Hermissenda crassicornis from Sth Korea

February 24, 2006
From: Dong Bum Koh

Dear Bill,
Here is a beautiful photo from my friend Ok Soo Kim. The smaller one Has partially broken cerata on the left side. Is this tailing behavior before mating?
Could you give more informations for me?

Locality: Ul Jin, Gyung Book Prov., -15 m, Korea, East Sea, 23 Jan. 2005, Rocky. Length: Approx. 20~40 mm. Photographer: Ok Soo Kim.

Best regards,
Dong Bum Koh

drkoh@seasee.co.kr

D.B.Koh, 2006 (Feb 24) Hermissenda crassicornis from Sth Korea. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/15925

Dear Koh,
It is indeed a nice photo. From just one photo, I can't be sure what is happening, but I suspect we may be seeing the larger animal attempting to eat the smaller one, rather than attempting to mate. Cannibalistic behaviour has been observed in both juvenile and adult Hermissenda crassicornis by  a number of research workers [see Avila, Tyndale & Kuzirian, 1998] has been obsrerved.

The close-up photo alongside shows the damaged ceratal clusters, and also the structure of the rhinophores

  • Avila, C., Tyndale, E., & Kuzirian, A.M. (1998) Feeding behaviour and growth of Hermissenda crassicornis (Mollusca: Nudibranchia) in the Laboratory. Mar. Fresh. Behav. Physiol., 31: 1-19.
Best wishes,
Bill Rudman Rudman, W.B., 2006 (Feb 24). Comment on Hermissenda crassicornis from Sth Korea by Dong Bum Koh. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/15925

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