HYDRA
PHYLUM CNIDERIA
PHYLUM COELENTERATA
PHYLUM COELENTERATA
(coel meaning 'hollow' and enteron meaning 'gut')
Hydra through the microscope. |
v one opening (mouth)
v hollow body
v main cavity of the hydra's body is the digestive cavity
v consists of two layers: ectoderm (outer – protective epithelium) and endoderm (inner – primarily a digestive epithelium)
Habitat: Hydras live in freswater lakes, ponds and streams. They attatch to rocks and water plants with a sticky secretion from disklike base.Movement/Locomotion:
v gliding on the base due to a creeping ameboid movement of basal cells.
v bending over and attaching to the substrate with the mouth and tentacles and releasing the foot (which usually provides attachment), then the body bends over and makes a new place of attachment.
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