Cartoon slug at Big Sisters Island

I saw the cartoonish slug again this evening at Big Sisters Island! :)


On a not-so-low tide out on the reefs, we could not really venture out far to find marine creatures. I was glad to be still able to see something special!

This cartoon slug is the Moon-headed side-gill slug (Euselenops luniceps).


When I first saw this slug, it was found on its underside facing upwards. It has a pretty brownish underside with tinge of blue.


This slug has a large plume-like gill between the mantle and the foot, usually on the right side of the body. Can you see the white gill structure on this photo?


Being flat, this adorable slug has a broad foot which is well adapted for crawling over sand or burrowing underneath.

Here is a video showing how the slug can swim in the water while flipping itself!

Moon-headed side-gill slug from Loh Kok Sheng on Vimeo.