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The big boys are called "decapods" because they have 10 legs (2 are modified into pincers). These include crabs, crayfish, and lobsters. Most kids are familiar with the "pill bugs" or "rolly-pollys" that live under rocks in moist places (they are technically part of the Isopods). There are lots of tiny plankton species such as Daphnia (water fleas) referred to as Cladocerans. Additionally, there are tiny creatures that live in a bivalve shell and are called Ostracods. "Scuds" look like tiny shrimp and are Amphipods. Barnacles build houses made of limestone shell and attach themselves to various surfaces such as rocks, ships, and whales.

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13y ago

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