Shape of carcass external plates (IW) - From a traditional terminology to an adapted one

Descriptor : Shape of carcass external plates (IW)

External plates: Plate covering incompletely one or several perforations of a wall.

Carcass: Part of wall on intervallum side.

IW: Inner wall.

Planar
Arcuate
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.
Fused: Fused: Adjacent bracts or scales of the same horizontal file are incompletely amalgamated to form a single structure covering two or more perforations of a wall.
Cone in cone
Denticulate: Denticulate: With indented rims.
isn't included in the term

Carcass external plates: inner carcass wall (IW)
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 |_ Shape of carcass external plates (IW)