Siphonophore

Agalma elegans

Hydrozoa: Physonectae

Athorybia larva, identified by Richard Kirby and Gill Mapstone. 
Off Dana Point, Orange County, CA. 09/03/15. © Peter J. Bryant

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The first larval bracts are serrated and have a pocket of nematocysts at their distal end, connected by a bracteal canal. Later bracts are not serrated.