OW downwardly projecting canals

knowledge base : exist
structure : outer wall
Carcass perforations: outer wall or single wall (OW/SW) : Canals
Shape of carcass canals (OW/SW) : isn't included in the term
Direction of carcass canals (OW/SW) : Downwardly opening
Origin of carcass canals (OW/SW) : isn't included in the term
Relationship between carcass canals and intersept (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) : 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