BIOL 371 Lecture Notes - Lecture 9: Body Fluid, Planaria, Turbellaria
Document Summary
Marine, freshwater and terrestrial ones (live in moist environments) Complexity of gut determines how they are grouped. They move along using a combination of cilia and mucus from rhabdites. They secrete a layer of mucus, cilia beats within it to propel the worm along. Planaria are carnivorous- they eat crustaceans, rotifers, and nematodes. Smell them, and attack them by entangling them in mucus. Wrap their body around the prey and extend their pharynx for digestion. Adults live in the bile duct and release fertilized eggs. Can live in the bile duct for 15-30years. Passed out the intestine and into the water (have to be water borne) In the snail it asexually reproduces and becomes a spotocysts in the snail tissues. Spotocysts divide into more spotocysts and rediae( which divides into more rediae) Until the rediae migrate through the snail into the digestive gland (liver equivalent) The rediae germ cells turn into swimming cercariae- like tadpole.
