Chelidonura amoena - colour variation

February 21, 2002
From: Nishina Masayoshi


Dear Bill,
I have been looking at an old message where you have identified this species as Chelidonura cf. amoena. I think it is a color form of C. amoena. C. amoena is common in Hachijo Is, Japan. Attached are some interesting photos of C. amoena mating. April to early July is their mating season in Hachijo Is. Water temp is around
18C degree to 20C in the period.

Data:
Date:1 5 April, 2001
Location: Hachijo Island Japan
Depth: 6m
Length: 40mm to 50mm

Best Regards,
Nishina Masayoshi
http://umiushi.zive.net/index.html

nishina@wips.co.jp

Masayoshi, N., 2002 (Feb 21) Chelidonura amoena - colour variation. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/6161

Dear Nishina,
Your animals are not actually mating but they are indeed 'interested' in each other. In the aglajids, the penis is on the right anterior corner of the head while the female genital opening is way back in the small reduced mantle cavity at the posterior end of the body. When thet mate, aglajids usually get together head to 'tail' with the one acting as the male being behind the one acting as a female. Like Sea Hares they can form mating chains of 3 or more animals.

I agree with your suggestion that Lindsay Warren's specimens are a colour form of C. amoena.
Best wishes,
Bill Rudman

Rudman, W.B., 2002 (Feb 21). Comment on Chelidonura amoena - colour variation by Nishina Masayoshi. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/6161

Factsheet

Chelidonura amoena

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