Descriptor : Shape of carcass canals zone A (IW)

Descriptor type : categorical

NB: Look tube shape not opening shape.

Zone A: Intervallum side.

Canal: Pore modified by skeletal structure thikening or by lintels streching. Canal length is greater than perforation diameter.

Lintel: Skeletal structure separating and bounding adjacent pores.

Carcass: Part of wall on intervallum side.

IW: Inner wall.

Straight

Waved

S-shaped

S-shaped: Resembles S in longitudinal section.

V-shaped

V-shaped: Resembles V in longitudinal section.

Inverted V-shaped

Inverted V-shaped: Resembles A in longitudinal section.

isn't included in the term

Hierarchy

Carcass perforations: inner wall (IW)
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 |_ Shape of carcass canals zone A (IW)