inner wall with annuli

knowledge base : exist
structure : number of wall ; inner wall
Number of walls : 2
Structure of outer carcass wall (OW/SW) : isn't included in the term
Structure of inner carcass wall (IW) : Carcass wall well defined
Stipules : isn't included in the term
Carcass perforations: inner wall (IW) : isn't included in the term
Carcass external plates: inner carcass wall (IW) : Present
Type of carcass external plates (IW) : Annuli
Relationship between carcass annuli and tabulae (IW) : isn't included in the term
Shape of carcass external plates (IW) : isn't included in the term
Direction of carcass external plates (IW) : isn't included in the term
Type of morphological tubes (IW) : isn't included in the term
Additional sheath : isn't included in the term