Papua New Guinea, Guam, Palau, the Philippines and the Maldives
near Honiara, Solomon Islands, 8m. June 2001. Photo: Bruce Potter.
Living animals are turquoise bluish green. The parapodial margin is a burnt orange colour. Below that is a narrow line of black followed by a region of vivid blue pigment. This black and blue pigment is also on the head and the mid region of the rhinophores. The tips of the rhinophores are orange while the base are the same turquoise blue-green of the body. Orange, black and blue bands are also present on the anterior margins of the foot. T. undula is similar in colour to T. neona Gosliner, 1995. Both have a turquoise body with burnt orange, black and blue undulating parapodial bands. However T. neona has additional bright orange markings on the parapodia, anterior margin of the foot and the rhinophores. In T. undula the orange, blue and black markings on the rhinophores are transverse bands, while in T. neona they are diagonal. T. undula is even closer in colour to T. lineolata (Bergh, 1905), the main difference being that the colour bands at the parapodial edge undulate in T. undula and are parallel to the edge in T. lineolata. Gosliner reports that the two species differ in the branching of the veins off the pericardium, highly branched in T. undula and only bifurcating in T. lineolata.
See Thuridilla coerulea for comparison with the similarly coloured T. undula and T. lineolata.
- Gosliner, T.M. (1995) The genus Thuridilla (Opisthobranchia: Elysiidae) from the tropical Indo-Pacific, with a revision of their phylogeny and systematics of the Elysiidae. Proceedings of the California Academy of Sciences, 49(1): 1-54.
Rudman, W.B., 2001 (June 9) Thuridilla undula Gosliner, 1995. [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/thurundu
January 17, 2006
From: Erwin Kodiat
Concerning message #15370:
This is another Thuridilla undula picture, it was taken at Padang Bai, Bali.
Locality: Ferry Channel, Padang Bai, Amuk Bay. Bali, Indonesia. Depth: 17 meters. Length: 2 cm. 26 November 2005. Slope. Photographer: Erwin Kodiat
firstname.lastname@example.orgKodiat, E., 2006 (Jan 17) Re: Thuridilla undula from Bali. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/15562
November 29, 2005
From: Linda Ianniello
We found two Thuridilla undula on Karang Koka Island, off SE Sulawesi, which I believe expands its range. Here is a shot of one of them.
Locality: Seletan dive site, Karang Koka Island, SE Sulawesi, Indonesia, Banda Sea. 8 November, 2005. Coral wall. Photographer: Linda Ianniello
email@example.comIanniello, L., 2005 (Nov 29) Thuridilla undula from Karang Koka, Banda Sea. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/15370
It's nice to be able to fill in a gap in its distribution
November 29, 2005
From: Roberto Sozzani
Following Linda Ianniello's message [#15370] I've found a photo of a Thuridilla undula from Manado, North Sulawesi, to fill the gap a little bit more.
Locality: Manado, Indonesia. Depth: 12 metres. Length: 8-10 mm. June 2003. muddy with some corals. Photographer: Roberto Sozzani
firstname.lastname@example.orgSozzani, R., 2005 (Nov 29) Re: Thuridilla undula from Karang Koka, Banda Sea. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/15385
Thanks for the quick response. It certainly looks dwarfed between the ascidians
June 14, 2001
From: Bruce Potter
Here is a small slug that I found yesterday. It was about 15mm long. I found it at about 8 meters on a rubble site just outside of Honiara in Solomon Islands. I cannot find it in your species list, but it looks like one identified by Debelius as Thuridilla undula. Do you agree.
I am having problems with my computer, so the image is not the best.
email@example.comPotter, B., 2001 (Jun 14) Thuridilla undula from the Solomon Ids. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/4505
Yes this is Thuridilla undula, another species which hasn't until now made the Forum.