GryphocaGryphoca is an extinct genus of earless seals from Neogene marine deposits in the North Sea basin.FossilsThere are two recognized species of Gryphoca, G. similis and G. nordica. G. similis is known from Pliocene marine deposits in the Antwerp region of Belgium, while fossils of P. nordica have been found in the Tortonian-age Gram Formation in Denmark.