Ridged Slipper Limpet Shell, Crepidula striolata

Ridged Slipper Limpet Shell, Crepidula striolata. Shell collected off the beach in Cabo San Lucas, Baja California Sur, August 2020. Size: 4.3 cm (1.7 inches) x 2.8 cm (1.2 inches).

The Ridged Slipper Limpet, Crepidula striolata (Menke, 1851), is a gastropod mollusk that is a member of the Calyptraeidae Family of Cup-and-Saucer and Slipper Limpets. The  shells have an oval profile with a fairly low apex, a large shelf and covers about one half the shells interior and the exterior has a smooth texture however a small number of the shells are sculpted with low radial ribs. The exterior of the shells are white in color; some individuals have brown around the apex or on the ribs; the interior shiny white. Live shells have a yellow brown periostracum. The Ridged Slipper Limpet Shell reach a maximum of 5.0 cm (2.0 inches) in length and 3.3 cm (1.3 inches) in height.

The Ridged Slipper Limpet are found on and under rocks, and on of larger sea shells in the intertidal zone to only a few feet of water. They are found throughout the Sea of Cortez and extend as far south as to Peru, including the Galapagos Islands.

Synonyms include Calyptraea squama, Crepidula squama, and Crepidula strigatella.