Japan to eastern Australia
Entrance to Wallis Lake, Tuncurry, Tuncurry, New South Wales, Australia, 1 Feb 1988. 12mm long alive. AM C155113. Photos: Bill Rudman
These species has a very characteristic colour pattern, orange body with a series of large white patches on the dorsum. It has prviously been recorded only from Japan but Bernard Picton's records here from Hong Kong, and my record from eastern Australia suggest it either has a much wider natural distribution or is being spread perhaps by shipping.
• Baba, K. (1964). Description if Eubranchus inabai n. sp. from Mukaishima, Japan (Nudibranchia-Eolidoidea). Publications of the Seto Marine Biological Laboratory, 12(4): 13-15.
Rudman, W.B., 2001 (March 6) Eubranchus inabai Baba, 1964. [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/eubrinab
September 11, 2002
From: Jun Imamoto
As for this sea slug, it doesn't seem to be reported to the Forum from Japan, so here is a Japanese individual. They were found on a rock wall in shallow water. There were many sponges and seaweed. I am happy if these reports are useful for your research.
Date: 10 July 2002
Location: Wakasa Bay, Echizen-coast, Japan
Size: About 5-6mm
email@example.comImamoto, J., 2002 (Sep 11) Eubranchus inabai from Japan.. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/7783
It's nice to get some photos from Japan, as that is where it was originally described from.
March 13, 2001
I consider Eubranchus inabai to have been introduced into eastern Australia by shipping. It would be worth people keeping an eye out for it to decide whether it has established in this country or not. Following my review of all marine molluscs potentially introduced into Australia (I presented an address on this topic at the mollusc conference in Sydney last year), I believe the following 8 species of opisthobranchs are non-indigenous: Aplysiopsis formosa, Kaloplocamus ramosus, Polycera capensis, Polycera hedgpethi, Janolus hyalinus, Eubranchus inabai, Tenellia adspersa, Godiva quadricolor.
Willan, R.C. (2000) Marine molluscan introductions into/within Australia: can we do any more than monitor the arrival and spread of non-indigenous species? Molluscs 2000 Abstracts: page 87.
Richard.Willan@nt.gov.auWillan, R., 2001 (Mar 13) Re: Eubranchus inabai from Australia. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/3956
March 9, 2001
From: Bernard Picton
Concerning your comment on their apparently unusual distribution, I noticed in Hong Kong that Sargassum had a load of epiphytic hydroids and Bryozoans on it. Now Sargassum has spread to the UK and France with Oyster cultivation, but seems to have arrived without its associated species. I wonder if this is another possibility for these small animals getting around the planet?
firstname.lastname@example.orgPicton, B., 2001 (Mar 9) Re: Eubranchus inabai from eastern Australia. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/3951
I don't see why not. I suspect it's why Vayssierea felis, despite its direct development, has such a wide geographic distribution. It is often found feeding on the tube worm Spirorbis attachd to laminarian algae.
March 8, 2001
From: Bernard Picton
Here are photos of a Eubranchus species from Hong Kong which I identified as Eubranchus inabai Baba, 1964. They were found feeding on small hydroids on Sargassum in shallow water.
UPPER PHOTO: NW Kong Chau, Mirs Bay - 11 April 1983 - 5mm long [BEPHK91]
LOWER PHOTO: West Pak Sha Chau, Mirs Bay - 14 April 1983 - 5m - 4mm long [BEPHK190]
email@example.comPicton, B., 2001 (Mar 8) Eubranchus inabai from Hong Kong. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/3934
This gives me a reason to post some photos of this species from eastern Australia. I don't know if the occurrence in Australia is part of its natural distribution or the result of shipping, although the region where they were found, is a small fishing village rather than an international sea port.
March 8, 2001
From: Bill Rudman
To accompany Bernard Picton's message with photos of Eubranchus inabai from Hong Kong, here is a photo of an animal from New South Wales in eastern Australia. I have posted the details, and more photos at the top of the page. I don't know if its occurrence in eastern Australia is part of its natural distribution or the result of shipping, although the region where they were found is a small fishing village, rather than an international sea port.