BIOL 3900 Lecture Notes - Lecture 10: Fundamental Domain, Viral Tegument, Flatworm
Document Summary
Platyhelminthes (flatworms) phylum containing simplest bilaterally symmetrical animals. Acoelomate body plan (no body cavity other than the gut); rarely has anus. Dorsoventrally flattened (greater surface area to respire by diffusion) Tegument (outer surficial layer covering of a multicellular organism integument. [syncytial, used to absorb nutrients from surroundings] ) Parenchyma (loosely arranged mass of fibers and cells of several types) Turbellaria (not parasites), monogenea (fish parasites), cestoidea (tape worm), trematoda. Digenea, aspidogastrea (found in mollusks, like in clams) Digenetic trematodes (flukes): a subclass within the class trematoda. First host of a digenea trematoda is mollusk (most often a gastropod/snail) or very, rarely an annelid. Most dorsoventrally flattened and oval in shape; others as thick as they are wide. Oral sucker muscular sucker that surrounds the mouth. Acetabulum ventral sucker of a fluke (used to make sure parasite stays attached to target organ) Distome fluke with two suckers, oral and ventral.
