Laguna Beach, Orange County, CA. 08/10/06. © Peter J. Bryant

Spirorbis

Spirorbis sp.

Polychaeta: Spirorbidae

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Laguna Beach, Orange County, CA. 08/10/06. © Peter J. Bryant

Laguna Beach, Orange County, CA. 08/10/06. © Peter J. Bryant

Individual D08. Off Lido Island, Newport Beach, Orange County, CA. 3/22/14. © Peter J. Bryant . Video

Juvenile: the shell and the operculum have developed but the individual pinnules of the radioles are not fully grown. Off Balboa Island at Coral, Newport Beach, Orange County, CA. 8/5/14. © Peter J. Bryant . Video
In the pictures below, the animal (probably a different, more loosely coiled species than above) is carrying embryos in its operculum.

Laguna Beach, Orange County, CA. 08/20/06.

Laguna Beach, Orange County, CA. 08/20/06.