one canal-like opening per intersept longitudinally continuous along the entire cup

knowledge base : exist
structure : inner wall
Stipules : None
Carcass perforations: inner wall (IW) : Vertical tubes
Building of carcass perforations (IW) : isn't included in the term
Carcass external plates: inner carcass wall (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