Schepman, 1913 Benthomangelia trophonoidea is a species of sea snail, a marine gastropod mollusk in the family Mangeliidae.

(Original description) The thin, white shell has a fusiform shape, with a moderately long siphonal canal.

The sculpture consists of narrow, oblique ribs, ending at the excavation with small, slightly pointed tubercles.

The excavation is nearly smooth, but with short plicae on a faint subsutural rib, more conspicuous on upper whorls.disappearing on the body whorl and curved growth lines.

The columellar side nearly straight, slightly concave above, a little directed to the left, along the siphonal canal, with a thin layer of enamel, not quite concealing the lirae of surface.