Cascoplecia
Cascoplecia insolitis, commonly known as the unicorn fly, is an extinct dipteran that lived in the Early Cretaceous.  The type specimen was found in Burmese amber. George Poinar, Jr., who described this fossil, coined a new family name for it – Cascopleciidae.  One of the defining characteristics of Cascoplecia are three ocelli raised on an extended horn-like protuberance (hence its common name). Its distinctiveness has been questioned by other authors, who suggest that the taxon is simply an abberant member of Bibionidae.