Author Continent Country Date Period Genus Alberstadt NA USA - KY 1979 Ordovician Platystrophia Benedetto SA Argentina 1987 Ordovician Platystrophia Sinclair NA Canada 1946 Ordovician Platystrophia Alberstadt NA USA - OK 1970 Ordovician Platystrophia Alexander NA USA - IN 1989 Ordovician Platystrophia Alichova Europe Russia 1969 Ordovician Platystrophia Ami NA Canada 1893 Silurian Platystrophia Andreeva Asia Russia 1977 Ordovician Platystrophia Austin NA USA - OH 1927 Ordovician Platystrophia Baarli Europe Norway 1995 Silurian Platystrophia Bassett Europe Sweden 1974 Silurian Platystrophia Bassler NA USA - TN 1932 Ordovician Platystrophia Bates Europe England 1968 Ordovician Platystrophia Carlisle Europe Ireland 1979 Ordovician Platystrophia Carss NA USA - NV 1963 Ordovician Platystrophia Case NA USA - MI 1915 Devonian Platystrophia Foerste NA USA -KY 1914 Silurian Platystrophia Greger NA USA - MO 1936 Ordovician Platystrophia Hall NA USA - CA 1963 Ordovician Platystrophia Harper Europe Scotland 1984 Ordovician Platystrophia Harper Europe Norway 1993 Ordovician Platystrophia Hiller Europe Wales 1980 Ordovician Platystrophia Hints Europe Estonia 1979 Ordovician Platystrophia Holtedahl Arctic 1922 Cambrian Platystrophia Holzwasser NA USA - NY 1926 Ordovician Platystrophia Hussey NA USA - MI 1926 Ordovician Platystrophia Koch Europe Greenland 1948 Ordovician Platystrophia Lamont Europe England 1934 Silurian Platystrophia Lesperance Europe Belgium 1987 Ordovician Platystrophia Liu Asia China 1985 Ordovician Platystrophia Ludvigsen Arctic 1975 Ordovician Platystrophia Macomber NA USA - WY 1970 Ordovician Platystrophia Middleton Europe Sweden 1991 Ordovician Platystrophia Neuman NA USA - ME 1963 Ordovician Platystrophia Nikiforova Europe Ukraine 1954 Silurian Platystrophia Ockerman NA USA - WI 1926 Ordovician Platystrophia Picard Asia Israel 1952 Silurian Platystrophia Poulsen Europe Greenland 1943 Silurian Platystrophia Reed Europe Scotland 1935 Silurian Platystrophia Rice NA USA - MN 1987 Ordovician Platystrophia Roemer Europe Germany 1861 Silurian Platystrophia Ross NA USA - MT 1957 Ordovician Platystrophia Rubel Europe Estonia 1963 Silurian Platystrophia Schuchert Arctic 1900 Silurian Platystrophia Watkins NA USA - WI 1993 Silurian Platystrophia Winchell NA USA - MN 1895 Silurian Platystrophia Zin Asia China 1990 Ordovician Platystrophia