Species ID - Philippines

[Hydros]

Hi all,

Really scratching my head with this one. The size is about 15cm and it was taken at night time on a reef in Moalboal, Philippines. The depth was approximately 10m. It was not visibly moving or engaged in any activity. My best guesses so far have been a very deformed cushion star or some sort of sea hare. I'm not particularly satisfied with either of these though! Any help would be greatly appreciated.

Thanks in advance.

 

[Searcaigh]

Sidegill slug, Pleurobranchus grandis

 

[Hydros]

Spot on, thanks! What a strange beast.

 

[Searcaigh]

Used to find lots on night dives when I lived in Jeddah.

<i>Pleurobranchus grandis</i>