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Description
Flashcards by Nina Weiland, updated 10 months ago
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Created by Nina Weiland
10 months ago
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| Question | Answer |
| Cuticle | Tough, flexible exoskeleton. Provides protection from water loss, predators, and the environment |
| Molting | Periodic shedding of old exoskeleton. Old cuticle is replaced my a new cuticle |
| Nematoda | Roundworms Triploblastic (endoderm, mesoderm, ectoderm) Bilateral Symmetry Pseudocoelomates |
| Muscles attach... | Longitudinally (rings are NOT true segmentation) |
| The Nervous System Contains... | 4 longitudinal nerve cords Pharyngeal nerve ring (fused at anterior end) "Brain" |
| Parasitic Nematodes | Complex lifecycles with multiple hosts significant Vet and Medical impacts |
| Parthenogenesis | reproduction from an ovum without fertilization |
| Guinea Worms | Infection from drinking unclean water Contains copepods - intermediate crustacean host |
| Hook Worms | Infect Intestines Feed on Mammalian blood |
| Trichinella | Trichinosis in mammals Resolves in 3 months Infection from undercooked pork |
| Filarial Worms | Vector: Mosquitos Obstruction of lymph drainage Elephantiasis |
| Tardigrades | Live in marine, freshwater, or damp terrestrial environments "Water bears" Chitinous cuticle Cryptobiosis |
| Cryptobiosis | State that protects the organisms from desiccation, low temperatures, vacuum, high pressures, and radiation |
| Circular Mouth (Tardigrades) | Feed on algae, plants, and small animals |
| Tardigrade Morphology | Cylindrical bodies 4 legs with claws cuticle periodically molted 3 "front" legs used for walking circular mouth Brain connected to nerve cord w/ segmented ganglia at appendages simple eyespots on head |
| Tardigrade Reproduction | Most species that 2 sexes mating at time of molt external fertilization eggs deposited in old cuticle |
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