Egg ribbon of S. chromosoma ? from Japan.

April 17, 2002
From: Jun Imamoto


Dear Bill.
To accompany my other photos, here are photos of the egg ribbon of Spurilla neapolitana or S. chromosoma from Japan. It seems to be S. neapolitana when it is judged from the egg. Please give me advice.

Date: Nov 2001
Place: Shimoda, Izu Peninsula (Sagami Bay), Japan
Depth: Intertidal (3cm)
Size: 20 - 25mm

Best Regards,
Jun Imamoto

imamoto@wips.co.jp

Imamoto, J., 2002 (Apr 17) Egg ribbon of S. chromosoma ? from Japan.. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/6715

Dear Jun,
Thanks for these interesting photos. Certainly the egg ribbon looks more like Daniel Gieger's photo of Spurilla neapolitana than Bruce Wight's photo of S. chromosoma.

However S. neapolitana from the Mediterranean has branches of the digestive gland ramifying through the body wall, which when full of zooxanthellae, appear as a dark brown network in the skin. I have never seen photos of Japanese animals showing this network. I am not sure which animals identified on the Forum as either species are correctly identified - except for the few from the Mediterranean [S. neapolitana] and California [S. chromosoma].

Although your photos don't solve the problem, they certainly give us something to think about.
Best wishes,
Bill Rudman

Rudman, W.B., 2002 (Apr 17). Comment on Egg ribbon of S. chromosoma ? from Japan. by Jun Imamoto. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/6715

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