Why are decapods called ten-legged crustaceans?
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crustacean
The American lobster (Homarus americanus) is among the largest crustaceans.
Decapods are called "ten-legged" crustaceans because the name is derived from the Greek words deca- (meaning ten) and -poda (meaning feet or legs). This name specifically refers to the presence of five pairs of thoracic appendages, known as pereiopods, which are a defining characteristic of the order Decapoda.12
In these arthropods, these ten legs are attached to the thorax, and in many species, one or more pairs are modified into pincers used for feeding, defense, or interaction with their environment. While these appendages are primarily used for walking, other thoracic appendages may be adapted for different functions, such as swimming or food manipulation.12