BIOMI 3310 Lecture Notes - Lecture 10: Monopisthocotylea, Polyopisthocotylea, Trematoda
Document Summary
Trematodes: belong to the neodermata and spiralia. Types of monogenetic trematodes: monopisthocotylea: one sucker, polyopisthocotylea: many suckers. Triploblastic: members of bilateria, animals (unikonts, acoelomates, may lack a gut, no anus, blind sac, can"t synthesize fatty acids and sterols, ciliated free-living and larval stages, adults: syncytial tegument. Excretory system: flame cells: most are monoecious, a few are dioecious. Intermediate host: frogs: causes frogs to grow extra limbs, extended phenotype: slow frogs down, making it easier for blue herons to catch and eat them. Sexual reproduction: occurs in the vertebrate (final) host, sexual reproduction results in the production of eggs (generally operculated, eggs are passed in the feces of the final host, may be undeveloped or already embryonated. Typical adult digenetic fluke: has a mouth but no anus. Yolk cells are separate from the ovum within the eggshell. Typical life cycle: eggs passed in feces of vertebrate, most are passed in an undifferentiated state, eggs undergo development in water.
