Ceratosoma trilobatum with commensal shrimp

September 21, 2001
From: Mary Jane Adams

Hi Bill,
Here is another example of commensalism. The shrimp was riding around on the slug like a queen on a royal coach. This Ceratosoma trilobatum with Periclimenes imperator was photographed in Lembeh Straits, Sulawesi, Indonesia, Aug. 13, 2001. Length: about 8 cm, Depth: 5 meters
Best regards,
Mary Jane

divepng@yahoo.com

Adams, M.J., 2001 (Sep 21) Ceratosoma trilobatum with commensal shrimp. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/5285

Thanks Mary Jane,
Periclimenes certainly does look very obvious when it sitting out on its 'host's' back. Whether its own eyesight is good enough to detect danger or whether the defensive glands of the nudibranch are sufficient protection I wouldn't know. It is certainly a relationship which would be worth a look at.
Best wishes,
Bill Rudman

Rudman, W.B., 2001 (Sep 21). Comment on Ceratosoma trilobatum with commensal shrimp by Mary Jane Adams. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/5285

Factsheet

Symbiosis, commensalism, mutualism and parasitism

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