Hypselodoris sagamiensis (Baba, 1949)
- Location
- Nazumado, Hachijo Island, Tokyo, Japan
- Date
- 2016/07/26
- Length
- 20mm
- Depth
- 12.0m
- Water temperature
- 28.0℃
Description
A small Chromodorididae, body length about 25 mm. The dorsum bears scattered conical small papillae. The dorsal ground colour is yellow, with the conical papillae white. A continuous row of purple markings runs along the mantle margin, and smaller purple spots are scattered on the central dorsum. Rhinophores orange; gill leaves yellow with the tips tinged orange. The ventral body is white, with a few purple spots on the body sides and the dorsal foot. Radula formula 45×30.0.30 to 43×35-37.0.35-37. From the first lateral onward, each lateral tooth bears two cusps.Distribution
Type locality is off Nishi-no-saki, Sagami Bay (600 m offshore, 17 m depth, August 1940, 2 specimens). The original description (Baba, 1949) records the species only from the type locality.Etymology
The specific epithet sagamiensis is a place-name adjective referring to the type locality, Sagami Bay. The original description does not give an explicit etymology paragraph; the toponymic derivation is self-evident.Remarks
Originally described as Glossodoris sagamiensis and later transferred to Hypselodoris. Differs from Hypselodoris maritima and Hypselodoris placida (described in the same monograph) by the yellow ground colour with white conical papillae and the continuous row of purple markings along the mantle edge.References
- Hypselodoris sagamiensis (Baba, 1949), 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.
- Hypselodoris sagamiensis (Baba, 1949), Gosliner T.M. & Johnson R.F. (1999). Phylogeny of Hypselodoris (Nudibranchia: Chromodorididae) with a review of the monophyletic clade of Indo-Pacific species, including descriptions of twelve new species. Zoological Journal of the Linnean Society. 125: 1-114. https://doi.org/10.1111/j.1096-3642.1999.tb00585.x
- サガミイロウミウシ, 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.
- サガミイロウミウシ, 中野理枝. (2004). 本州のウミウシ. ラトルズ.
- サガミイロウミウシ, 小野篤司 & 加藤昌一. (2009). ウミウシ. 誠文堂新光社.
- Hypselodoris sagamiensis, 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.
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Photos of Hypselodoris sagamiensis
Tag:
Same Genus Nudibranchs
Similar Colors Nudibranchs
Academic Database
Sea slug observation data is available in international marine biodiversity databases.