Malacostraca

The class Malacostraca is the largest taxonomic class of crustaceans, including familiar species like crabs, lobsters, and shrimp. These animals are characterized by having a hard exoskeleton, jointed limbs, and two pairs of antennae. Malacostraca are found in a variety of aquatic habitats worldwide.

There are six classes of crustaceans. The malacostraca is the largest. Examples of animals in this class include: porcelain crabs, terrestrial crayfish and mantis shrimp.

No. spiders are in a class called, Arachnida.

The phylum is Arthropoda.

The class is Malacostraca.