BIO 315 Lecture Notes - Lecture 2: Helminths, Paragonimus, Plant Reproductive Morphology
23 Jan 2020
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Parasitic worms (flatworms and roundworms: multicellular animals, egg larvae adult, why do we study them in microbiology, microscopic stages in life cycles, helminths generally possess: Complex reproductive system: monoecious (both male and female reproductive systems in one animal) and dioecious (separate male and female, domain: eukarya. Kingdom: animalia: phylum: platyhelminthes (flatworms, class: trematodes (flukes, phylum: nematodes (roundworms, trematodes (flukes, flat, leaf shaped, ventral and oral sucker, paragonimus spp. Eggs from proglottids are ingested, hatch into larvae, and bore into the intestinal wall. Taenia saginata (beef tapeworm: taenia saginata can live in the human intestine for 25 years and reaches a length of 6 meters (2 mm scolex followed by about thousand proglottids) Eggs are ingested and hatch in the intestine. Larvae migrate to the liver or lungs and develop a hydatid cysts: echinococcus granulosus (2-8 mm) Larva is infective: nematodes: eggs infective for humans, the pinworm enterobius vermicularis . Adult pinworms are found in the large intestine.
