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Invertebrate Animals

Invertebrate Animals. Phyla: Phylum Porifera Phylum Cnidaria Phylum Platyhelminthes Phylum Nematoda. Porifera. Cnidaria. Nomura Jellyfish. Nematoda. Platyhelminthes. Invertebrate Animals. Phylum Mollusca Phylum Annelida Phylum Arthropoda Phylum Echinodermata. Mollusca. Arthropoda.

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Invertebrate Animals

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  1. Invertebrate Animals Phyla: Phylum Porifera Phylum Cnidaria Phylum Platyhelminthes Phylum Nematoda Porifera Cnidaria Nomura Jellyfish Nematoda Platyhelminthes

  2. Invertebrate Animals Phylum Mollusca Phylum Annelida Phylum Arthropoda Phylum Echinodermata Mollusca Arthropoda Echinodermata Annelida Polychete worm

  3. Taxonomy • Kingdom – Animalia • Subkingdom – Parazoa (lacks tissues) • Phylum – Porifera(Pore-bearing)

  4. Characteristics • Simplest of all animals • Most are marine • Saltwater sponges - brightly colored • Freshwater sponges - small and dull green color • Size – 2 meters to 2 cm • Skeleton of protein fibers called spongin or spicules.

  5. Sponge Skeletons Silica Spicules Limestone Spicules SPONGIN

  6. Sponge Skeletons VENUS FLOWER BASKET SPICULES

  7. Characteristics • Have pores all over their bodies • Water enters through pores bringing in food and oxygen • Osculum– large opening at the top where excess water leaves

  8. Water Flow Through the Sponge WATER OUT WATER IN Osculum

  9. Characteristics • Asymmetrical • Sessileas adults (attach to rocks) • Free-swimming larval stage

  10. Choanocytes line the gastrovascular cavity & capture food • Amebocytes digest & distribute food

  11. Nutrition: • Filter feeders on plankton • Choanocytes(collar cells) line inside of body cavity • Have flagella that spins to pull in water & food • Collar traps plankton (food) from water

  12. Amebocytes: • Pick up food from choanocytes • Finish digestion • Take food to other cells

  13. Sponge Reproduction Sponge releasing eggs & sperm • Sponges arehermaphrodites (produce both eggs & sperm) • Sponges reproduce Sexuallybyreleasing eggs & sperminto the water from the osculum • Cross-fertilizeeach other’s eggs

  14. Sponge Reproduction • Sponges can regenerate (regrow) lost body parts • Also reproduce asexually by budding and fragmentation (pieces break off & form a new sponge)

  15. Surviving Harsh Conditions • Gemmulesare specialized buds made to survive harsh weather (hot or cold) • Contain food, amebocytes, and a protective covering of spicules • Released when a sponge dies • Resist drying out • Become adult sponge onceconditions become favorable

  16. Branching Tube Sponge

  17. Stove Pipe Sponge

  18. Vase Sponges

  19. Barrel Sponges

  20. Ball Sponges

  21. Rope Sponges

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