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Crustaceans

 

The crustaceans are a special group in the arthropods. This group includes the crayfish, crab, lobster, shrimp, water flea, sowbug, and pill bug. They have two pairs of feelers called antennae. Their tough outer skeletons contain lime. Almost all of them live in fresh or salt water. Many of them have gills that help them take in oxygen and give off carbon dioxide.

There are two groups in the crustaceans. One group consists of the crayfish, crabs, lobsters and shrimp. They have a body divided into two sections. One is a combined head and thorax. This is called a cephalothorax. The other is the abdomen. They also have an outside or external skeleton covered by a large plate called a carapece that covers the cephalothorax. They have compound eyes that are up on two stalks and two antennae.

The other group includes the barnacles. They have an outside or external skeleton of plates, a body that is made up almost entirely of the thorax ( the head and abdomen are very small) and six pairs of appendages.

 

lobster image

Lobster

shrimp image

Shrimp

 

 

 

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