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Phylum Porifera

Phylum Porifera. By: Joseph Chi and Taha Ali. Number of germ layers . It has one central cavity called the spongocoel . However, it has no tissues/germ layers. Symmetry. Asymmetrical, meaning the body has no symmetry because sponges are not always even. Ceolum.

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Phylum Porifera

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  1. Phylum Porifera By: Joseph Chi and Taha Ali

  2. Number of germ layers • It has one central cavity called the spongocoel. However, it has no tissues/germ layers

  3. Symmetry • Asymmetrical, meaning the body has no symmetry because sponges are not always even.

  4. Ceolum • Phyla Porifera are Aceolomates which are characterized by having solid bodies.

  5. Digestive tract • Phylum Porifera (sponges) do not have a digestive system because they have no mouth or anus, rather digestion occurs within the sponge’s which is called intracellular digestion.

  6. Cephalization • Cephalization is the concentration of nerves at the anterior end of the body, which forms a head and a brain. • Porifera have no cephalization.

  7. Segmentation • Porifera are not divided into repeated segments.

  8. Skeleton & Appendages • none, the structures called spicules provide support inside the sponge, also has no appendages.

  9. Circulatory system and respiratory system • None, however the Porifera (sponge) diffuses the oxygen in the water into its cells as it moves through the body. • Porifera have no specific circulatory system or respiratory system. • They have a water flow system that supports these functions.

  10. Reproduction • Can be sexual or asexual • Sponges are hermaphroditic -produce eggs (ova) and sperm • produce ova and sperm at different times of the year. • Eggs and sperm are produced by the amoebocytes (Mobile cells) .

  11. Habitat • Live in marine and freshwater, usually in shallow water, and is sensitive to pollution.

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