| original |
Silurian |
|
Poland |
Kielan-Jaworowska,Z. Polychaete jaw apparatuses from the Ordovician and Silurian of Poland and a comparison with modern forms. |
1966 |
| details |
Silurian |
|
Europe |
Taugourdeau,P. Scolecodont dispersa |
1978 |
| details |
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 |
| details |
Late Tremadocian |
Early Arenigian |
Canada(Newfoundland) |
Underhay,N.K. et al. Lower Ordovician scolecodonts from the Cow Head Group, Western Newfoundland. |
1995 |
| details |
Late Llandoverian |
Early Wenlockian |
Sweden(Gotland) |
Eriksson,M. Lower Silurian polychaetaspid polychaetes from Gotland, Sweden. |
1997 |