1 / 9

Top 10 New Species 2008!

Top 10 New Species 2008!. Top Ten. Phylum Platyhelminthes. Biology 11. General Characteristics. About 20 000 species Simplest animals with bilateral symmetry Can move forward in certain direction Have organs and organ systems. 3 Classes. Flukes: class trematoda

sydney
Télécharger la présentation

Top 10 New Species 2008!

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. Top 10 New Species 2008! • Top Ten

  2. Phylum Platyhelminthes Biology 11

  3. General Characteristics • About 20 000 species • Simplest animals with bilateral symmetry • Can move forward in certain direction • Have organs and organ systems

  4. 3 Classes • Flukes: class trematoda • Tapeworms: class cestoda • Free Living Flatworms: class turbellaria

  5. Planaria - Adaptations • Eyespots • Flat shape, places all cells close to surrounding water • Highly branched GVC (gastrovascular cavity)

  6. Planaria - Response • Ganglia • Head with eyespots • Lateral flaps - function for smell • Avoid light

  7. Planaria - Nutrition • Carnivores that prey on smaller or dead animals • Mouth extends from medial ventral side with an external pharynx • Prey digested by enzymes in GVC (extracellular digestion) • Food absorbed by cells in branches of GVC • Waste released out through mouth

  8. Planaria - Locomotion • Move using cilia on ventral epidermis • Glide along mucus that they secrete • Some flop using muscles

  9. Planaria - Reproduction • Asexual regeneration • Sexual • hermaphrodites (but no self fertilization)

More Related