Shell is slender, with two strong ribs per whorl (bicarinate), which are often noded (regular small bumps). Growth lines are often visible on later whorls.

Size: 60-80 mm.

Ecology: inhabits shallow-offshore marine (10-100 m) waters, burrowing in silt near sediment surface; filter-feeding.

Geological range: Early Miocene-Late Pliocene (20-3 million years ago).

Geographic distribution: Caribbean – Panama, Brazil, Colombia, Costa Rica, Dominican Republic, Grenada, Puerto Rico, Trinidad, and Venezuela; Pacific – Panama, Colombia, Ecuador, and Mexico.