Re: A juvenile Oxynoe viridis ? from nthn Mariana Islands

July 28, 2008
From: Takao Urasawa

Concerning message #4946:

Dear Dr.Bill,
Here are two pictures. We haven't as yet seen a juvenile Oxynoe viridis.
The point we took these photos has a rapid current.

Locality: Flemming, 10 m, Tinian, Northern Mariana Islands, Pacific Ocean, 16 April 2008, on the Caulerpaceae before drop-off. Length: 6 mm. Photographer: Takao Urasawa.

Would you tell us your idea, please ?
Best regards,
Ura

ds-with@isletwind.com

Takao Urasawa, 2008 (Jul 28) Re: A juvenile Oxynoe viridis ? from nthn Mariana Islands. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/21590

Dear Ura,

This is definitely a species of Oxynoe and it's possible the dark spots we can see become blue, as in O. viridis, as it grows. But we still have much to learn about these animals so it is important to get to know your local populations. For example, if this is a juvenile O. viridis then you would be likely to find adult O. viridis on this species of Caulerpa as well.  If not, then perhaps there is another species of Oxynoe that is found on it?

Because they are so well camouflaged on their algal food, it is sometimes quite difficult to find more than one or two specimens of Oxynoe at any time, and even harder to find small juveniles, but I am afraid the only way to link juveniles and adults (other than breeding them in aquaria) is try and find them living together on the same algae and to try and find growth stages linking them all together.

Best wishes,
Bill Rudman

Rudman, W.B., 2008 (Jul 28). Comment on Re: A juvenile Oxynoe viridis ? from nthn Mariana Islands by Takao Urasawa. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/21590

Factsheet

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