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Triploblastic
Endoderm, ectoderm, and cellular mesoderm
Acoelomate
No true tissue
Cephalization
Nervous tissue and sensory organs closer at the front end of the animals body
Blind gut
Complex gut ( no anus)
Hermaphroditic
Complex reproductive system
Protonephridia
Excretion and osmoregulation
Gas exchange
Uses entire body surface
Class Turbellaria ( free-living flatworms)
free living
Aquatic
The mouth leads to the pharynx (throat)
Epidermis ciliated (move things down)
Gut = diverticula( branched intestine)
Polycaladia( multibranched)
Tricaldia( gut 3 branched)
Class Monogenea ( flukes)
Ventral sucker
Anterior prohaptor ( feeding)
Posterior hooked opisthaptor ( secure stay)
Parasitic to one host
Ectoparasitic on fish
Class Trematoda ( flukes)
Oral sucker and acetabulum
Lack of prohaptor and opisthaptor
Tegument ( protective outer layer)
Parasitic to 2 or 3 host
Intermediate host ( mollusc)
2nd host
definitive host ( vertebrate)
Class Cestoda ( tapeworms)
Endoparasitic of the intestine of verts
Teguments
Scolex( hook for feeding)
Strobila is composed of proglottids ( reproductive area)
Digestive tract absent