilled 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. PORIFERA Don’t have a circulatory system; rely on maintaining a constant water flow through their bodies to obtain oxygen and to remove waste. 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. PORIFERA Gases are exchanged with the environment through diffusion across individual cell membranes CNIDARIA Same as porifera PORIFERA Sexual Internal, most sponges are hermaphrodites which gives them the ability to reproduce with any other sponge CNIDARIA Asexual Budding- attach or separate from parent Fragmentation- break off and become cold or dry and eventually become a new sponge Sexual Asexual budding PORIFERA Reef CNIDARIA Fresh and salt water Reefs