Crabs

Also called: urchin crab.

Scientific name: Dorippe frascone

It's very suprising seeing a sea urchin moving quickly along the sandy bottom. On closer inspection, you'll see that the urchin is being carried around by a crab, a species specifically adapted to the purpose, distinct from decorator crabs.

Also called: yellowline arrow crab.

Scientific name: Stenorhynchus seticornis

The very spider-like little guys are almost always found hiding around anemones.

Scientific name: Lissocarcinus laevis

These small spotted crabs live at the base of stalk anemones.

Scientific name: Superfamily Paguroidea

There are over 500 individual species of hermit crabs, so telling one from the other when they're in their shell is a bit difficult.

Scientific name: Superfamily Periclimenes

Periclimenes is a huge group of small shrimps that are often found on corals, anemones and even sea stars.

Scientific name: Periclimenes colemani

These little black and white critters are found almost exclusively riding around on fire urchins.

Scientific name: Neopetrolisthes maculosus

These crabs seem to be easier to find a night, when they come out on top of their anemone hosts. By day they usually hide under the anemone./p>

Also called: Harlequin mantis shrimp, painted mantis shrimp.

Scientific name: Odontodactylus scyllarus

Also called: Marble Shrimp

Scientific name: Saron marmoratus

Also called: Thor Shrimp

Scientific name: Thor amboinensis

You gotta love the common name for this guy, which apparently comes from the way it shakes its body.

Scientific name: Zebrida adamsii

These little black and white critters are found almost exclusively riding around on fire urchins.

Scientific name: Achaeus japonicus

With its long legs and “hairy” red color, the common name of this crab seems like a good fit. We saw a large number of these around Bangka island and the Lembeh strait. They're commonly found, as pictured, on bubble coral.

Scientific name: Ancylomenes pedersoni

Not too sure about this identification, but for the myriad of small shrimps I could find pictures of, this is the closest match.

Also called: painted rock lobster, common rock lobster, bamboo lobster, blue lobster, and blue spiny lobster.

Scientific name: Panulirus versicolor

These were rather common around Bangka in North Sulawesi, Indonesia.

Scientific name: Periclimenes imperator

These small shrimps are commonly found riding on the back of sea cucumbers.