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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 ' and '.
This is a dominant invertebrate in the ocean off Southern California, especially off Los Angeles and Orange counties at depths of . There is a large population on the Palos Verdes Shelf.
==Biology==
Measured from the bases of the antennae to the telson, the male prawn reaches a maximum length around , and the female . It is the largest ''Sicyonia'' in the eastern Pacific.〔 It is mostly reddish brown in color with more red on the underside. The legs are whitish with red patches.〔 It often occurs with ''Sicyonia disdorsalis'', which it resembles, but it is larger and can be distinguished by the setae on its carapace, the spines on its telson, the shape of the genitalia, and other external characteristics.〔
This prawn can be found on substrates of mud and shell debris, but it appears to prefer sand.〔 Spawning takes place in May through October, peaking in late summer. It occurs in water about deep.〔 An ovulating female begins to swim more than usual before releasing her eggs. One spawning yields an average of about 86,000 embryos. The prawn likely spawns multiple times during one season. Molting occurs mostly in fall and winter, rarely during the summer breeding season.〔〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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