Phyla Porifera and Cnidaria Free Powerpoint Templates Page

Phyla Porifera and Cnidaria Free Powerpoint Templates Page 1

Features of Sponges • Sponges depend on numerous pores or openings – They will pump water through those openings to obtain food and oxygen • Special cells called collar cells have a flagellum that moves water in and a sticky part that catches microscopic food particles Free Powerpoint Templates Page 2

Structure of Sponges • Sponges have skeletons that are made of: – spongin (a flexible, fibrous protein) – Spicules (stiff pointed little spikes) – Or BOTH Free Powerpoint Templates Page 3

Sponges – Video Free Powerpoint Templates Page 4

• • • Where do real sponges live? How did they clean the sponges? Sponges are actually ____. Sponges cannot _____ or _____. Sponges are known as ____ feeders. What are some predators of sponges? Free Powerpoint Templates Page 5

PHYLUM CNIDARIA Free Powerpoint Templates Page 6

Features of Cnidarians • Primary support for their bodies is a jelly-like mass that fills the space between their tissues hydrostatic skeleton Free Powerpoint Templates Page 7

Tissues of Cnidarians • Have a large central cavity surrounded by 2 layers of tissues – Ectoderm (outer layer) – Endoderm (inner layer) • Gastrovascular cavity – Mouth – only opening Free Powerpoint Templates Page 8

Food/Defense • God has designed cnidarians with special stinging organelles filled with venom called nematocysts – Each one has a trigger that when stimulated will release a long, whiplike barb out and inject toxic venom to whatever made it fire Free Powerpoint Templates Page 9

Other Cnidarians • Other cnidarians include: – Hydras – Corals – Sea anemones • Each captures prey with stinging tentacles • All have radial symmetry – Definite top and bottom – No definite sides Free Powerpoint Templates Page 10

Corals • 2 main groups: – Hard corals (limestone base) – Soft corals (no limestone base) • Both types have a soft body called a polyp made of 2 layers of tissue • Both have stinging tentacles for defense and finding food • Hard corals help create vast reefs throughout Earth’s oceans Free Powerpoint Templates Page 11

Free Powerpoint Templates Page 12

Nematocyst in Action Free Powerpoint Templates Page 13