• 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
• 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 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.
• 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 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: Cnidarians
CLASS: Hydrozoa
• ORDER: hydroida
• FAMILY: Aequorea
• GENUS: Aequorea
• SPECIES victoria
• COMMON: water
jellyfish
•
•
•
•
•
•
•
•
KINGDOM: Animalia
PHYLUM: Cnidarians
CLASS: Medusozoa
ORDER: semaestomeae
FAMILY: ulmariadea
GENUS: Aurelia
SPECIES: aurita
COMMON sea
jellyfish
• KINGDOM: Animalia
• PHYLUM: Cnidarians
CLASS: Anthozoa
• ORDER: actiniaria
• FAMILY: actiniidea
• GENUS: Anthopleura
• SPECIES sola
• COMMON corals
• 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].
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