Descriptor : Structure of outer carcass wall (OW/SW)

Descriptor type : categorical

Outer wall: External part of the skeleton, composed by a porous carcass, simple or coated by a additional sheath.

Single wall: External part of the skeleton for one-walled cup, composed by a porous carcass, simple or coated by a additional sheath.

Carcass: part of wall on intervallum side.

Carcass wall well defined

Carcass wall not well defined

Carcass wall not well defined: syn. Rudimentary perforate wall.

isn't included in the term

Hierarchy

Number of walls
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 |_ Structure of outer carcass wall (OW/SW)