1. Animal Kingdom Phylum Porifera Phylum Cnidaria Biology 112

2. Phylum Porifera (sponges)

3. Phylum Porifera – SPONGES There are about 10,000 species of the phylum Porifera (sponges), all of which are aquatic or marinePorifera Only phylum in the subkingdom Parazoa (multicellular / not very specialized!) Sponges are the simplest of multi-cellular animals

4. Sponges… Sponge bodies are very diverse in form Most are asymmetrical Do not have a mesoderm No organs, can produce toxins A sponge is a bottom-dwelling creature which attaches itself to something solid in a place where it can, hopefully, receive enough food to grow. (larval stage is motile)

5. Sponges… The scientific term for sponges is Porifera which literally means "pore- bearing." A sponge is covered with tiny pores, called ostia, which lead internally to a system of canals and eventually out to one or more larger holes, called oscula

6. Sponges… In canals of sponges are specialized choanocytes, commonly known as collar cells. They are sticky, funnel shapes with flagellum. Functions of choanocytes (collar cells): 1. Beating flagellum forces water into the sponge (bringing nutrients and oxygen & carrying out waste 2. sticky collars of the collar cells pick up tiny bits of food brought in with the water

7. Sponges.. Another type of cell is an archaeocyte, also called an amebocyte, takes the food to other cells within the sponge How do you think these cells move? Amebocytes are very effective feeders eating a wide size range of food particles and transport digested food throughout the sponge.

8. Sponge Skeletons The skeleton is made of tiny needle like splinters called spicules (hard), a mesh of protein called spongin (soft), or a combination of both! Your bath sponge is actually dried skeletons composed of the protein material spongin. (The living remains of the sponge is gone)

9. Cross Section of a Sponge: Sponge filtering - http://www.youtube.com/watch?v=T7E1rq7zHLc&feature=fvw

10. Sponge Sex…. Most are hermaphroditic, but produce only one type of gamete per spawn. Asexually – regeneration Sexually – sperm and eggs The sperm is released into the water column by the "male" sponge and finds its way to the "female" sponges, where fertilization occurs internally

12. Ecological Importance Provide habitats for marine animals such as snails, shrimp, and shrimp Spicules can redirect sunlight to photosynthetic organisms below

13. Phylum Cnidaria (jellyfish, coral and other stingers…)

14. Phylum Cnidaria Class Scyphozoa (cup animals) Jellyfish Class Hydrozoa Hydras Class Anthozoa (flower animals) Sea Anemones, Coral

15. Phylum Cnidarian There are about 10,000 species of the phylum Cnidaria, almost all of which are marine. (less than 50 are freshwater) They represent the next highest level of organization in animals They possess true tissues Most radially symmetric Soft-bodied Carnivorous animals that have stinging tentacles.

17. Cnidarians… The name Cnidaria comes from the Greek word "cnidos," which means stinging nettle. Cnidaria have cnidocytes, stinging cells located on along tentacles. Each cnidocyte contains a nematocyst, a poison filled structure that has a coiled dart. Cnidocytes are arranged around their mouths Casually touching many cnidarians will make it clear how they got their name when their nematocysts eject barbed threads tipped with poison.

19. Cnidarians… They are diploblastic, meaning they develop from two embryonic germ layers, endoderm and ectoderm. The layer in the middle is a jellylike layer called a mesoglea

21. Life Stages of Cnidarian Two different types of life cycles Polyp is usually sessile Medusa is motile

22. Two Basic Body Forms of Cnidaria

23. Cnidarians… Reproduction Most cnidarians reproduce both sexually and asexually. Polyps can reproduce asexually by budding. In most cnidarians, sexual reproduction takes place with external fertilization. External fertilization takes place outside the female's and male’s body.

25. Class Hydrozoa Portuguese man o’ war Varadero, Cuba

26. Class Hydrozoa Portuguese man o’ war National Geographic - http://www.youtube.com/watch?v=RBdCpcapB0s Brought up on the beach by wind.