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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

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?

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

Phylum
What are the three body sections
What three anatomical features should you know? What are their functions?
What is their ecological role?

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



Phylum, g + s
Why is it so big?
Lifecycle and hosts

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

Label the unlabeled sections of this diagram
What disease does this cause?

Label the unlabeled sections of this diagram


What disease does this cause?



Ascariasis

Ascariasis

Phylum, genus, species
What is this?
Life cycle with hosts and the disease it causes

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