Amphipod

• Found in shallow marine environments
• There are two types of amphipods: One long and skinny the other compact
• They have seven pairs of walking legs with the first four reaching forwards and the fifth to seventh reaching backwards
• Range between 1-10mm in length 

Crustaceans

• Majority are marine but some are found in freshwater
• There are not only crabs and crayfish, there are a wide range of the crustaceans species including lobster, shrimp, copepods and barnacles
• They have a hard but flexible exoskeleton
• Their walking legs are used to capture pray

Copepods

• Found in the sea and nearly every freshwater environment
• Largest group in the microscopic world of the microcrustacea
• Eat plants and animals
• Some copepods are parasitic and attach themselves to fishes and other marine mammals 

Corophium

• Corophium amphipods are often referred to as mud shrimps
• Live in U-shaped burrows, preferably without oxygen of salt marshes and estuaries

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