Roundworms

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Roundworms

• Phylum Nematoda

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Nematodes

• Tube within a tube body plan
• psuedocoelom hollow, fluid filled cavity
• most are free living, some are parasitic

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Stomach Worm

• Ascaris lumbricoides
• Trichinosis - from consuming raw meat, causes
  muscle pain stiffness.

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Filarial Worms

• Elephantiasis
• Heartworm in dogs cats
• These worms live in and affect the lymphatic
  system, fluid builds up

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Hook Worms

• Feed on the hosts blood
• Can cause anemia

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Pin Worm

• Affect the lower part of the intestine
• Prevalent in small children
• Lay eggs around the anus causing kids to scratch
  and then spread the eggs

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Classification

• Common Name Stomach Worm
• Scientific Name Ascaris lumbricoides
• Phylum Nematoda
• Class Ascarid
• Other Classification Roundworms

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Characteristics

• Body Plan Unsegmented, round
• Body Cavity Psuedocoelom false cavity
• Symmetry Bilateral
• Cell Specialization Organs mostly
  reproductive parasitic lifestyle with human as
  host

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Life Support Processes

• Absorption Digestive tract
• Feeding parasitic
• Digestion mouth --gt digestive tract --gt anus
• Respiration Circulation Diffusion through the
  body wall, moist skin
• Excretion Body wall, anus

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Male vs Female
Male shorter than female and the end is hooked
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Life Support Processes

• Secretion digestive enzymes, cuticle
• Response Ganglia groups of nerve cells, skin
• Movement longitudinal muscles, thrashing motion
• Reproduction Sexual, separate males and females
• Support Hydrostatic skeleton

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Ecological Relationships

• Parasite with humans as host
• Complex life cycle
• Spread through contaminated food, water, and
  through the skin

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Body Systems Compared With Humans

• Intestines
• Reproductive Organs

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Advancements Over Previous Phylum

• 2 Opening digestive tract
• Muscles

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Ascaris Diagram
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Nasty Nematodes!

• Nematode sea worms are the most abundant animal
  on the planet with a population estimated to be
  over 400,000,000,000,000,000,000,000!
• One ascarid female can produce over 200,000 eggs
  in a single day!
• The largest roundworm, Placentonema gigantisma,
  is a parasite found in the placenta of sperm
  whales which can reach up to 9 m in length!