Transcript Cnidarian

June 2, 2016
 Kingdom
 Phylum
– Animalia
– Cnidaria
1.
2.
3.
Radial symmetry
Examples: corals,
hydra, jelly fish, sea
anemones
Single opening
surrounded by
tentacles
No mesoderm tissue
5. Body types (some exhibit both body types during
life cycle)
a. Polyp – vase shape (like anemone)
i. Opening on dorsal surface and tentacles up
b. Medusa – umbrella shape (like jellyfish)
i. Mouth on ventral surface and tentacles down
4.
Carnivores
7. Have stinging cells (cnidocytes)
which sting prey
a. Are poisonous
b. Contain a capsule called a
nematocyst that contains the
stinging barb in a coiled tube
c. Sting prey & tentacles bring to
mouth
d. Lining of gastrovascular cavity
secretes enzymes to break
down food
e. Undigested food leaves
through the mouth
6.
Reproduction – both sexual and asexual
9. Diversity – most live as individual animals
10. Three classes
8.
a. Hydrozoa – both body forms together (Portuguese
Man of War)
b. Scyphozoa – mostly medusa form (jellyfish)
c. Anthozoa – only polyp form (sea anemones & corals)
Mouth
Cnidocyte
Nematocyst
Tentacle
Gastrovascular Cavity
Endoderm
Ectoderm
Bud
Mesoglea
Basal Disk
Ovary/Testse