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6 Cards in this Set
- Front
- Back
What pseudocoelomate phyla did we examine? What features do they share? Does current taxonomy consider them close relatives? |
Nematoda, rotifera An external cuticle, a complete digestive system, and a pseudocoelom (fluid filled cavity) They are also typically dioecious No, because they both molt their cuticles nematoda is now grouped with arthropoda in ectodysozoa |
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Phylum, g +s What features are diagnostic for this phylum? Where does it live and how does it hunt? Why is it difficult to handle? |
Nemertea Emplectonema gracile A fluid filled rhynchocoel containing a protrusible proboscis. It uses its proboscis and stylet, which injects paralyzing venom, to kill prey in its marine benthic environment They undergo spontaneous fragmentation |
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Phylum What are the three body sections What three anatomical features should you know? What are their functions? What is their ecological role? |
Rotifera Head body and foot Ciliated corona: movement Mastax: grinding food Pedal glands: produce cement for attachment They are important members of freshwater lake zooplankton. They are also very hardy they can undergo parthenogenesis to give rise to resting eggs and undergo anhydrobiosis |
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Phylum, g + s Why is it so big? Lifecycle and hosts |
Nematoda, ascaris lumbricoides Lots of reproductive organs -Eggs containing L1 larvae are ingested by host (human or pig) -Hatch in stomach, L1 penetrates intestine and migrates to lungs -W/in the lungs they molt three times and move to the mouth region where they are swallowed -Adult worms mature in intestine and produce eggs, which get released in host feces |
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Label the unlabeled sections of this diagram What disease does this cause? |
Ascariasis |
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Phylum, genus, species What is this? Life cycle with hosts and the disease it causes |
Nematoda, Trichanella spiralis -L1s are released from adult female in the small intestine of a carnivore -L1s enter blood stream and are carried to skeletal muscle where they hijack a muscle cell to become a nurse cell -When eater by another mammalian host larva emerge from nurse cells and mature in the intestine (L2-> L3 ->L4) The disease in humans is called trichinellosis |