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Invertebrates

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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Invertebrates

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  1. Invertebrates

  2. Invertebrates • Major Phyla • Porifera = Sponges • Cnidarians = Jellyfish • Mollusks = Squids, clams, snails • Annelids = Earthworms, leeches • Arthropods = insects, crustaceans

  3. Phylum Porifera • AKA: Sponges • Most primitive animals (>570myo) • Related to subgroup of animal-like protista • ~9000 species (most saltwater) • Sessile (stationary) • Asymmetrical

  4. 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

  5. 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

  6. Sponge Structure WATER • Filter feeders: • Water sucked in through many pores • Water exits through osculum WATER WATER

  7. 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

  8. Label the sponge parts.

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