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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)

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invertebrates1
Invertebrates
  • Major Phyla
    • Porifera = Sponges
    • Cnidarians = Jellyfish
    • Mollusks = Squids, clams, snails
    • Annelids = Earthworms, leeches
    • Arthropods = insects, crustaceans
phylum porifera
Phylum Porifera
  • AKA: Sponges
  • Most primitive animals (>570myo)
    • Related to subgroup of animal-like protista
  • ~9000 species (most saltwater)
  • Sessile (stationary)
  • Asymmetrical
phylum porifera1
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 porifera2
Phylum Porifera
  • AKA: Sponges
  • Most primitive animals (>570myo)
    • Related to subgroup of animal-like protista
  • ~9000 species (most saltwater)
  • Sessile (stationary)
  • Assemtrical
  • Reproduction:
    • Sexual: sperm released into water
      • Larva attaches to surface and grows into adult
    • Asexual: Budding

Sponge

sponge structure
Sponge Structure

WATER

  • Filter feeders:
    • Water sucked in through many pores
    • Water exits through osculum

WATER

WATER

sponge structure1
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
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