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Sponges & Cnidarian Chapter 35
Sponges Invertebrates - animals without back bones.Simplest of the multicellular animals. No organ system. Kingdom: animalia Phylum: porifera
Movement Holdfast - root-like - attach the sponge to rocks.Adult sponges are sessile - unable to move.
Structure : Skeleton SponginSpicule – hard, spike-like, particles of calcium carbonate of silicon dioxide that make up a sponges skeleton
Structure Collar cells-create a current of water through the sponge.Thousands of pores let water flow through it continually. Water exits through the osculum – opening at the top of the sponge.
Filter Feeding Obtain nourishment and oxygen from this water.Engulfed by collar cells and passed to amebocytes which distribute the nutrients to the rest of the body.
Reproduction Budding Gemmules Regeneration Sexual reproduction
Sexual Reproduction Sperm released Egg is fertilizedLarva form and leave the sponge. Larva settles and attaches to an object. Larva grows into an adult sponge.
Examples of cnidariansJellyfish Sea anemones Coral animals
Characteristics of CnidarianInvertebrates Radial symmetry Tentacles with stinging cells.
The two different forms of a Cnidarian bodyBell shaped Specialized for swimming Vase shaped Sessile existence
Movement Most cnidarians are slow-moving or sessileFound on shallow ocean floors, the bottom of ponds or drifting about in water currents.
Characteristics Gastrovascular cavity center of the body Hollow gutOne opening surrounded by tentacles
Feeding and Defense Cnidocytes – cells found on tentacles used for defense & capturing prey. Nematocyst – organelle in cnidocyte which can eject a filament with poison.
Sponges Phylum Porifera.
Sponges Cnidarians Ctenophores
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Ch. 35 Porifera Invertebrates Animals without a backbone 97% of all species Simplest is sponge.
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