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10 Cards in this Set
- Front
- Back
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What organisms are in the class Ascidea?
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Sea squirts
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Describe the body of Ascidea.
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Sac-like, tough tunic-like outer body.
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How do Ascideans feed?
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filter feed.
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What are the four classes of Urochordata?
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Ascideans, Thaliaceans, Larvaceans, Sorberaceans.
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Describe the metamorphosis that happens between larva and adult in Ascideans.
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Larva are mobile and adults are sessile. larva has gill slits, postcaudal tail, extra part of their brain for locomotion, notochord. Adult has endostyle and single ganglion
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Describe Thailacieans.
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Filter feeders with barrel-like bodies. Have respiratory apparatuses with oral siphon and atrial sipphon.
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Describe the class Larvacea
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neotenic, retains notochord and postanal tail. Has opening for water to go through, not gill slits. Solitary creatures.
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What is the scientific term for lancelets?
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amphioxus, branchiostoma.
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What do lancelets have in common with vertebre?
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postanal tail, gill slits, and hollow nerve chord.
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What differentiates the lancelet from other vertebre?
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poorly developed tail, worm-like, and no fins. No jaw, no eyes. No vertebre, only a notochord. notochord extends into spine. Do not possess true brain.
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