Sphaerochitina |
Sphaerochitina concava
|
Europe |
Late Wenlockian |
Early Ludlovian |
Sphaerochitina |
Sphaerochitina dubia
|
Europe |
Early Ludlovian |
|
Sphaerochitina |
Sphaerochitina fenestrata
|
North America |
Famennian |
|
Sphaerochitina |
Sphaerochitina impia
|
Europe |
Late Wenlockian |
Middle Ludlovian |
Sphaerochitina |
Sphaerochitina lycoperdoides
|
Europe |
Late Wenlockian |
Early Ludlovian |
Sphaerochitina |
Sphaerochitina nodulosa
|
North America |
Middle Givetian |
Late Givetian |
Sphaerochitina |
Sphaerochitina pilosa
|
Europe |
Givetian |
Middle Frasnian |
Sphaerochitina |
Sphaerochitina pilosa
|
North America |
Givetian |
Middle Frasnian |
Sphaerochitina |
Sphaerochitina sphaerocephala
|
Europe |
Late Ludlovian |
Late Pridolian |
Spinachitina |
Spinachitina cervicornis
|
Europe |
Early Caradocian |
Middle Caradocian |
Spinachitina |
Spinachitina multiradiata
|
Europe |
Middle Caradocian |
|
Urochitina |
Urochitina bastosi
|
South America |
Frasnian |
|