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: overall repetitive or reflective pattern in the body of one individual of this taxon. eg: bilateral symmetry, rotational symmetry, radial symmetry
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