ENT378 Lecture Notes - Lecture 4: Gonochorism, Ovoviviparity, Parthenogenesis

• School: University of Alberta
• Department: Entomology (Biological Sciences)
• Course: ENT378
• Professor: Andrew Keddie

Document Summary

Have a body cavity and a complete digestive tract. Stomodeal esophagus or pharynx-divided into muscular and glandular regions. - possess nervous system, excretory system and longitudinal muscles. - size: 82 m - 8m (in placenta of sperm whale). - estimates of >500,000 species--anticipate future problems in taxonomy both of the nematodes and possibly for their hosts, especially if the host is an arthropod. - most are amphimictic (gonochoristic)-sperm and eggs from separate individuals. - ovoviviparous - may produce and release some eggs, others develop in the female, killing her as they release (matricidy). Female will self fertilized, then her kids will kill her when they ae l1/l2 microfiliaril hallmarks of pathogenic nematodes; Come in through the mouthpart of the mosquito; -hatch either: (i) spontaneously at end of embryonic development. (ii) embryonic development complete, remains quiescent until right conditions are present -- typical of parasitic forms. Parasitic all conditions have to be perfect;