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ZOO 115 Invertebrate Zoology

ZOO 115 Invertebrate Zoology. Nematoda. hooge.developmentalbiology.com/meiofauna/media. Phylum Nematoda. Common name: round worms >20,000 species. Mostly widespread and abundant of all metazoans 90,000 worms in a decomposing apple.

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ZOO 115 Invertebrate Zoology

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  1. ZOO 115 Invertebrate Zoology Nematoda

  2. hooge.developmentalbiology.com/meiofauna/media Phylum Nematoda • Common name: round worms • >20,000 species. • Mostly widespread and abundant of all metazoans • 90,000 worms in a decomposing apple. • Marine and freshwater benthos, soil, parasites on plants and animals

  3. /creatures.ifas.ufl.edu/nematode Nerve cords Digestive tract Ovaries Excretory canal Phylum Nematoda - Anatomy • Most freeliving <2.5 mm in length. Some parasites > 50 cm in length. • Body is cylindrical with a pseudocoel • Complex cuticle • Must molt (Ecdysis) • Anterior end is radially symmetrical but the rest of the body has bilateral symmetry

  4. Sensilla /creatures.ifas.ufl.edu/nematode Sensilla • Ring-like brain • Sensilla • Chemosensory • Males also have them near the anus /creatures.ifas.ufl.edu/nematode Brain • Dorsal, ventral and lateral nerve cords www.unice.fr/LEML/coursJDV/images/biologie/ www.unice.fr/LEML/coursJDV/images/biologie/ Phylum Nematoda - Head RegionNervous system

  5. /creatures.ifas.ufl.edu/nematode Stylet - like a Hypodermic needle • Muscular pharynx 3 to 6 lips Pharynx /creatures.ifas.ufl.edu/nematode Buccal Cavity Phylum Nematoda - Head Region • 3-6 lips at the mouth • Buccal Cavity varies depending on prey • Bacteria - no teeth or stylet • Plant root - stylet • Carnivore - small teeth and sometimes stylet • Intestine - large hook-like teeth

  6. /creatures.ifas.ufl.edu/nematode /creatures.ifas.ufl.edu/nematode /creatures.ifas.ufl.edu/nematode • Foregut (buccal cavity and pharynx shown earlier) • Midgut -Intestine Cuticle Anus • Hindgut - Rectum Rectum Intestine Phylum Nematoda - Digestive tract

  7. www.ustboniface.mb.ca/cusb/abernier/Animaux/Pseudocoelom Longitudinal Muscles Nerve cords Digestive tract Ovaries Excretory canal Phylum Nematoda – Excretion • Excretory glands and canals thought to be involved in: • Osmoregulation • Ionic regulation • Excretion of waste metabolites • Ammonia secreted through body wall

  8. www.ustboniface.mb.ca/cusb/abernier/Animaux/Pseudocoelom Longitudinal Muscles Nerve cords Digestive tract Ovaries Excretory canal Phylum Nematoda – Musculature • Longitudinal muscles only!

  9. Spicule Testis www.apsnet.org/education/LessonsPlantPath/PineWilt/images/ Rectum - Cloaca creatures.ifas.ufl.edu/nematode/ Phylum Nematoda - Reproduction • Separate sexes - usually • Males have hook-like posterior • Testis • Male Rectum - Cloaca • Reproduction • Digestive waste • Spicule for sperm transfer • Retractable

  10. creatures.ifas.ufl.edu/nematode/ Ovary Seminal recepticle Eggs Vulva creatures.ifas.ufl.edu/nematode/ Phylum Nematoda - Reproduction • Females • Ovaries • Eggs • Vulva • Seminal Receptacle

  11. Baylisacaris procyonis Racoon parasite www.extension.umn.edu/distribution/cropsystems/images Human Parasite Plant parasite Ascaris lumbricoides Phylum Nematoda - Parasites: Roundworm Life Cycles

  12. www.biosci.ohio-state.edu/~parasite/lifecycles Phylum Nematoda - Parasites: Hookworm

  13. Phylum Nematoda - Parasites: Trichinella

  14. www.cvm.okstate.edu/~users/jcfox/htdocs/DISK1/IMAGES/ Phylum Nematoda - Parasites: Filariasis

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