Moridilla brockii from Western Australia

October 2, 2000
From: Drew Taylor


This is another photo taken at Bundegi Reef in Exmouth, Western Australia. I am having problems identifying this one, can you help me out?

Drew Taylor

Taylor, D., 2000 (Oct 2) Moridilla brockii from Western Australia. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Drew,
This is Moridilla brockii, one of a group of aeolids which appear quite aggressive when disturbed, 'bristling' their cerata in a show of bravado. as you'll see at the top of the page, in Moridilla the innnermost cerata in each row are much longer than the others, lying coiled like a spring, only uncoiling when the animal feels threatened. Have a look at the pages on the aeolid cnidosac and on defensive coloration in nudibranchs for information on aeolid defence methods.

Best wishes,
Bill Rudman.

Rudman, W.B., 2000 (Oct 2). Comment on Moridilla brockii from Western Australia by Drew Taylor. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


Moridilla brockii

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