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This species is very similar to Tayuva lilacina (Gould, 1852) [Doris] and is also known under a variety of different names. Externally they differ by their sizes, Tayuva lilacina is usually much smaller, seldom larger than 4 cm, Sebadoris fragilis grows up to 15 cm, Dayrat (2010) writes "If preseved specimens measure more than 60 mm they have little chance to be part of lilacina". Both species are very variable and/or part of a species complex.
The above specimen might be as well Sebadoris nubilosa (Pease, 1871) [Doris] a species growing up to 20 cm, which was described from Polynesia.
The type locality of Sebadoris fragilis certainly is eastern India either Madras or Visakhapatnam. Dayrat (2010)
According to Dayrat (2010) are many pictures at the internet misidentified, those records need confirmation by checking the anatomy of other specimens from those localities. Even the picture from New Caledonia at the factsheet of Tayuva lilacina as Discodoris lilacina at the Sea Slug Forum is most likely Sebadoris fragilis.
There are some pictures of this species online, the identifications need to be confirmed, localities: Marshall Islands, Solomon Islands, Japan, Singapore, Maharashtra, India, Rinca Island, Indonesia, Bali, Indonesia, Etang Salé , île de La Réunion, Wangan Isle, Taiwan, Likoni, Kenya, Queensland, Australia, Phuket, Thailand, Hawaii, Anilao, Philippines, and Pohnpei.
Dayrat, B. 2010. A Monographic Revision of Basal Discodorid Sea Slugs (Mollusca: Gastropoda: Nudibranchia: Doridina). Proceedings of the California Academy of Sciences 61, suppl I: 1-403.
Rudman, W.B., 1999 (July 21) Discodoris lilacina (Gould, 1852). [In] Sea Slug Forum. Australian Museum, Sydney.
Available from http://www.seaslugforum.net/find/disclila
How to cite:
Köhler, E. (2017), published 27 June 2017, Sebadoris fragilis (Alder & Hancock, 1864) [Doris]
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Euctenidiacea/Sebadoris_fragilis.htm