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Discover the diverse characteristics, adaptations, and interesting facts about cnidarians like jellyfish, polyps, and more. Explore the classes Scyphozoa, Hydrozoa, and Anthozoa in detail. Learn about their unique hydrostatic skeleton and radial symmetry.
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General characteristics • 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.
More characteristics • 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
3 Interesting facts • 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 is100 ft (30 m) long and more than a ton (910 kg) in weight
Class scyphozoa • The name scyphozoa means cup animals which describes the medusa, the dominant form of life cycle of this class. • The size they can reach to 40 meters • The habitat is cold artic waters • 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.
class hydrozoa • 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
Class Anthozoa • 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 200mm in length. • Their habitat less than 150 ft (46 m), where sunlight penetrates. • Their food source is small fishes. Others consume organic debris.
KINGDOM: Animalia PHYLUM: CnidariansCLASS: Hydrozoa ORDER: hydroida FAMILY: Aequorea GENUS: Aequorea SPECIES victoria COMMON: KINGDOM: Animalia PHYLUM: Cnidarians CLASS: Medusozoa ORDER: semaestomeae FAMILY: ulmariadea GENUS: Aurelia SPECIES: aurita COMMON Class hydrozoa / Scyphozoan
CLASS ANTHOZOA • KINGDOM: Animalia • PHYLUM: CnidariansCLASS: Anthozoa • ORDER: actiniaria • FAMILY: actiniidea • GENUS: Anthopleura • SPECIES sola • COMMON
videos • http://dai.ly/g7za45 • http://dai.ly/f5S0vQ
citations • 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]. • Myers, P., R. Espinosa, C. S. Parr, T. Jones, G. S. Hammond, and T. A. Dewey. 2008. The Animal Diversity Web (online). Accessed April 03, 2011 at http://animaldiversity.org. • Mills, C. 2008. "Hydromedusae" (On-line). Accessed July 10, 2009 at http://faculty.washington.edu/cemills/Hydromedusae.html