Acanthochitina |
Acanthochitina barbata
|
Europe |
Caradocian |
|
Acanthochitina |
Acanthochitina secunda
|
Europe |
Llanvirnian |
Llandeilian |
Alpenachitina |
Alpenachitina eisenacki
|
North America |
Eifelian |
|
Alpenachitina |
Alpenachitina eisenacki
|
Asia |
Eifelian |
|
Amphorachitina |
Amphorachitina conifundus
|
Africa |
Tremadocian |
Arenigian |
Ampullachitina |
Ampullachitina laguncula
|
North America |
Llandoverian |
|
Ampullachitina |
Ampullachitina laguncula
|
Asia |
Llandoverian |
|
Ancyrochitina |
Ancyrochitina aculeata
|
Africa |
Llandoverian |
|
Ancyrochitina |
Ancyrochitina ancyrea
|
Europe |
Llandoverian |
Emsian |
Ancyrochitina |
Ancyrochitina ancyrea
|
North America |
Late Gothlandian |
Early Devonian |
Ancyrochitina |
Ancyrochitina ancyrea
|
Africa |
Early Gothlandian |
Early Devonian |
Ancyrochitina |
Ancyrochitina ancyrea
|
Asia |
Late Gothlandian |
Early Devonian |
Ancyrochitina |
Ancyrochitina biconstricta
|
North America |
Early Devonian |
|
Ancyrochitina |
Ancyrochitina biconstricta
|
Asia |
Early Devonian |
|
Ancyrochitina |
Ancyrochitina cervicornis
|
Europe |
Early Ordovician |
Late Gothlandian |
Ancyrochitina |
Ancyrochitina cornigera
|
North America |
Givetian |
|
Ancyrochitina |
Ancyrochitina cornigera
|
Asia |
Givetian |
|