OW planar annuli

knowledge base : exist
structure : outer wall
Carcass perforations: outer wall or single wall (OW/SW) : isn't included in the term
Carcass bumps: outer wall or single wall (OW/SW) : None
Carcass external plates: outer wall or single wall (OW/SW) : Present
Type of carcass external plates (OW/SW) : Annuli
Shape of carcass external plates (OW/SW) : Planar
Direction of carcass external plates (OW/SW) : isn't included in the term
Stipules : isn't included in the term
Type of morphological tubes (OW/SW) : isn't included in the term
Additional sheath : isn't included in the term