Crinoid Shrimp

Small Shrimp around 1 cm in size but very difficult to find or take picture of.
They lives in their host Crinoid and usually they are very well camouflaged with their colouration and patterns to match the Crinoid.

There are many variety of colours as in this case, white body with black and yellow markings. Other colours can be in combination of green, brown, orange, red, blue, grey, purple and shades in between. Not sure though if they are all the same species of colour variation of the same species.