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Topic: Science
Number of pages / Number of words: 19 / 5091
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Animals in the Malacostraca class have the hard, calcified exoskeleton typical of crustaceans. The body is divided into three tagmata: cephalon, thorax, and abdomen. The head and thorax are combined into a cephalothorax and may be difficult to distinguish. Most malacostracans have five segments in the head, eight in the thorax, and six in the abdomen...


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Usually, each segment has a pair of appendages, but in some organisms appendages are lacking on several abdominal appendages.

Crayfish are usually about 7.5 cm, or 3 inches long, and like other arthropods, have a hard but flexible exoskeleton. The underlying epidermis secretes it. An animal with a hard exoskeleton has little need for any additional body wall, thus the body wall consists mainly of the exoskeleton and epidermis...


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