Hypselodoris sagamiensis
(Baba, 1949)

Suborder: DORIDINA
Family: Chromodorididae


Known only from Japan.


Echizen Coast, Japan, 11-12 August 2001. Upper right: 30mm, Lower right: 20mm, Lower left: 15mm. Photos: Nishina Masayoshi.

Mantle translucent, sometimes with much of the mantle covered with opaque white. In other cases there is little opaque white pigmentation on the mantle except for low raised pustules in the central region, and a broad irregularly shaped band around the margin. There are smaller black spots scattered over the mantle and some larger diffuse black patches forming a band around the mantle just at the outer edge of the visceral mass. At the edge of the mantle is a band of purple, usually entire around the anterior end but breaking into a series of patches along the sides. Inside the purple margin is a broken band of ornage-yellow. The rhinophore stalk is white and the club red. The simple gills are translucent white with red edging. The low pustules covering the mantle are a characteristic feature of the species.

This species is one of only two species of Hypselodoris which are reported to lack mantle glands (Baba, 1995; Gosliner & Johnson, 1999).

• Baba, K. (1949) Opisthobranchia of Sagami Bay collected by His Majesty The Emperor of Japan. Iwanami Shoten, Tokyo. 194pp., 50 Pls.
• Baba, K (1995) Anatomical and taxonomical review of the four blue-patterned species of Hypselodoris (Nudibranchia: Chromodorididae) from Japan. Venus, The Japanese Journal of Malacology, 54(1): 1-15.
• 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.

Authorship details
Rudman, W.B., 2001 (August 29) Hypselodoris sagamiensis (Baba, 1949). [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet/hypssaga

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