Transcript Invertebrates - Cloudfront.net

Phylum Cnidaria Characteristics
What the
Anemone
heck is this?
What the heck
Jellyfish
are these?
• Possess stinging cells
• Radial symmetry
• Two body forms:
– 1) Polyps: tubes with mouth and tentacles facing upward
– 2) Medusa: Umbrella-shaped with mouth and tentacles
downward
Asexual Reproduction
• Budding: new individual grows from the parent
• Genetically identical to parent
Sexual Reproduction
• Male medusa release sperm into
water
• Female absorb sperm and eggs
fertilized
• Larva grows inside females
Sexual Reproduction
Larva released
Sexual Reproduction
Larva develop into
polyps
Sexual Reproduction
Young medusa
begin to bud off
from polyp
Sexual Reproduction
FF to :40 seconds
Young medusa
begin to bud off
from polyp
Sexual Reproduction
Medusa grow and
mature
Jellyfish Life Cycle
Cnidarian Anatomy
• 2 tissue layers
(evolutionary
advancement)
• 1) Outer layer:
• Muscles
• Nerves
• Stinging cells
(cnidocytes)
• 2) Inner layer
• secretes digestive
enzymes
• absorbs nutrients
• Layer of “jelly” in
between (mesoglea)
• Gastrovascular cavity:
single opening to digest
food
Cnidarian Anatomy
• 2 tissue layers
(evolutionary
advancement)
• 1) Outer layer:
• Muscles
• Nerves
• Stinging cells
(cnidocytes)
• 2) Inner layer
• secretes digestive
enzymes
• absorbs nutrients
• Layer of “jelly” in
between (mesoglea)
• Gastrovascular cavity:
single opening to digest
food