Pterygotid eurypterids (Arthropoda, Chelicerata) in the Silurian and Devonian of Bohemia.

Representatives of the family Pterygotidae Clarke et Ruedemann, 1912 from the Ludlovian, Přídolian and Lochkovian strata of the Barrandian area, central Bohemia (Czech Republic) are reviewed and discussed: Acutiramus bohemicus (Barrande, 1872), A.  perneri sp. n, A. nobilis (Barrande, 1872), Pterygotus barrandei Semper 1898, P. kopaninensis Barrande, 1872 and doubtful species P. mediocris Barrande, 1872 and P. blahai Semper 1898. Pterygotids show their maximum development in strata of Přídolian age and they tend to be concentrated in offshore dark platy limestone facies with anoxic bottom influences. They are constituents of marine faunae and exhibit the same environmental dependence as the coeval phyllocarid crustaceans of the fam. Ceratiocarididae.