BIOL108 Lecture Notes - Lecture 21: Dipylidium Caninum, Cestoda, Gastrovascular Cavity

• School: University of Alberta
• Department: Biology (Biological Sciences)
• Course: BIOL108
• Professor: Lien Luong

Document Summary

Class turbellaria free-living flatworms freshwater & marine habitats. Ganglia is like a collection of nerve tissues. Surface of body covered in cilia (motility) No anal opening; undigested food ejected from the mouth. Endoparasites: live in the digestive system of other animals. Mostly of vertebrates, but invertebrates can act as intermediate hosts lack digestive system lack mouth. Scolex: front end of body modified for holding on to the host"s gut therefore absorb nutrients through thin body wall (intestinal wall); suckers and/or hooks. Posterior to scolex: long chain of units called proglottids devoted to reproduction. New proglottids produced at base of scolex. Proglottids can detach from the main body; motile. Need more than 2 hosts to complete its life cycle: eggs consumed by intermediate host (ih) Ih = in which parasite undergoes asexual reproduction; usually invertebrates: the eggs develop into larvae that encyst in tissue of ih.