Baltic Sea as species in 2005 and 2018 respectively, having formerly been confused with more widespread relatives. The tiny Copenhagen cockle ("Parvicardium hauniense"), a rare mussel, is sometimes considered endemic, but has now been recorded in the Mediterranean. However, some consider non-Baltic records to be misidentifications of juvenile lagoon cockles ("Cerastoderma glaucum"). Several widespread marine species have distinctive subpopulations in the Baltic Sea adapted to the low salinity, such as the Baltic Sea forms of the Atlantic herring and lumpsucker, which are smaller than the widespread forms in the North Atlantic. A peculiar feature of the fauna is that it contains a
World Network of Biosphere Reserves in Europe and North America of the World Network of Biosphere Reserves. The list does not include the "Intercontinental Biosphere Reserve of the Mediterranean", a biosphere reserve shared between Morocco and Spain, which has been classified as part of the Arab States region. "See also: " See also Portugal and Spain. See also Romania and Ukraine. World Network of Biosphere Reserves in Europe and North America Under UNESCO’s Man and Biosphere Reserve Programme, there are 302 biosphere reserves recognized as part of the World Network of Biosphere Reserves in Europe and North America (as of April 2016). These are distributed across 36 countries in the