Unique Characteristics:
Polyp form:
-tubular body shape
-mouth and tentacles directed upward
-small amount of mesoglea
-sessile
Medusa form:
-small amount of mesoglea
-sessile
Medusa form:
-bell-shaped body
-mouth and tentacles directed downward
-large amount of mesoglea
-motile
-motile
Life cycle of Obelia sp.
Divided into three class:
1)Class Hydrozoa (hydra, Obelia sp.)
2)Class Scyphozoa (jellyfish, Aurelia sp.)
3)Class Anthozoa (sea anemone, Actinia sp.)
Scientific name: Obelia sp.
Class: Hydrozoa
Phylum: Cnidaria
Kingdom: Animalia
Domain: Eukarya
Scientific name: Aurelia sp.
Class: Scphozoa
Phylum: Cnidaria
Kingdom: Animalia
Domain: Eukarya
Scientific name: Actinia sp.
Class: Anthozoa
Phylum: Cnidaria
Kingdom: Animalia
Domain: Eukarya