MODULE Nematodes Flashcards
What is the phylum of nematodes?
Nematodes belong to the phylum Nemathelminthes.
What class do nematodes belong to?
Nematodes belong to the class Nematoda (Roundworms).
What are the general characteristics of nematodes?
-Nematodes are free-living or parasitic, -usually have separate sexes,
-may have direct or indirect life cycles, -are unsegmented,
-have a present alimentary canal, and possess a
-body cavity filled with fluid.
What is the general morphology of nematodes?
Nematodes have an elongated, cylindrical shape tapering at the extremities, except for Tetrameres and Simondsia.
What covers the body of nematodes?
The body of nematodes is covered by a cuticle, which is generally smooth but may have annulations and striations.
What are some modifications of the cuticle in nematodes?
Modifications include leaf crowns, cervical or caudal papillae, cervical and caudal alae, and copulatory bursa.
What are leaf crowns in nematodes?
Leaf crowns are rows of papillae around the rim of the buccal capsule, prominent in horse nematodes, possibly used to pin mucosa during feeding or prevent foreign matter entry.
What are cervical or caudal papillae?
Cervical or caudal papillae are spine-like or finger-like processes that serve sensory or supportive functions.
What are cervical and caudal alae?
Cervical and caudal alae are flattened, wing-like expansions of the cuticle in the esophagus and tail region, not present in Ascaris lumbricoides.
What is the copulatory bursa?
The copulatory bursa is a structure that embraces the female during copulation, highly developed in strongylids, derived from expanded caudal alae.
the cuticle may form special adhesive structures like
(Tetrameres, Rictularia),
