Spiny lobster

Spiny lobsters, also known as langouste or rock lobsters are a family (Palinuridae) of about 45 species of achelate crustaceans, in the Decapoda Reptantia. Spiny lobsters are also called crayfish, sea crayfish or crawfish. Like true lobsters, spiny lobsters are edible and are an economically significant food source; they are the biggest food export of the Bahamas.

The largest spiny lobster on record was over 1 m (3 ft) long and weighed over 11.8 kg (26 lb)

Spiny lobsters are found in almost all warm seas, including the Caribbean and the Mediterranean Sea, but are particularly common in Australasia, where they are referred to commonly as crayfish or sea crayfish (Jasus novaehollandiae and Jasus edwardsii), and South Africa (Jasus lalandii). A new species, Palinurus barbarae was described in 2006.

Spiny lobsters tend to live in crevices of rocks and coral reefs, only occasionally venturing out at night to seek snails, clams, crabs, sea urchins or carrion to eat. Sometimes, they migrate en masse, in long files of lobsters across the sea floor. Potential predators may be deterred from eating spiny lobsters by a loud screech made by the antennae of the spiny lobsters rubbing against a smooth part of the exoskeleton. Spiny lobsters usually exhibit social habit by being together. However recent studies indicate that healthy lobsters move away from infected ones leaving the diseased lobsters to fend for themselves.

from http://en.wikipedia.org