Phyla Porifera and Cnidaria Free Powerpoint Templates

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

Structure of Sponges Sponges have skeletons that are made of: spongin (a flexible, fibrous protein) Spicules (stiff pointed little spikes) Or BOTH

Sponges – Video

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?

Phylum Cnidaria

Features of Cnidarians Primary support for their bodies is a jelly-like mass that fills the space between their tissues  hydrostatic skeleton

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

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, whip-like barb out and inject toxic venom to whatever made it fire

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

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

Nematocyst in Action