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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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