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Harlequin shrimp

Hymenocera picta

Harlequin shrimp
Photo by Robin White · CC BY

About

The harlequin shrimp is a small, boldly coloured reef shrimp of the tropical Indian and Pacific Oceans, usually seen living in pairs. It grows up to 5 cm long.

Also known as: eastern harlequin shrimp, hymenocera picta, hymenocera picta dana, 1852, western harlequin shrimp

Length
5 cm
Depth
up to 20 m

How to tell it apart

It is sometimes split into two near-identical species. This form, from the central and eastern Pacific, has deep pinkish-purple spots edged in yellow; a very similar shrimp from the Indian Ocean and western Pacific has brownish spots edged in blue instead.

Appearance

This shrimp has a pair of large, flattened, paddle-like claws and thin, flattened eyes. Its body is cream or white, marked with bold spots that vary in colour across its range. Two petal-shaped antennules on its head help it smell out prey. It has two walking legs on each side, and males are slightly smaller than females.

Did you know?

This shrimp preys almost only on starfish, including the coral-eating crown-of-thorns starfish, and can kill one within a few days by attacking it while it is still alive.

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