Japanese Protaeolidiella atra (without a stripe)

September 23, 2001
From: Yasuhiro Shirai


Dear Bill,
I saw Nishina's message about Protaeolidiella atra on your Forum. I have found Protaeolidiella with and without the white stripe at Kushimoto, Kii Peninsula, central Japan. They are on my website at http://www.sea-slug.com. Here are some of the photos of Protaeolidiella atra, without a white stripe, to add to the ones I sent in an earlier message
This individual is very large and it has very long cerata. I took photo at Mie, Shijima Prefecture, central Japan. P. atra is a common slug in this area, but they don't have white line on their back.

I have also included a photo of their egg ribbons. I have sent photos of the striped animal in a separate message.

Mie, Shijima Prefecture, central Japan, 2 July, 2000.
Length: about 70mm.
Depth: 18m.
Water temperature: 21 degree.

Best wishes,
Yasuhiro Shirai

yasuhiro@e-net.or.jp

Shirai, Y., 2001 (Sep 23) Japanese Protaeolidiella atra (without a stripe). [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/5302

Thanks Yasuhiro,
The egg ribbons are particularly interesting because they look identical to those in my photo at the top of the page which were layed by a white striped animal from Australia. Similarly I don't think the length of the cerata is very important because the length of the cerata is quite variable, perhaps because they are easily autotomised, and so can be in a stage of regrowth.
Best wishes,
Bill Rudman

Rudman, W.B., 2001 (Sep 23). Comment on Japanese Protaeolidiella atra (without a stripe) by Yasuhiro Shirai. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/5302

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Protaeolidiella atra

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