Chelidonura amoena - shape and colour variation

July 2, 2003
From: Atsushi Ono


Dear Bill,
Thank you for your comment on my "yellow spotted Chelidonura." Here are some photos showing variation in Chelidonura amoena, including some with "short tails" ones. In a separate message I have sent a photo of a 'short-tailed' C. pallida.

017 - has long tails, dark form.
018 - has short tails, about 40 mm long.
019 - has very short tails, about 50 mm long.
020 - has very few white dots on body and short tails.
021 - has half long tails.

I think the attached are all C. amoena. All are from Kerama Is., Okinawa Japan.

Sincerely,
Atsushi Ono

ononini@cosmos.ne.jp

Ono. A., 2003 (Jul 2) Chelidonura amoena - shape and colour variation. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/10200

Thanks Atsushi,
You certainly have shown us that specimens of Chelidonura can lack their characteristic 'tails'. I guess its the result of either a mistake during larval development or physical damage during the life of the slug. Concerning the identity of these animals, while 18, 19, 21 seem to be C. amoena, the other two [17, 20] look rather different. They are probably the same as Lindsay Warren's photos which I kept separate as Chelidonura cf. amoena. However Nishina's photos suggests they are indeed just a form of C. amoena. We still seem to have a lot to learn about these animals

Best wishes,
Bill Rudman

Rudman, W.B., 2003 (Jul 2). Comment on Chelidonura amoena - shape and colour variation by Atsushi Ono. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/10200

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Chelidonura amoena

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