Crinoids often have resident shrimp; maybe they always do, because the shrimp are usually hard to find: they are well-camouflaged and like to hide.

his whip-coral shrimp has captured a delicious blob, and rises from its usual position hunkered against the coral to devour it.

Dasycaris ceratops "Ceratops" means "horn face" and sounds like an insult invented by teenagers. Originally the name was applied to a...

A Coleman Shrimp has found a home amid the spines of a fire urchin. Coleman shrimp are surprisingly well camoflaged among the spines of fire urchins. Coleman shrimp live only on certain species of fire urchins, commonly in pairs, but this one's partner was not around at the moment. Usually I try to touch nothing underwater, but while making this photo I brushed my hand against a fire urchin and got a spine in my thumb. It was extremely painful for a couple of hours, then subs