Sicyonia ingentis

Sicyonia ingentis is a species of prawn in the family Sicyoniidae known by the common name ridgeback prawn. It is native to the eastern Pacific Ocean, where it occurs along the coast of California and Baja California, its distribution extending from Monterey Bay to Isla María Madre off Nayarit. It also lives in the Gulf of California. Other common names include Pacific rock shrimp and Japanese shrimp. In Spanish it is called camarón de piedra del Pacífico and cacahuete.

This is a dominant invertebrate in the ocean off Southern California, especially off Los Angeles and Orange counties at depths of 59 to 65 meters (194 to 213 ft). There is a large population on the Palos Verdes Shelf.