original |
Middle Ordovician |
|
Poland |
Kielan-Jaworowska,Z. Polychaete jaw apparatuses from the Ordovician and Silurian of Poland and a comparison with modern forms. |
1966 |
original |
Silurian |
|
Sweden |
Bergman,C.F. Polychaete jaws. (In: Lower Wenlock faunal and flora dynamics-Vattenfallet section, Gotland. V.Jaanusson, S.Laufeld and R.Skoglund, editors) |
1979 |
original |
Middle Caradocian |
Late Ashgillian |
Estonia |
Hints,O. Ordovician eunicid polychaetes of Estonia and surrounding areas: review of their distribution and diversification. |
2000 |