< Dichotomous Key 
 
      | Dichotomous Key: Chordata | ||
|---|---|---|
| 
 | 
1
- Adults sessile
- Yes - Ascidiacea
- No - #2
 
2
- Animal surrounded by protein and cellulose and a complicated arrangement of filters
- Yes - Larvacea
- No - Thaliacea
 
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