Malacostraca
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Malacostraca is the second largest of the six classes of pancrustaceans after insects, containing about 40,000 living species, divided among 16 orders. Its members, the malacostracans, display a great
Leptostraca such as Nebalia bipes retain the primitive condition of having seven abdominal segments.
Grapsus grapsus, a terrestrial crab
Squilla empusa, a mantis shrimp
Odontodactylus scyllarus (Hoplocarida: Stomatopoda)
Eumalacostraca
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Eumalacostraca is a subclass of crustaceans, containing almost all living malacostracans, or about 40,000 described species. The remaining subclasses of crustaceans that are not in Eumalacostraca are
