Chromodoris striatella? from Japan

June 19, 1999
From: Rie Nakano

Dear Bill
How was International Opisthobranch Workshop at Sicily?
I dived in Hachijo Island last weekend.
Hachijo Island is about 300km away from Tokyo. This island is in the temperate zone, but is affected by warm current, underwater temperature is usually 18-26 degrees (24 degrees at this time).

On the land, many subtropical plants are in bloom all year around. But we can hardly see coral, because it is composed by volcanic rock.
We can see both temperate zone opisthobranchs and subtropical ones (like Kerama Islands) in Hachijo Is. This time I watched 25 species, over 60 individuals in 6 dives. I'm so happy.
Well,I have a question.
This opisthobranch is similar to Hypselodoris maritima (Baba,1949). But the color of rhinophore and gills of this one is white. H. maritima is orange, isnt it? I've never seen typical H. maritima in Hachijo Is, nor have local divers. Instead of H. maritima, I saw this species commonly. What name is this opisthobranch!?
If it is the color variation of H.maritima, why have we never seen typical H.maritima?
Length: 40mm, Depth:10m (15m at the sunken rock wall). Photo by Rie Nakano.
Rie Nakano.

Nakano, R., 1999 (Jun 19) Chromodoris striatella? from Japan. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Rie,
The workshop was very interesting and the organisers are planning to put the abstracts on their website soon. I will let you know when they do.

Concerning your nudibranch. I have prepared pages on Hypselodoris maritima, Chromodoris striatella and Chromodoris lineolata for comparison. I am pretty sure your animal is a pale form of Chromodoris striatella. It looks very like the animal Dr Baba illustrates in his Opisthobranchs of Sagami Bay (1949)(as C. lineolata).

Rudman, W.B., 1999 (Jun 19). Comment on Chromodoris striatella? from Japan by Rie Nakano. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

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