Gosliner & Willan, 1991
Wakatobi, Sulawesi, Indonesia, Banda Sea. Depth: 10 metres. Length: 1 inch. 5th September 2005. sandy rubble bay area. Photographer: Candy Armstrong
This species is very similar in shape to Flabellina bicolor, including having long oral tentcles with flattened, paddle-shaped tips. It differs in having a reticulate white pattern on the body, rather than a uniform dusting of white, and a purple band and a yellow band on each ceras, rather than just the yellow or gold band found in Flabellina bicolor.
Gosliner, T. M. & Willan, R. C. (1991) Review of the Flabellinidae (Nudibranchia: Aeolidacea) from the tropical Indo-Pacific, with the descriptions of five new species. The Veliger, 34(2): 97-133.
Rudman, W.B., 1999 (July 1) Flabellina riwo Gosliner & Willan, 1991. [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/flabriwo
December 10, 2009
From: Hugues Flodrops
Her is a Flabellina riwo, which is seldom seen on the fore reef zone.
This species was first found in Riwo Village, near Madang, Papua New Guinea.
We have any pictures of specimen from Le Cap La Houssaye.
Locality: Cap La Houssaye, 12 metres, Reunion Island, Indian Ocean, 17 september 2009. Length: 20 mm. Photographer: Hugues Flodrops.
I hope that information contribute knowing distribution of the species.
email@example.comFlodrops,H., 2009 (Dec 10) Flabellina riwo from Reunion Island. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/22945
Although it was named from a village in Papua New Guinea, Gosliner & Willan (1991) also reported it from Indonesia, Okinawa and northern Madagascar. We also have records on the Forum from Japan, Malaysia and Indonesia, so it is clearly widespread in the Indo-West Pacific.
Your record from Reunion certainly fills in another gap in its recorded distribution, but from the records we now have I thik we can confidently predict it will be found throughout the tropical Indo-West Pacific.
September 10, 2005
From: Wendy Brown
Here is a picture of a nudibranch which I cannot seem to identify and wondered if you might be able to help. I am not even sure which family it is from. It was found in 10 metres of water at Wakatobi, Sulawesi, Indonesia on the 5th September. It was in a sandy rubble area and moving quite rapidly.
Locality: Wakatobi, Sulawesi, Indonesia, Banda Sea. Depth: 10 metres. Length: 1 inch. 5th September 2005. sandy rubble bay area. Photographer: Candy Armstrong
I really look forward to hearing from you
Wendy at Wakatobi
Brown, W., 2005 (Sep 10) Flabellina riwo from Sulawesi, Indonesia. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/14716
This is Flabellina riwo. It is nice to have some photos showing the colour pattern so clearly. Your animal sees to have been damaged - the back half seems to be regrowing.
August 23, 2005
I think this is Flabellini riwo. It was found at Kubu, which is 5 km. north of Tulamben.
Locality: Kubu, Bali, Indonesia.Depth: 40 feet. Length: 10 mm. 25 July 2005. silt covered rubble. Photographer: Marli Wakeling
firstname.lastname@example.orgWakeling, M., 2005 (Aug 23) Flabellina riwo from Bali. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/14597
April 16, 2005
From: Yuki Shigematsu
This tiny sea slug from Tioman looks like a juvenile Flabellina bilas for me though cerata looks a bit different. It was very small less than 1 cm. Can you identify this sea slug?
Locality: Tioman island, Malaysia, South China Sea. Depth: approx 15 m. Length: less than 10 mm. 25 March 05. Photographer: Yuki Shigematsu
email@example.comShigematsu, Y., 2005 (Apr 16) Flabellina riwo from Tioman, Malaysia. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/13489
Flabellina bilas, Flabellina bicolor and Flabellina riwo are three species of the genus with these chracteristic 'paddle-shaped' oral tentacles. The only species with the white reticulate pattern on the body and a purple band on the cerata, as in your animals, is Flabellina riwo. The original description of this species does not mention any yellow in the colour pattern but your photos, and others already on the Forum, show that it can have a yellow band on the cerata, above the purple one, and can also have a yellow mark at least on the dorsal surface of the paddle-shaped tip to the oral tentacles.
July 31, 2002
From: Shouichi Kato
This animal was found on a rocky reef, 10m in depth. I sent this picture to Mr. Ono and he advised me this animal was Flabellina riwo. It was 35mm in size, characterized by its very large oral tentacles. Their motion was very interesting to me.
firstname.lastname@example.orgKato, S., 2002 (Jul 31) Flabellina riwo from Hachijo Is., Japan. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/7668
I guess the oral tentacle motion you found interesting was the way it 'flaps' its paddle-like oral tentacles up and down as it crawls along. As I mentioned in an earlier message, this species and Flabellina bicolor both have this behaviour, but I have never seen anyone else ever mention seeing it. I am glad someone else has now reported it as I was beginning to wonder if I had dreamed it.
April 9, 2001
From: Lindsay Warren
Some time ago you asked if someone might have a shot of Flabellina riwo showing it in more detail. I hope the shot I have attached helps. I found
this specimen (OS0732) on 24 August 1999 at 9.40 am on Pulau Kaledupa, Tukang Besi Archipelago, SE Sulawesi at a depth of 45 ft on a rubble slope crawling over coralline algae. Size: 14 mm. [Operation Wallacea] Photo: Lindsay Warren.
All the best
Warren, L, 2001 (Apr 9) Flabellina riwo from SE Sulawesi, Indonesia. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/4131
Thanks for the photo. I've included two enlargements as well to show the colour pattern of the head and cerata. A good photo is definitely worth a thousand words.
July 15, 1999
From: Grey McNeil
Could you identify this photo please. The details are:
RASCHS REEF, MADANG, Papua New Guinea, 7m, December 1998, 1cm long alive.
GREYMACIND@bigpond.com.auMcNeil, G., 1999 (Jul 15) Flabellina riwo from Papua New Guinea. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/1002
This is Flabellina riwo. Not a lot to say about it except that it seems to be one of the species of Flabellina with large flattened oral tentacles as in Flabellina bicolor, which tend to test the path as the slug moves along by 'flapping' the paddle-like tentacles on the substrate.
Bill Rudman.Rudman, W.B., 1999 (Jul 15). Comment on Flabellina riwo from Papua New Guinea by Grey McNeil. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/1002