Its name comes from the Greek words μείων ( meiōn , `` less '' ) and καινός ( kainos , `` new '' ) and means `` less recent '' because it has 18 % fewer modern sea invertebrates than the Pliocene .
Its name comes from the Greek words μείων ( meiōn , `` less '' ) and καινός ( kainos , `` new '' ) and means `` less recent '' , because it has 18 % fewer modern sea invertebrates than the Pliocene .