Gymnodoris alba (Bergh, 1877)
- Location
- Beach, Oyashirazu, Niigata, Japan
- Date
- 2020/03/10
- Length
- 9mm
- Depth
- 5.0m
- Water temperature
- 15.0℃
Description
A medium-sized Gymnodoris reaching about 33 mm in length. In life the body is entirely white with bright orange-red round spots scattered over the dorsum, the source of the Japanese vernacular name "Akaboshi-umiushi" ("red-spot sea slug"). In preserved material the colour fades to yellowish-white with sparse yellowish spots. The clavus of the rhinophores carries 15-16 leaves on each side; the oral tentacles are very small. The gill consists of ten strongly contracted bipinnate leaves, with the anal papilla at the centre of the gill circle and the renal pore to its right. The foot is not narrow but scarcely projects at the sides, with a straight anterior edge.Distribution
Type locality: Burias, Philippines.Etymology
The Latin adjective alba ("white", feminine) is a descriptive epithet referring to the white ground colour of the body.Remarks
Originally placed in Trevelyana, later transferred to Gymnodoris.References
- Gymnodoris alba, Kelaart E.F. (1858). Description of new and little-known species of Ceylon nudibranchiate molluscs and zoophytes. Journal of the Ceylon Branch of the Royal Asiatic Society. 3(9): 84-139.
- アカボシウミウシ(新称), Baba, K. 1930a. Studies on Japanese nudibranchs (2). A. Polyceridae. B. Okadaia, n.g. (preliminary report). Venus 2(2).
- アカボシウミウシ, Baba K. (1949). Opisthobranchia of Sagami Bay collected by His Majesty the Emperor of Japan (相模湾産後鰓類図譜). Iwanami Shoten, Tokyo. 4+2+194+7 pp., pls. 1-50.
- アカボシウミウシ, 鈴木敬宇. (2000). ウミウシガイドブック〈2〉. TBSブリタニカ.
- 高岡生物研究会. (2002). 日本海のウミウシ. 第2版.
- アカボシウミウシ, 小野篤司. (2004). 沖縄のウミウシ. ラトルズ.
- アカボシウミウシ, 中野理枝. (2004). 本州のウミウシ. ラトルズ.
- アカボシウミウシ, 小野篤司 & 加藤昌一. (2009). ウミウシ. 誠文堂新光社.
A Kindle field guide by the site author
Kimoto N. (2026). Sea Slugs of Japan & the Indo-Pacific, 2nd Edition.
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Photos of Gymnodoris alba
Tag:
Same Genus Nudibranchs
Similar Colors Nudibranchs
Academic Database
Sea slug observation data is available in international marine biodiversity databases.