Multicrustacea (Typical Crustaceans) is a superclass of arthropods. There are 53434 species of Typical Crustaceans, in 8049 genera and 937 families. It includes groups like Copepods and Malacostracans.
Definition: Hard framework, internal or external, which supports and protects softer parts of plant, animal or unicellular organism, and to which muscles usually attach in animals, includes skeletons (derived from Lawrence, 2005).
Definition: A light sensing organ composed of multiple ommatidia, visual units consisting of a limited number of rhabdomeric photoreceptor cells, cornea-secreting epithelial cells, interommatidial pigment cells, and sometimes crystalline cone cells