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Exploring the Fascinating World of Round Worms: A Comprehensive Overview

Discover the intricate details of Nematoda, commonly known as round worms, cylindrical in shape. They are long, worm-like animals with a cuticle secreted by an epidermis. With a complete digestive tract, this large group of about 12,000 species includes mostly free-living organisms. Dioecious in nature, their life cycle involves various stages from J2 to adult, with molting being a crucial process. Explore the taxonomy, morphology, and characteristics of notable species like Ascaris lumbricoides, Enterobius vermicularis, and more.

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Exploring the Fascinating World of Round Worms: A Comprehensive Overview

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  1. Phylum Nematoda

  2. common name “round worms” cylindrical in shape, typical long worm-like animals

  3. have a CUTICLE secreted by an epidermis.   Digestive tract is complete. large group of about 12,000 species most free-living Dioecious = sexes separate

  4. J2 J3 J4 adult usually involve larval or juvenile stages which look generally like adults molting = ecdysis no reproduction here J1 infective stage

  5. OLD TERMINOLOGY rhabdidiform larvae (looks like Rhabditus sp.) esophagus that constricts posterity and then enlarge into a bulb. often newly hatched

  6. filariform larvae longer and thinner with an esophagus not constricted or bulbed. often infective form

  7. some free-living larvae some symbiotic larvae in intermediate hosts some undergo “migration” through host body

  8. intestinal Ascaris lumbricoides Enterobius vermicularis Ancylostoma duodenale hookworm Necator americanus hookworm Trichuris trichura Strongyloides stercoralis cutaneous larva migrans blood and tissue flarial worms Wuchereria bancrofti Onchocerca volvulus Loa loa Mansonella ozzardi Dracunculs medinensis Trichinella spiralis tissue phase

  9. the end

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