brachial

Pertaining or belonging to the arm.

Of the nature of an arm.

Denoting the upper valve of a brachiopod's shell

The first brachials are somewhat broader than long and are not entirely in contact interiorly. The second brachials are squarish. The first and most of the second brachials bear spines […]

Cup conical, weakly developed basal flange, six arms per ray, one exotomous branching, all brachials biserial within two to five brachials of branching, cup ornamentation probably striae radiating from base of arms onto basals.