Acteon sieboldii (Reeve, 1842)
Description
A medium-sized shelled cephalaspidean reaching several centimetres in shell length. The shell is robustly egg-shaped, decorated with spiral grooves. The shape evokes that of a Japanese chinquapin nut (shii-no-mi), giving rise to the Japanese common name.Distribution
Originally described from material in the H. Cuming collection. Common on sandy bottoms around Japan.Etymology
The specific epithet sieboldii honours the German physician and naturalist Philipp Franz von Siebold, who studied the flora and fauna of Japan during the late Edo period.References
- Tornatella sieboldii n. sp., Reeve L.A. (1842). A monograph of the genus Tornatella, a small group of pectinibranchiate mollusks of the family Plicacea, including descriptions of seven new species, from the collection of H. Cuming. Proceedings of the Zoological Society of London. 10: 58-62.
- オオシイノミガイ Acteon siebaldii (REEVE), 波部忠重. (1961). 続原色日本貝類図鑑. 保育社, 大阪. xii + 183 + 42 pp., 66 pls. [Habe T. (1961). Coloured illustrations of the shells of Japan (II). Hoikusha, Osaka.]
- オオシイノミガイ Acteon sieboldi (Reeve, 1842), 奥谷喬司. (2000). 日本近海産貝類図鑑. 東海大学出版会.
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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Similar Colors Nudibranchs
Academic Database
Sea slug observation data is available in international marine biodiversity databases.