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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.
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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:
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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
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Dawkins, R. The Jellyfish’s Tale. In "The Ancestor's Tale." (2004) Houghton
Mifflin Company, New York, New York. pp. 388-390
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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
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[p. 316].