NEMATODA

Subdecks (1)

Cards (23)

  • Nematoda is also known as roundworms
  • nematoda's body are bilaterally symmetrical
  • nematoda's are cylindrical in shape
  • nematoda have complete digestive system
  • nematoda's body is covered by collagenous (protein) cuticle
  • nematoda's are free-living or parasitic
  • nematoda's body are Pseudocoelomate and triploblastic
  • pseudocoelomate means that the body cavity is not completely enclosed by a membrane
  • triploblastic means that the embryo has three layers of cells
  • Nervous System of nematoda: Consist of a ring of nerve tissue (nerve ring) around the pharynx and one or more nerve cords running along the length of the body.
  • 1/2 Sensory structure of nematoda:
    Amphids
    ✓ Located near the anterior end of the body.
    ✓ Involved in chemoreception and mechanoreception
    ✓ Allows to detect and respond to changes in their environment.
  • 2/2 Sensory structure of nematoda:
    Phasmids
    ✓ Located near the posterior end of the nematode's body.
    ✓ Associated with chemosensation
    ✓ Allows to detect environmental cues, including potential mates, food sources, and predators.
  • 1/2 Digestive and Excretory Organs:
    Stylet
    ✓ A piercing mouthpart some plant-parasitic nematodes.
    ✓ Used to puncture plant cells and extract nutrients from the host tissues.
    ✓ It is a specialized structure that enables these nematodes to feed on plant sap.
  • 2/2 Digestive and Excretory Organs:
    Excretory ducts and glands
    ✓ Helps regulate the nematode's internal fluid balance and remove metabolic wastes from the body.
  • Reproductive organs
    Spicules
    ✓ A paired copulatory structures of male nematodes.
    Spicules are inserted into the female's reproductive tract during mating and aid in the transfer of sperm.
    ✓ The size, shape, and structure of spicules vary among different nematode species.
  • Muscular Layer:
    ❑ Nematodes have longitudinal muscles that run along the length of their bodies.
    ❑ These muscles allow nematodes to move by contracting and relaxing in a wave-like motion.
  • Sexual Reproduction (Internal Fertilization)
    • Roundworms reproduce sexually.
    • They are dioecious
  • dioecious means having male and female parts on separate animals of the same species