Tylodina sp. 1
Order: NOTASPIDEA
Superfamily: TYLODINOIDEA
Family: Tylodinidae
DISTRIBUTION
Known from Hachijo Is, and Okinawa, Japan.
PHOTO
Hachijo Island, Japan, 21 July, 2002, Depth: 10m, Length: 8mm. Photos: Chikako Nishina.
Authorship detailsRudman, W.B., 2002 (July 23) Tylodina sp. 1 [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/tylosp1
Related messages
Tylodina corticalis? from South Korea
October 26, 2006
From: Dong Bum Koh
Dear Bill,
I have received these unexpected photos from Ok Soo Kim of what I think is Tylodina corticalis.
Locality: Geo Moon Do (Island), 10m, Jeon Nam Prov., South Sea of Korea, 25 August 2006, -. Length: Total length 15mm. Photographer: Ok Soo Kim [www.okscuba.co.kr]
We can see the prominent radial ribbing shell on dosum.
Best regards,
Dong Bum Koh
drkoh@seasee.co.kr
D. B. Koh, 2006 (Oct 26) Tylodina corticalis? from South Korea. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/17640
Dear Koh,
This is indeed an interesting find. As far as I know it is only the second record of a species of Tylodina from the northwest Pacific. The only other record is the one we have on the Forum from Japan [Tylodina sp. 1 ]. It is possibly Tylodina fungina from the northeast Pacific, although as you suggest, the radial ribbing on the shell is more similar to T. corticalis from southern Australia. However the shell in T. corticalis can be either smooth or ribbed so it is possible T. fungina has a similar variability. Then again it could be an unnamed species.
Best wishes,
Bill Rudman
Re: Tylodina fungina? from Japan
September 11, 2002
From: Nishina Masayoshi
Dear Bill,
This is the same individual from different angle. I feel the mantle edge is rather crenulate then smooth.
Photo: M. Nishina
Best Regards,
Nishina Masayoshi
nishina@wips.co.jp
Masayoshi, N., 2002 (Sep 11) Re: Tylodina fungina? from Japan. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/7649Thanks Nishina,
I guess we can only be sure when its anatomy is looked at. Perhaps Richard Willan can give us an opinion from your photos
Best wishes,
Bill Rudman
Tylodina fungina? from Japan
July 25, 2002
From: Nishina Masayoshi
Dear Bill,
I am not sure of this species. Is this Tylodina fungina?
Data:
Date: 21 July, 2002
Location: Hachijo Island Japan
Depth: 10m
Length: 8mm
Photo C. Nishina
Best Regards,
Nishina Masayoshi
nishina@wips.co.jp
Masayoshi, N., 2002 (Jul 25) Tylodina fungina? from Japan. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/7624Dear Nishina,
This is indeed another interesting find. Until the recent photo of Tylodina sp. from Okinawa (Hamatani, 2000), I know of no record of Tylodina or the similar Anidolyta from the NW Pacific.
I am not sure if your animal is a species of Tylodina or Anidolyta as they can only be distinguished anatomically. The mantle edge is said to be crenulate in Anidolyta and smooth in Tylodina but again I can't see the mantle edge in your photos. I very much doubt that it is the eastern Pacific species Tylodina fungina. The shape of the rhinophores seem more elaborate than the other species illustrated on the Forum so it is possibly an unnamed species. Perhaps Richard Willan who has studied these genera, can give us a comment.
• Hamatani, I. (2000) [In} Okutani, T. Marine Mollusks in Japan. Tokai University Press: Tokyo.
• Willan, R.C. (1987): Phylogenetic systematics of the Notaspidea (Opisthobranchia) with reappraisal of families and genera. American Malacological Union Bulletin, 5(2): 215-241.
Best wishes,
Bill Rudman
