Trivia or allied cowries number around 100 species, and occur in the same areas as Cypraeidae but also there are species that inhabit colder water areas. Smaller than Cypraea, ranging in size from a few millimeters to about 30 mm, they are characterized by their egg-shaped or globular shells with thickened ridges, a narrow aperture, and a color pattern that is often white, beige, reddish, or brown, sometimes with spots on the dorsum and a whitish base.