Platyhelminthes Emily Anderson Kelsey Crawford Emily Spillett Angela Spinney

Kingdom: Animalia Phylum: Platyhelminthes Class: -Cestoda -Monogenea -Trematoda -Turbellaria Classification

Monogenea  Parasitic  Ectoparasites and Endoparasites

Cestoda  Tapeworms  Lack digestive system and locomotor organs  Host intestines

 Commonly called flukes  18,000 to 24,000 species  Parasites of mullosks and vertebrates  Range from 1mm-7cm in size  Have two distinct suckers; on mouth and underside. Trematoda

 Commonly called Planarian  Live in saltwater and freshwater ponds and rivers  Receive oxygen and release carbon dioxide through diffusion  Eat small living or dead animals through their muscular mouths. Turbellaria

 Two basic forms of movement  Simple Nervous System  Flat bodied  Unsegmented bodied  Bilateral symmetry  Take in food and get rid of waste through mouth  Invertebrates Characteristics

 Free-living Forms  Parasitic Forms  Example: Monogenea Development/Life Cycle

 Sexual Reproduction  Asexual Reproduction Transverse Fission Budding Reproduction

Evolutionary History  Evolved from Hydra  550 million years ago  Bilateral Symmetry

 The longest tape worm ever found was over 90 feet long  If a flatworm is starved it is capable of shrinking to hatching size and when fed it has the ability to grow back to its original size Fun Facts !

 Some species switch from being a herbivore to a carnivore as they mature.  Scientists can train flatworms to do simple tasks, such as finding water in a maze. When these flatworms are then cut in half, the new halves learn faster than the original. Fun Facts Cont.

- Fbio1notes_flatworms.html Animals/03-Flatworms.html - worm/64445/Developmenthttp:// worm/64445/Development hel/Platyhel.htmlhttp://science.kennesaw.edu/~jdirnber/InvertZo/LecPlaty hel/Platyhel.html - E7P9Tmhttp:// E7P9Tm - Sources