Hypselodoris sagaminensis from southern Queensland

February 14, 2007
From: Gary Cobb

Hi Bill.
After reading the Forum entry about Hypselodoris infucata [message #19388], I thought I might bring you up to speed. In the 5 years of searching for nudibranchs here on the Sunshine Coast, we have found that Hypselodoris sagamiensis is a fairly common species. I have found hundreds of them in our search around Old Woman Island and local reefs. In our book Undersea Jewels [page 162 ] you will see it is fairly common here. As far as Richard Willan is concerned I am the first to record it in Australia. David Harasti down in New South Wales has found it there as well!

Locality: Mooloolaba Sunshine Coast, 6-18m, Queensland, Pacific Ocean, many times, Subtidal. Length: max. 15mm. Photographer: Gary Cobb.

Cheers Gary


Cobb, G.C., 2007 (Feb 14) Hypselodoris sagaminensis from southern Queensland. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/19421

Thanks Gary,

I was 'up to speed' on your finds of H. sagamiensis in southern Queensland, from your book, but I needed a photo or message to add it to the Forum. I wish I had time to search all the other excellent websites to pick up new distribution records but as you no doubt realise, I don't. When I said it was only known from the north west Pacific I was thinking in terms of what I was considering to be its 'natural' distribution.

The presence of H. sagamiensis in eastern Australia is interesting in itself, and it reminds me of H. maritima, which for a long time was known only from Japan and eastern Australia. As I mentioned recently [message #18625]  there was some thought that its presence in Australia was due to shipping, but we now have a number of records from places in between, suggesting it may be naturally found all through the western Pacific. At present H. sagamiensis seems to have a similar distribution in the north west Pacific and eastern Australia. It will be interesting to see if it begins to turn up in the tropical Pacific between these two regions.

Another equally interesting possibility is that H. sagamiensis is a colour form of H. maritima. Much of the basic pattern of the two species is the same, the main difference being that the longitudinal lines in H. maritima are replaced by spots in H. sagamiensis. However if we look at an earlier message from Erwin Koehler [#13910], it seems that H. maritima can have black spots instead of lines.

Thanks for sending the photos, they certainly reminded me of your find, and hopefully they have opened up an interesting line of investigation
Best wishes,
Bill Rudman

Rudman, W.B., 2007 (Feb 14). Comment on Hypselodoris sagaminensis from southern Queensland by Gary Cobb. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/19421

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