This is a difficult species to find, especially on Maui.  Not only are they considered rare, but their camouflage ability is superb.  Their cerata, while folded in a resting state, will unfurl into a leaf-like pattern almost identical to the bryopsis it feeds upon. The individual photographed here was found in less than 3 metres of water on a patch of Bryopsis pennata, growing on a large small lobe coral head. As I had to dive down in order to take these photos, in rather rough conditions, I am not absolutely certain whether there are one or two animals photographed here, but I’m pretty sure it’s all the same animal.  In one photo you can see an orangish marginal line running along the base of its notum.  The rusty-orange colour drew my attention and I expected to find a Elysia rufescens (Rusty Elysia). I took several photos before identifying it (through image on back of camera) as a different sacoglossan (sap-sucking slug).  From the tip of its nose to the end of its long tail, this animal was at least 40 mm. For more information and photos of animals that look quite different, see Sea Slugs of Hawaii.