Pterospermella |
Pterospermella circumstriata
|
Canada(Ontario) |
Late Siegenian |
Emsian |
Pterospermella |
Pterospermella dichlidosis
|
Oklahoma |
Late Gedinnian |
|
Pterospermella |
Pterospermella dichlidosis
|
Canada(Ontario) |
Late Siegenian |
Emsian |
Pterospermella |
Pterospermella hermosita
|
Ohio |
Givetian |
|
Pterospermella |
Pterospermella latibalteus
|
Ohio |
Middle Famennian |
Late Famennian |
Pterospermella |
Pterospermella malaca
|
Oklahoma |
Late Gedinnian |
|
Pterospermella |
Pterospermella onondagaensis
|
Canada(Ontario) |
Eifelian |
Givetian |
Pterospermella |
Pterospermella radiata
|
Ohio |
Middle Famennian |
Late Famennian |
Pterospermella |
Pterospermella reticulata
|
Oklahoma |
Late Gedinnian |
|
Pterospermella |
Pterospermella reticulata
|
Ohio |
Givetian |
|
Pterospermella |
Pterospermella solis
|
Ohio |
Middle Famennian |
Late Famennian |
Pterospermella |
Pterospermella verrucaboia
|
Oklahoma |
Late Gedinnian |
|
Pterospermopsis |
Pterospermopsis onondagaensis
|
Canada(Ontario) |
Eifelian |
Givetian |
Ptilotoscolus |
Ptilotoscolus erymnus
|
Oklahoma |
Late Gedinnian |
|
Pustulisphaeridium |
Pustulisphaeridium levibrachium
|
Ohio |
Middle Famennian |
Late Famennian |
Puteoscortum |
Puteoscortum polyankistrum
|
Indiana |
Late Frasnian |
Early Famennian |
Quisquilites |
Quisquilites buckhornensis
|
Oklahoma |
Frasnian |
Famennian |