Jenner’s Cowry Shell, Jenneria pustulata: Jenner’s Cowry Shell is very easy to identify and cannot be confused with any other shell due to the bright orange pustules, each of which is encircled by a dark-colored ring covering the glistening gray surface with fine spiral lines.
On the base the apertural teeth extend to the margins as white ridges on a dark brown background.
They reach a maximum size of 2.5 cm (1.0 inch) and 1.5 cm (0.6 inches) in width.
In Mexican waters Jenner’s Cowry is found throughout the Sea of Cortez and along the coast of the mainland south to Guatemala. This shell is of significant commercial interest being sold extensively by shell collectors.
Jenner’s Cowry Shell is a member of the Pediculariidae Family, which has approximately 20 current members, and consists of small to large predatory and parasitic sea snails and which includes the cowries. They are dark colored shells with finely striate surface markings with the dorsum studded with nodes.
They have strong shells that can resist crushing by crabs, their predator. Most are nighttime carnivorous scavenging carnivores that feed on ascidians, crustaceans, mollusks and worms. They are found in and around masses of stony coral.