What Is This?

Sorting through images for an article, I came across this photo from my recent trip to Ambon. I think it's a really small crustacean of some sort...perhaps a mantis shrimp?

The little critter is perched atop a bit of Halimeda algae, so it's easy to get a sense of scale (really small!).

I can make out its eye, what looks like a pair of really long legs sticking out to the left, and what appear to be retracted claws (which is what makes me lean toward mantis shrimp as an ID).

Any crustacean experts out there happen to know what this is?