Thorunna australis (Risbec, 1928)
- Location
- Horse Shoes, Okinawa Island (Onna and Yomitan area), Okinawa, Japan
- Date
- 2010/03/13
- Length
- 12mm
- Depth
- 7.0m
- Water temperature
- 22.0℃
Description
Ground colour pink. Two white longitudinal lines run from beside the rhinophores back along either side of the gill, never meeting at front or rear. Outside each white line is a row of fine red dots; in the gaps anterior and posterior to the lines, scattered white dots and diffuse purple blotches occur. Rhinophores white with a single orange ring at mid-height. Gill white with an orange band in the middle. Reaches 15 mm.Distribution
New Caledonia (type locality), South Africa, Christmas Island, Papua New Guinea, Indonesia, Guam, Philippines, Japan, Marshall Islands.Etymology
Latin australis, "southern."Remarks
Originally described as Chromodoris australis Risbec, 1928, and subsequently transferred to Thorunna.References
- Chromodoris australis, Risbec J. (1928). Contribution à l'étude des nudibranches néo-calédoniens. Faune des Colonies françaises, Tome II: 1-328, 12 pls. (Société d'Éditions géographiques, maritimes et coloniales, Paris). [doctoral thesis monograph]
- ジュッテンイロウミウシ（新称）, 小野篤司. (2000). ウミウシガイドブック. 第2版. TBSブリタニカ.
- Thorunna australis, Johnson R.F. & Gosliner T.M. (2012). Traditional taxonomic groupings mask evolutionary history: a molecular phylogeny and new classification of the chromodorid nudibranchs. PLoS ONE 7(4): e33479.
A Kindle field guide by the site author
Kimoto N. (2026). Sea Slugs of Japan & the Indo-Pacific, 2nd Edition.
Kindle Edition
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Photos of Thorunna australis
Tag:
Same Genus Nudibranchs
Similar Colors Nudibranchs
Academic Database
Sea slug observation data is available in international marine biodiversity databases.