Descriptor : Direction of carcass bumps perforation (OW/SW)

Descriptor type : categorical

Bumps: Outer wall structure in shape of a subspherical/hemispherical dome.
Similar: Tumuli, pustule.

Carcass: Part of wall on intervallum side.

OW: Outer wall.

SW: Single wall.

Downwardly opening

Tumulus (plur. tumuli): Outer wall structure in shape of a subspherical dome covering an individual and downwardly projected wall opening.

Central opening

Pustula (plur. pustulae): Wall structure covering an individual pore and pierced by a single central orifice.

NB: Pustulae resemble simple tumuli.

isn't included in the term

Hierarchy

Perforation of carcass bumps (OW/SW)
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 |_ Direction of carcass bumps perforation (OW/SW)