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13 Cards in this Set
- Front
- Back
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What example from lab comes from the phylum platyhelminthes? |
Planarians (digesia) |
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Where are platyhelminthes found? |
Under rocks, leaves, and debris in freshwater ponds and creeks. |
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What type of symmetry does a planarian have? |
Bilateral, it is a new feature compared to phylum porifera |
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How does the planarian feed? |
By extending a long tubular pharynx out of the mouth, a circular opening on the ventral side of the body |
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What type of body cavity does a planarian have? |
Acoelomate |
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How many openings are there to the planarian digestive tract? |
One (mouth/pharynx) |
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What does the digestive system of a planarian consist of? |
Mouth, pharynx (which lies in a pharyngeal chamber), and a branched intestine. |
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What did we feed the planarian in lab? |
Sheep's blood. |
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What does the nervous system in the planarian consist of? |
Auricles which contain a variety of sensor cells, eyespots which are photosensitive, cerebral ganglia which serves as the brain, and two ventral nerve cords connected by a ladder like nervous system |
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How many tissue layers are present in the planarian? |
Three (tripoblastic) Fun fact: flatworms are the first hope of animals to have three well-defined embryonic tissue layers |
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How was the planarian body supported? |
Hydrostatic skeleton |
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How was the planarian body supported? |
Hydrostatic skeleton |
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What does the excretory system consist of in the planarian? |
Two lateral excretory canals and "flame cells" that move fluid through the canals |
