Derico

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Across
  1. 2. third level of classification
  2. 3. first level of classification
  3. 5. to put in group
  4. 7. flat thin body
  5. 8. seventh level of classification
  6. 10. sixth level of classification
  7. 11. no back bone
  8. 14. second level of classification
  9. 15. hollow body
Down
  1. 1. grouped
  2. 4. fourth level of classification
  3. 6. has a backbone
  4. 9. fifth level of classification
  5. 12. moist skin
  6. 13. have wings