I think cephale means "head", as in the case of cephalopods, but what is does "Arco" mean? All I can think of is either the Arco gas company or a misspelling of acropolis. Anyone have insights into the name of this nation?
Hmm... acrocephalia is a medical term for someone with a pointed or conelike head. If 'arco' is a misspelling of 'acro', then that means Arcoscephaleans are coneheads.