1 / 11

Porifera: Very Simple Animals...(?)

Porifera: Very Simple Animals...(?). Water in, water out Sponges bring water in through their pores and move it out through the large top opening. This current provides: -Food -Respiration -Excretion -Circulation -Reproduction. -No nervous system -Many produce toxins

aletta
Download Presentation

Porifera: Very Simple Animals...(?)

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Porifera: Very Simple Animals...(?) Water in, water out Sponges bring water in through their pores and move it out through the large top opening. This current provides: -Food -Respiration -Excretion -Circulation -Reproduction

  2. -No nervous system -Many produce toxins -Create many symbiotic relationships (mutualism and commensalism) Sexual Reproduction -Sponges form both eggs and sperm -The sperm move on current to other sponges Asexual Reproduction -A “bud” comes off the sponge and grows -Produce “gemmules” in times of stress

  3. Cnidarians: -Jellies -Hydra -Anemones -Corals

  4. Cnidarians: • Soft-bodied carnivores • Have tentacles with specialized cells called nematocysts that shoot poisonous darts into prey (p. 669) • Radial symmetry with a central mouth surrounded by tentacles • -Have two stages in their life-cycle: a polyp and a medusa. (p.670)

  5. -Cnidarians paralyze prey with poison, then pull it to their mouths and into the gastrovascular cavity where it is digested. http://www.youtube.com/watch?v=o1A5acWEERA&feature=related -They have a nerve net of specialized cells that allow them to detect touch, light and gravity. -Use a hydrostatic skeleton to contract muscles for movement. http://www.youtube.com/watch?v=760lUxyle6I

  6. -Sexual reproduction occurs through external fertilization where the zygote is a free-swimming larva -The larva attaches to a surface and forms a polyp. -The polyp can reproduce asexually by budding young medusae.

  7. The Jellyfish: Scyphozoa (the “cup animals”) -Range from tiny to almost 4 meters across -Some species are extremely venomous- The box jellyfish is the most venomous animal in the world and has killed over 5 500 people since the 1950s.

  8. Hydra and their Relatives -Hydras belong to the class Hydrozoa -Most hydrozoans are colonies of polyps performing specialized functions (Portuguese Man O’ War) -Hydra are freshwater hydrozoans that don’t have a medusa stage. They only live as polyps.

  9. Anemones and Corals -This is the class Anthozoa (“flower animal”) -Corals and anemones only have the polyp stage -Anemones are solitary polyps -Corals form colonies of polyps that look like tiny anemones. -Colonies grow over thousands of years producing calcium carbonate structures that build huge reefs that are threatened. -Corals form mutualistic relationships with algae. -Anthozoans release clouds of sperm and eggs into the water where the zygote becomes a swimming larva before turning into a polyp.

More Related