Polychaete: Family Chaetopteridae, probably Spiochaetopterus sp. A. The smooth soft nature of the 2 tentacles & the clear, annulated "parchment" (actually solidified mucus) tube are the key features. It used to be identified as Spiochaetopterus costarum which was described from the Gulf of Naples. The Lamb & Hanby book probably have it as S. costarum. Years ago I took a close look at the anatomy of our local animal & compared it to good descriptions of European material. It was clear that our wee beastie was not the same thing. Since then I've called it sp. A.
ID and explanation thanks to Leslie Harris
Catalina Island, California USA

Polychaete: Family Chaetopteridae, probably Spiochaetopterus sp. A. The smooth soft nature of the 2 tentacles & the clear, annulated "parchment" (actually solidified mucus) tube are the key features. It used to be identified as Spiochaetopterus costarum which was described from the Gulf of Naples. The Lamb & Hanby book probably have it as S. costarum. Years ago I took a close look at the anatomy of our local animal & compared it to good descriptions of European material. It was clear that our wee beastie was not the same thing. Since then I've called it sp. A.
ID and explanation thanks to Leslie Harris
Catalina Island, California USA