Re: Cuthona? from East Timor is Antonietta

April 13, 2006
From: Jun Imamoto

Concerning message #16267:

Dear Bill,
Thank you for your advice.

Concerning your question "Are they photographed on a rock or is it a large shell?"

In those photos they were fastened to a rock, but sometimes they grow on snail shells as well. Here are some photos of  Hydractinia epiconcha growing on the shell of a living snail.

Locality: Shimoda, Izu Peninsula, Sagami Bay, 0.5m, Japan, Pacific Ocean, 15 December 2001, Intertidal. Length: 12mm. Photographer: Jun Imamoto.

Best wishes,
Jun Imamoto
http://www.umiushi.info/

imamoto@umiushi.info

Imamoto, J., 2006 (Apr 13) Re: Cuthona? from East Timor is Antonietta. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/16302

Dear Jun,
Thanks for these photos. I mentioned the very similar European Hydractinia echinata in my comments on your earlier message. It is interesting that H. echinata is eaten by Cuthona nana, and on the west coast of Nth America another Hydractinia is eaten by Cuthona divae, both aeolids from a completely different family from A. janthina. I have searched many Nassarius snails with Hydractinia growing on their shells here in Australia, but have yet to find any aeolid interested in them as food.
Best wishes,
Bill Rudman

Rudman, W.B., 2006 (Apr 13). Comment on Re: Cuthona? from East Timor is Antonietta by Jun Imamoto. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/16302

Factsheet

Antonietta janthina

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