Pteropurpura festiva

Pteropurpura festiva, common name the festive murex, is a species of predatory sea snail, a marine gastropod mollusk in the family Muricidae, the rock snails. Native to the Eastern Pacific, these sea snails grow to 34-67 mm in length.

This species was previously known as Murex festivus. Because the shell of this sea snail is attractive, and is common in San Diego, the name The Festivus was used for the San Diego Shell Club publication, which was started in 1970, became a science journal on malacology, and as of 2011 had been published for over 40 years.