Phylum Porifera Sponges Phylum Cnidaria Jellyfish corals Dont

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Phylum Porifera Sponges Phylum Cnidaria Jellyfish, corals. . .

Phylum Porifera Sponges Phylum Cnidaria Jellyfish, corals. . .

 • Don’t forget – sponges are animals and belong to the Animal Kingdom

• Don’t forget – sponges are animals and belong to the Animal Kingdom 1. Multicellular 2. No organs or body systems 3. Cellular digestion (heterotrophic) 4. Asymmetry

Sponges are SESSILE – they do not move They obtain food by FILTER FEEDING

Sponges are SESSILE – they do not move They obtain food by FILTER FEEDING

Environment p All sponges live in aquatic environments n n Mostly marine Tend to

Environment p All sponges live in aquatic environments n n Mostly marine Tend to live in calm, quiet waters to prevent sand being swept up into pores.

Anatomy Body is an open cavity with pores on the outside that allow water

Anatomy Body is an open cavity with pores on the outside that allow water in p Body opening allows water in through the pores and out of the top (called an osculum) p Have a “skeleton” that is composed of either spongin or spicules p n Spongin forms soft skeleton and spicules form hard skeleton

Anatomy Amebocytes - cells within the sponge that move around supplying nutrients and taking

Anatomy Amebocytes - cells within the sponge that move around supplying nutrients and taking away waste

CHOANOCYTES – a. k. a. collar cells · layer of cells with flagella ·

CHOANOCYTES – a. k. a. collar cells · layer of cells with flagella · the movement of the flagella keeps a water current going in the sponge · food vacuoles in the collar cells digest plankton and other small organisms (filter feeder)

Sponge Anatomy

Sponge Anatomy

Digestion Sponges feed on organisms that are in the water that filters though the

Digestion Sponges feed on organisms that are in the water that filters though the pores. p However, they lack a true digestive system p

Respiration p Lack a true respiratory system n Rely on a constant water flow

Respiration p Lack a true respiratory system n Rely on a constant water flow through body to get oxygen and release carbon dioxide

Circulatory and Nervous Systems p Sponges lack true circulatory and nervous systems.

Circulatory and Nervous Systems p Sponges lack true circulatory and nervous systems.

Reproduction p Most reproduce sexually n n p Release sperm into water which fertilizes

Reproduction p Most reproduce sexually n n p Release sperm into water which fertilizes the ova of other sponges Fertilized egg forms larvae that swims and finds a place to settle and develop Can reproduce asexually by budding or regeneration.

Fun Facts Some species that have completely soft skeletons have been used by humans

Fun Facts Some species that have completely soft skeletons have been used by humans for padding and cleaning (by the 1950’s, they were overfished) p Some sponges are now being studied for medicinal purposes p Dolphins use sponges as a tool for protecting noses while getting food p

Multimedia Sponge Images and Videos http: //www. junglewalk. com/video/Sponge-movie. htm Cnidarian Images and Videos

Multimedia Sponge Images and Videos http: //www. junglewalk. com/video/Sponge-movie. htm Cnidarian Images and Videos http: //www. junglewalk. com/video/Coelantratemovie. htm General Invertebrate Movies at National Geographic --- really good video on the portuguese man of war (under invertebrates) Hydra Video at http: //www. schooltube. com/video/55045/Hydra