Eurypterida (Sea Scorpions) is a class of Chelicerata. There are 116 species of Sea Scorpions, in 57 genera and 17 families. It includes groups like Mycteropidae, Slimoniidae, and Stylonuridae.
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