Special member state territories and the European Union claim of Adélie Land in Antarctica) is a French Overseas Territory but has no permanent population. It has "sui generis" status within France. Saint-Pierre and Miquelon, Saint Barthélemy, French Polynesia, and Wallis and Futuna are overseas collectivities (formerly referred to as overseas territories) of France, while New Caledonia is a ""sui generis" collectivity". Saint Barthélemy and Saint-Pierre and Miquelon use the euro, while New Caledonia, French Polynesia and Wallis and Futuna use the CFP Franc, a currency which is tied to the euro and guaranteed by France. Natives of the collectivities are European citizens owing to their French citizenship and
New Caledonia rivers and lakes of New Caledonia. Some, such as "Neogalaxias", exist only in small areas. The nautilus—considered a living fossil and related to the ammonites, which became extinct at the end of the Mesozoic era—occurs in Pacific waters around New Caledonia. There is a large diversity of marine fish in the surrounding waters, which are within the extents of the Coral Sea. Several species of New Caledonia are remarkable for their size: "Ducula goliath" is the largest extant species of pigeon; "Rhacodactylus leachianus", the largest gecko in the world; "Phoboscincus bocourti" the largest skink in the world, thought to be