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 Arthropoda :: xiphosura 
Horseshoe crabs
Unlike all other living chelicerates, horseshoe crabs have compound eyes. However, the eyes appear smooth because the many subunits of the eyes, or ommatidia, are covered by a single thick cornea.
Introduction to the Xiphosura
There are only 3 genera and 5 species of Xiphosura left alive today, but they were much more numerous and diverse during the Palaeozoic era.
Order Synziphosurida
The Synziohosurines are a small, fairly diverse, paraphyletic / ancestral group of primitive Xiphosura. Rather trilobite-like in appearance.
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