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• The mouth opens at one end and leads to a digestive cavity. Every cnidarians has at least two layers of cells that form its body wall. • The body of a cnidarians may be shaped like a cylinder, a bell, or an umbrella • An outer layer makes up the body covering, and an inner layer lines the digestive cavity. • Many cnidarians have a third, or middle, layer consisting of a stiff, jellylike material that helps support the animal. • Jelly fish are cnidarians that has a bell- or umbrella-shaped body • A polyp is a cnidarians that has a body shaped like a hollow cylinder. A polyp lives with one end of its body attached to the sea bottom Adaptations • some cnidarians to regenerate lost parts or even a complete body • Hydrodtatic Skeleton. This type of skeleton is a skeleton where muscles surround a water-filled body cavity and the muscles are supported by this cavity • Cnidarians have radial symmetry - that means they have symmetry revolving around a center point. • Cnidarians have 2 forms: Polyp (like sea anemone) and medusa (like jellyfish) • The size is 100 ft (30 m) long and more than a ton (910 kg) in weight • The name scyphozoa means cup animals which describes the medusa, the dominant form of life cycle of this class. • the size 12 millimeters to more than 2 meters across • The habitat is Arctic to the warm tropical seas of the Pacific and Indian Oceans • Their food source is Most jellyfishes are passive drifters that feed on living or dead preys: small fish, eggs, zooplankton and other invertebrates that become caught in their tentacles • The class hydrozoa includes about 3,700 species most of which live as colonial organisms in the ocean. • The size of a hydrozoa is 6 to 9 centimeters (2.4 to 3.5 in) • The habitat is Fern like hydrozoans can be found living on rocks and jetty piles • Food source is mainly feed on daphnia and Cyclops • The name anthozoa means flower animals which is a fitting description for the approximately 6,100 marine species in this class. Over thousands of years, these polyps build up large, rock like formations known as coral reefs. • The size is 10 in. (25 cm) in diameter • Their habitat less than 150 ft (46 m), where sunlight penetrates • Their food source is small fishes. Others consume organic debris Class hydrozoa / Scyphozoan • KINGDOM: Animalia • PHYLUM: Cnidarians CLASS: Hydrozoa • ORDER: Actinulidae • FAMILY: • GENUS: • SPECIES • COMMON: • • • • • • • • KINGDOM: Animalia PHYLUM: Cnidarians CLASS: Medusozoa ORDER: FAMILY: GENUS: SPECIES COMMON CLASS ANTHOZOA • KINGDOM: Animalia • PHYLUM: Cnidarians CLASS: Anthozoa • ORDER: • FAMILY: • GENUS: • SPECIES • COMMON • http://dai.ly/g7za45 • http://dai.ly/f5S0vQ • Dawkins, R. The Jellyfish’s Tale. In "The Ancestor's Tale." (2004) Houghton Mifflin Company, New York, New York. pp. 388-390 • Dunn, Casey, and Rebecca R. Helm. "Cnidarian." World Book Advanced. World Book, 2011. Web. 22 Mar. 2011. Arai, M.N. (1997). A Functional Biology of Scyphozoa. London: Chapman & Hall • [p. 316].