Palaeoisopus, Palaeopantopus andPalaeothea, pycnogonid arthropods from the Lower Devonian Hunsriick Slate, West Germany Bergström, Jan ; Stürmer, Wilhelm ; Winter, Gerhard Abstract Publication: PalZ Pub Date: June 1980 DOI: 10.1007/BF02985882 Bibcode: 1980PalZ...54....7B