Phylum Nematoda

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Phylum Nematoda

• Roundworms
• Roundworms

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• monsters inside me roundworms

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Taxonomy

• Kingdom Animalia
• Phylum Nematoda
• Class Secernentea Class Adenophorea
• Filarial worms Trichinella worm
• Roundworms
• Hookworms
• Pinworms

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General Characteristics

• Live in fresh and salt water, soil and inside
  organisms
• Live in every habitable environment
• Over 8,000 named species
• Parasites to many plants and almost every type of
  animal
• Pseudocoelomate false body cavity
• Straight-through digestive tract with 2 openings

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Form and Function

• Body Plan Pseudocoelom
• Three layers Epidermal (cuticle) layer, muscle
  layer and gut cavity
• The pseudocoel is fluid-filled and holds
  reproductive organs

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Form and Function

• Epidermis thick cuticle layer for protection
• Hydrostatic skeleton a fluid-filled, pressurized
  cavity surrounded by muscle

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Digestion

• Digestive System Consists of a mouth, pharynx
  (throat), an intestine, a rectum and an anus
• One way straight path

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Circulation and Respiration

• Circulation No circulatory system Cells
  circulate nutrients and gases
• Respiration Gas exchange occurs through
  diffusion through cuticle
• Sensory organs 2 nerve cords (ventral and dorsal)

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Movement

• Movement move by muscle contractions and cilia
  (tiny hairs)

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Reproduction

• Most are dioecious
• Fertilization is internal
• Males have a spicule to grab on to the female
  while mating
• Shelled fertilized eggs are stored in the uterus
  until they can be deposited in the soil
• One female can lay up to 200,000 eggs in one day

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Life Cycle Stages

• 4 juvenile stages with molting occurring between
  stages
• Some stages require an intermediate host

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Class Secernentea Roundworms

• Most common worm parasite in humans
• Live in Tropical areas with poor sanitation
• Eggs can survive for years in soil (unhatched)
• Contracted by eating vegetables from infected
  soil
• Lives in the intestines of the host but can
  migrate to the heart, lungs or brain
• roundworm parasite in toddler

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Class Secernentea Hookworms

• Transmitted through the soil
• Either ingested or can burrow through the skin
• Attach to the intestinal wall and suck more blood
  than they need
• Can lead to high amounts of blood loss
• parasite from cat scratch

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Pinworms

• The most common parasite in the U.S.
• Contracted through ingestion or anally
• Adults live in large intestine
• Live in intestines but migrate to the anus at
  night to lay their eggs

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Filarial Worms

• Most common is the heartworm in dogs
• Enters tissues and causes immense swelling
  (elephantitis)
• Transmitted into blood stream through mosquitoes

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Class Adenophorea Trichinella Worm

• Cause the potentially lethal disease trichinosis
• They are found in almost any body tissue
• Transmitted by eating uncooked pork or other
  infested meat
• Infect a wide range of mammals
• trichinosis
• monsters inside me

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