Look closely to see these tiny skeleton shrimp clinging to the bryozoans,The  shape and color help the shrimp to blend into their background. Their bodies are long, cylindrical and range from pale brown to green Some species can quickly change color to blend into their backgrounds.

Skeleton shrimp look like, and sometimes are called, “praying mantises of the sea.” They have two pairs of legs attached to the front end of their bodies, with three pairs of legs at the back end. The front legs form powerful “claws” for defense, grooming and capturing food. The rear legs have strong claws that grasp and hold on to algae or other surfaces. They use their antennae for filter feeding and swimming.

Diet
diatoms (microscopic plants), detritus, filtered food particles, amphipods
Size
to 1.5 inches (4 cm) long
Range
low intertidal zone and subtidal waters in bays,

Conservation Notes

Skeleton shrimp are abundant and live in many habitats, including the deep sea. They play an important role in the ecosystem by eating up detritus and other food particles.

Cool Facts

Shrimp, sea anemones and surf perch prey on skeleton shrimp. The females of some skeleton shrimp species kill the male after mating.

Skeleton shrimp use their front legs for locomotion. To move, they grasp first with those front legs and then with their back legs, in inchworm fashion. They swim by rapidly bending and straightening their bodies.

To grow, skeleton shrimp shed their old exoskeletons and form new, larger ones. They can mate only when the female is between new, hardened exoskeletons. After mating, the female deposits her eggs in a brood pouch formed from leaflike projections on the middle part of her body. Skeleton shrimp hatch directly into juvenile adults.

Source: Monterey Bay Aquarium:
Online Field Guide http://www.mbayaq.org/efc/living_species/default.asp?hOri=1&inhab=521

Also see:

http://www.nwmarinelife.com/htmlswimmers/c_laeviuscula.html