Passively and actively filled

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Does the complex burrow with the boxwork-morphology and both passively and actively filled sections have a wall-lining or mantle? Please, choose accordingly:

  1. With lining/mantle
  2. Without lining/mantle
  3. Both, with and without lining

Take me to the ichnology start page!

Take me back to the beginning of the determination key!

Take me to the alphabetical list of ichnogenera!

[Passively and actively filled]