Which group of arthropods typically has five to seven legs?

Crustaceans are a diverse group of arthropods that typically possess five to seven pairs of legs, which can vary based on the specific species. This characteristic is one of the defining features of crustaceans and helps distinguish them from other arthropod sub-groups. Crustaceans generally include animals such as crabs, lobsters, and shrimp, all of which exhibit this leg structure. In addition to their legs, crustaceans often have specialized appendages for various functions, such as feeding and swimming, which further differentiates them within the arthropod classification.

In contrast, chilopods, commonly known as centipedes, typically have one pair of legs per body segment. Arachnids, which include spiders and scorpions, usually have eight legs. Diplopods, better known as millipedes, typically feature two pairs of legs per body segment as well. Therefore, the leg count characteristic of crustaceans specifically supports their classification within the arthropod phylum, making them unique compared to the other mentioned groups.