Transcript Invertebrates - Cloudfront.net

Invertebrates
Invertebrates
• Major Phyla
– Porifera = Sponges
– Cnidarians = Jellyfish
– Mollusks = Squids,
clams, snails
– Annelids =
Earthworms, leeches
– Arthropods = insects,
crustaceans
Phylum Porifera
• AKA: Sponges
• Most primitive animals
(>570myo)
– Related to subgroup of
animal-like protista
• ~9000 species (most
saltwater)
• Sessile (stationary)
• Asymmetrical
Phylum Porifera
• AKA: Sponges
• Most primitive animals
(>570myo)
– Related to subgroup of
animal-like protista
• ~9000 species (most
saltwater)
• Sessile (stationary)
• Assemtrical
• Reproduction:
– Sexual: egg and sperm
released into water
• Larva attaches to surface
and grows into sessile
adult
Phylum Porifera
• AKA: Sponges
• Most primitive animals
(>570myo)
– Related to subgroup of
animal-like protista
Sponge
• ~9000 species (most
saltwater)
• Sessile (stationary)
• Assemtrical
• Reproduction:
– Sexual: sperm released
into water
• Larva attaches to surface
and grows into adult
– Asexual: Budding
Sponge Structure
W
A
T
E
R
• Filter feeders:
– Water sucked in through
many pores
– Water exits through osculum
Sponge Structure
• Filter feeders:
– Water sucked in through
many pores
– Water exits through
osculum
• Specialization:
– Pinacocytes (Outer layer):
Flat, protective cells
– Choanocytes (collar
cells): cilia create
currents to draw water
inside
• Similar to animal-like
protista
– Amoebocytes: absorb,
digest, transfer nutrients
to other cells
– Spicules: skeleton
Label the sponge parts.