Spindle Trivia Shell, Trivia fusca: The Spindle Trivia Shell is a small brown ovate shell with blunt ends that has small ribs that are close together and several do not continue over the edges to the lips beneath.
Compared with other similar Trivia Shells the ribbing is more numerous and smooth.
Spindle Trivia Shells are found in and around the low-tide line under rocks. They reach a maximum size of 1.0 cm (0.4 inches) and 0.7 cm (0.3 inches) in width.
In Mexican waters the Spindle Triva Shell is found around the tip of Baja and along the coast of the mainland south to Guatemala. This is a very rare shell and in demand by shell collectors.
The Spindle Trivia is a member of the Triviidae Family, which are the Trivia Shells, a very large global family with several hundred members. They are generally small and globose to ovate in shape and the aperture runs the length of the shell.
They have teeth along the margins of the aperture and the shells are strongly sculptured with well developed spiral ribbing. They have strong shells that can resist crushing by crabs, their predator.
Most are nighttime carnivorous scavenging carnivores that feed on ascidians, crustaceans, molluscs and worms.