Larvacea
<tr><th bgcolor=pink>Scientific classification
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<tr><td>Kingdom:<td>Animalia
<tr><td>Phylum:<td>Chordata
<tr><td>Subphylum:<td>Urochordata
<tr><td>Class:<td>Larvacea
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<tr><th bgcolor=pink>Orders
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Larvacea, also called appendicularians, are urochordates which retain the larval form into adulthood. They are small planktonic filter feeders, and regularly build a "house" which gets bigger until they cast it off and build a new one. They look like tadpoles with the head mounted at right angles to the tail, which retains the notochord.
