L8: Ecdysozoan Phyla Flashcards
Identify features common to Ecdysozoans Describe the structure of the cuticle in nematodes and why it is important Describe the filarial worm life cycle Discuss ecological importance of nematodes
The kingdom Ecdysozoan consists of what kind of animal?
Round worms
What is the triploblastic organizational pattern of nematoda
Pseudocoelomate
Pertaining to nematoda…
T/F: Lack cilia
True
Pertaining to nematoda…
Excretory system contains _ cells
renette cells
Describe the layered, noncellular cuticle of nematodes
Made of chitin or collagen
Has to slough it off as it grows in place for a larger one
Provides resistance and water proofing
Pertaining to nematoda…
Muscles are oriented ____, reducing movements they can make
Longitudinally
Pertaining to nematoda…
T/F: Monoecious
False! Dioecious
Pertaining to nematoda…
How do you tell the difference between a female/male
Males are smaller, with a hook like structure at the end of the tail
Pertaining to nematoda…
Describe the purpose of the Renette cells/glands
Materials from the pseudocoelom enter, and the renette glands secrete either dilute or concentrated urine (environment-dependent) and nitrogenous waste
Pertaining to nematoda…
Describe the tubular system in parasitic nematoda
Long ducts on either side of animal emersed in pseudocoelomic fluid. Excretes urinary product
Why are nematodes so important?
- Enormous diversity and abundance.
- Perform many roles: decomposers, predators, parasites
- Present everywhere (soil, water, ice, plants, digestive tracts)
- Regulate soil bacteria and fungal populations - associated with nutrient cycling
