Eryon is an extinct member of the diverse group of arthropods called Decapoda
The skull of G
17--Isolelus gigas--Ordovician--Trenton Group
Etymology - from the Latin words: draco (meaning dragon) + rex (meaning king)
The large hollow bony crest had not yet developed on this young and small specimen
Xiphactinus audax, the X fish skull Stegosaurus Eryon is an extinct memberXiphactinus audax (from Latin and Greek for "audacious sword ray") was a large, 15 to 20 foot long predatory bony fish that lived in the Niobraran Sea, in what is now North America, during the Late Cretaceous. When alive, the beast would have resembled a gargantuan, fanged tarpon. Skeletal remains of Xiphactinus have come from Kansas, Alabama, and Georgia. Despite being preyed on by sharks and mosasaurs, X. audax was, nonetheless, a voracious predator