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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) – 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.
