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Marine Invertebrates

Marine Invertebrates. (Sponges and Rotifers). Sponges. Sponges are multi-cellular, and come in many sizes, colors, and shapes. Sponges have few specialized structures, and are found in warmer, tropical waters. Sponges are made up of 2 layers: Endoderm - inner layer Ectoderm - outer layer

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Marine Invertebrates

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  1. Marine Invertebrates (Sponges and Rotifers)

  2. Sponges • Sponges are multi-cellular, and come in many sizes, colors, and shapes. • Sponges have few specialized structures, and are found in warmer, tropical waters. • Sponges are made up of 2 layers: • Endoderm- inner layer • Ectoderm- outer layer • Between the 2 layers is a jelly-like material called mesenchyme.

  3. Sponges belong to the phylum Porifera, which means “pore bearing”. • Sponges are considered Benthic organisms, they are bottom dwelling.

  4. Sponge Anatomy

  5. How do Sponges Feed? • Sponges are sessile- they spend their lives attached to an object. • Sponges bodies contain many holes. • Sponges bodies are elastic. • All parts of a sponge are the same. • They feed by taking in the plankton and algae found in water through small pores called ostia. • Water and wastes exit through a large hole called the osculum.

  6. 7. Collar Cells line the inside of the sponge and have flagella that sweep food into and pump water out of the sponge. • Digestion takes place inside the food vacuoles in each individual cell. • Gases are also exchanged at the cellular level. • Sponges have no nervous tissue, they do not respond to touch, and will not move.

  7. How do Sponges Reproduce? • Sponges can be male, female, or both (hermaphroditic). • They can also reproduce asexually by regeneration.

  8. Let’s go to the Video!

  9. Rotifers • Rotifer means “wheel bearer”. • Rotifers live in the moist sands along the shore, as well as, in freshwater. • They belong to the phylum Rotifera. • They can change the shape of their bodies and telescope them to make it easier to move their cilia. • They are both sessile and motile.

  10. How do Rotifers Eat? • They are predators…they create a current by beating their cilia and take food in. • Food passes through a one way digestive tract. • Food is digested in the stomach or the intestines. • Wastes are eliminated through the anus.

  11. How do Rotifers Reproduce? • Rotifers can be male or female. • Males produce sperm in the testes. • Females produce eggs in the ovaries. • Gametes are released into the water where they fuse. • Rotifers fertilize externally. • They can also reproduce asexually by a method called parthenogenesis ( a complete egg is produced w/o fertilization and has a complete set of chromosomes).

  12. Rotifers

  13. Let’s go to the Video!

  14. Blue Tube http://www.youtube.com/watch?v=T7E1rq7zHLc http://www.youtube.com/watch?v=KOFF2XNYJGO&feature=related

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