West coast of North America from the Gulf of Alaska south to Panama.
Channel Islands, California, USA, 1987. On dark sand at a depth of about 12 meters. Photos: Scott Johnson
Grows to 70mm. Like most species of Armina, it lives in sand or muddy regions and feeds on sea pens, in particular Ptilosarcus gurneyi and Renilla koellikeri. It stays buried during the day, only coming to the surface to feed at night. It causes a spectacular light show when it is feeding on the sea pen Renilla koellikeri because that species produces luminescent flashes every time it is bitten.
• Bertsch, H (1968) Effect of feeding by Armina californica on the bioluminescence of Renilla koellikeri. The Veliger, 10(4): 440-441.
• Cooper, J. G. 1863. Some new genera and species of California Mollusca. Proceedings of the California Academy of Natural Sciences, 2: 202-207.
• MacFarland, F. M. 1966. Studies of opisthobranchiate mollusks of the Pacific coast of North America. Memoirs of the California Academy of Sciences, 6: 1-546, pls. 1-72.
Rudman, W.B., 2002 (October 28) Armina californica (Cooper, 1863). [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet/armicali
Re: Armina californica - feeding
From: Betty Bastai, June 2, 2010
Armina californica and the sea pansy Renilla
From: Kevin Lee, March 17, 2010
From: Jan Kocian, March 9, 2010
Armina californica eggs
From: Jan Kocian, November 6, 2007
Armina californica - feeding
From: Jan Kocian, September 26, 2007
Armina californica feeding, eye spots
From: Mike Neubig, May 29, 2006
Re: Sea Pens and Armina
From: Jan Kocian, October 7, 2005
Armina californica Last Supper?
From: Jan Kocian, October 5, 2005
Juvenile Armina californica feeding
From: Paul Sim, June 14, 2005
Armina californica from Vancouver Island
From: David Roberts, July 9, 2004
Armina californica from Monterey, CA
From: Clinton Bauder, February 17, 2004
Re: Striped Nudibranch from California
From: Scott Johnson, November 1, 2002
Striped Nudibranch from California
From: Natasha Hopkins, October 29, 2002