The Invertebrates Chapter 12A Introduction to the Animal Kingdom.

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Presentation transcript:

The Invertebrates Chapter 12A Introduction to the Animal Kingdom

Zoology The study of animals

Animals Eukaryotic and multicellular Eukaryotic and multicellular Have organized tissues Have organized tissues Consumers Consumers About 95% are invertebrates About 95% are invertebrates

Invertebrate An animal without a backbone

Invertebrates Have skeletons Have skeletons – May be internal or external Much variety Much variety

The Invertebrates Chapter 12B Sponges and Cnidarians

Phylum Porifera The pore-bearing animals

Sponges Porifera = “pore bearer” Porifera = “pore bearer” Live in water Live in water Sessile Sessile Can reproduce sexually or asexually Can reproduce sexually or asexually

Sponges Skeleton Skeleton – Spongin – Spicules Collar cells Collar cells Filter feeders Filter feeders

Phylum Cnidaria The stinging animals

Cnidaria Live in water Live in water Radial symmetry Radial symmetry – Umbrella-shaped Medusa Medusa – Tubular Polyp Polyp

Radial Symmetry (Hydra)

Cnidaria Free-swimming or sessile Free-swimming or sessile Can reproduce sexually or asexually Can reproduce sexually or asexually

Jellyfish Hydrostatic skeleton Hydrostatic skeleton Gastrovascular cavity Gastrovascular cavity – Only body opening is its mouth Nerves, but no brain Nerves, but no brain

Jellyfish Nematocysts Nematocysts – For food – For defense Swimming Swimming

Phylum Cnidaria Other Examples

Hydra

Portuguese Man of War

Coral

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