Okenia nakamotoensis - feeding observations

December 22, 2004
From: Marina Poddubetskaia

Dear Bill,
To complete my previous message [message #11504], here are the photos of Okenia nakamotoensis feeding on its bryozoan. In upper right nd lower left photos the bryozoan is clearly Tropidozoum cellariiforme, as identified in the book I mentioned [Gosliner, Behrens, & Williams]. As for the lower right photo, the bryozoan seems very different in colour and I'm not sure if it is the same species.

Upper Right: November 05, 2003
Location : M'Sapere, Mayotte Island, France, Indian Ocean
Site : Bouzi, Depth : 7 m, Size : 8-10 mm
Lower left: November 07, 2003
Location : Handrema, Mayotte Island, France, Indian Ocean
Site : Prevoyante, Depth : 15 m, Size : 8 mm
Lower right: November 12, 2003
Location : Kongou, Mayotte Island, France, Indian Ocean
Site : Recif de Peitro, Depth : 11 m, Size : 10 mm

  • Gosliner, T.M., Behrens, D. & Williams, G. (1996) Coral Reef Animals of the Indo-Pacific. Sea Challengers, Monterey, California, 314 pp, 1103 pls.

Cheers,
Marina.

nembro@nembro.info

Poddubetskaia, M., 2004 (Dec 22) Okenia nakamotoensis - feeding observations. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/11505

Dear Marina,
Thanks for these photos. It certainly looks like Tropidozoum cellariiforme, but I suspect bryozoan experts would need to look at a specimen before they would confirm the identification I think the lack of red in the lower right photo is either a sign the branch is dying or covered with something else. You'll see patches without red in the other photos as well. I just included a close-up of your third photo because is shows the bryozoan zoooids [upper left corner] very well.
Best wishes,
Bill Rudman

Rudman, W.B., 2004 (Dec 22). Comment on Okenia nakamotoensis - feeding observations by Marina Poddubetskaia. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/11505

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