Central Cavity (or internal if one wall) - Archaeocyathan knowledge base (Cambrian)

Descriptor : Central Cavity (or internal if one wall)

Central cavity: Inner space delimited by the inner wall of two-walled cup. In one-walled cup = inner cavity.

Empty: Empty: Without any skeletal structure in the central cavity or in the inner cavity.

Empty
Reduce: Reduce: Due to the large development of the inner wall.

Inner wall: Internal part of the skeleton, separating central cavity and skeletal structures, composed by a porous carcass, simple or coated by an additional sheath.
Full: Full: With secondary skeletal structures in central cavity or in inner cavity.

Full