Rudman & Johnson, 1985
At present known only from the Enewetak Atoll, Marshall Islands.
Enewetak Atoll, Marshall Islands, 10mm long alive, August, 1981. PHOTO: Scott Johnson
The body is elongate with a relatively narrow mantle margin. The anterior edge of the mantle is held horizontally while the sides fold down giving the animal a spatulate appearance. The mantle is purplish white with a broad orange band abound the edge, the inner half of the band appearing more opaque. On the inside edge of the orange border is an irregular line of red, usually thin but widening in places to give the appearance of a row of red spots.
The rhinophore stalks are transparent and the club has a whitish core, the lamellae being red. The seven gills are simply pinnate, coloured watery red, more opaque at the edges. They wave rhythmically and are arranged in a circle around the anus. The foot is pale purple, deepening posteriorly and on the oral tentacles. The posterior end of the foot extends beyond the end of the mantle when the animal is crawling.
• Rudman, W.B. (1985) The Chromodorididae (Opisthobranchia: Mollusca) of the Indo-West Pacific: Chromodoris aureomarginata, C. verrieri and C. fidelis colour groups. Zoological Journal of the Linnean Society 83: 241-299.
Rudman, W.B., 1998 (November 11) Thorunna purpuropedis Rudman & Johnson, 1985. [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/thorpurp
February 19, 2004
From: Kunihiro Takahashi
Date: 26 May, 2001
Location: Cape Maeda,Okinawa Japan
W/Temp: 25C degree
Photo by Kunihiro Takahashi
email@example.comTakahashi, K., 2004 (Feb 19) Thorunna purpuropedis from Okinawa, Japan. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/12248
I am pretty sure this is Thorunna purpuropedis. As I said in answer to your first message, there are quite a few species with very similar colour patterns. It is often necessary to dissect them and look at their anatomy and radular teeth before we can be truly sure we have correctly identified them.
August 5, 2000
From: Bob Bolland
To continue with an earlier thread concerning Thorunna purpuropedis, here's an image from Yukinobu Adachi's Homepage here on Okinawa [http://www.cosmos.ne.jp/~breach](submitted with his permission). This beautiful animal is similar to the one submitted earlier by Atsushi Ono; this one also has a break in the orange border near the rhinophores much the same as in T. montrouzieri. Perhaps this is a constant feature of the species in Okinawan waters, or perhaps a new species? In either case, this is a beautiful animal.
Maeda Point, Okinawa
Just thought I'd add the image to the Forum to illustrate some additional variation.
firstname.lastname@example.orgBolland, R.F., 2000 (Aug 5) Thorunna purpuropedis? from Okinawa. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/2817
Thanks to you and Yukinobu Adachi for the photo. Variations, puzzles, problems are always welcome.
June 15, 2000
From: Atsushi Ono
Thank you for your reply.
I found this at 4m depth on dead coral at Kerama Is. near Okinawa. It was 7mm long, I found only one individual.
Could you help me to identify this?
email@example.comOno, A., 2000 (Jun 15) Thorunna purpuropedis from Kerama Id. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/2578
Thanks for sending this photo. It has helped me realise that I was wrong with the animal you sent on June 9.
Thorunna speciosus does not have any red in its colour pattern and of the other two species with red, in Thorunna montrouzieri the orange border is absent posteriorly, while in Thorunna purpuropedis the orange band continues around the mantle edge.
One feature that is a bit puzzling is the orange border on either side just in front of the rhinophores. In other specimens of T. purpuropedis this continues around the front of the mantle, but in you photo there is a break as in specimens of T. montrouzieri. We will need more specimens and photos to clarify these species.
June 9, 2000
From: Atsushi Ono
It is 13mm long and I found them at 5m depth on a coral reef at Kerama Is. near Okinawa in Japan.
firstname.lastname@example.orgOno, A., 2000 (Jun 9) Thorunna speciosus from Japan. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/2467
This is definitely T. speciosus but I don't think the other two photos you sent are colour variations of this species. Even if the orange border could vary to white, in T. speciosus there is always a break in the band on each side at the front of the mantle alongside the rhinophores. In the other animal, which I have tentatively called Thorunna cf. speciosus, there is no break in the white band bordering the mantle.