The 67,000 described species range in size from Stygotantulus stocki at 0.1 mm (0.004 in), to the Japanese spider crab with a leg span of up to 3.8 m (12.5 ft) and a mass of 20 kg (44 lb). The three classes Cephalocarida, Branchiopoda and Remipedia are more closely related to the hexapods than they are to any of the other crustaceans ( oligostracans and multicrustaceans). It is now well accepted that the hexapods ( insects and entognathans) emerged deep in the Crustacean group, with the completed group referred to as Pancrustacea. The crustacean group can be treated as a subphylum under the clade Mandibulata. Cladistically included but traditionally excluded taxaĬrustaceans belong to the subphylum Crustacea ( / k r ə ˈ s t eɪ ʃ ə/), and form a large, diverse group of arthropods including decapods, seed shrimp, branchiopods, fish lice, krill, remipedes, isopods, barnacles, copepods, amphipods and mantis shrimp.
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