Perisaccus |
Perisaccus devonicus
|
USSR(Latvian SSR) |
Early Frasnian |
|
Archaeotriletes |
Archaeotriletes hamulus
|
USSR(Latvian SSR) |
Early Frasnian |
Middle Frasnian |
Lophotriletes |
Lophotriletes rotundus
|
USSR(Latvian SSR) |
Early Frasnian |
Middle Frasnian |
Dictyotriletes |
Dictyotriletes devonicus
|
USSR(Latvian SSR) |
Early Frasnian |
Middle Frasnian |
Hymenozonotriletes |
Hymenozonotriletes radiatus
|
USSR(Latvian SSR) |
Early Frasnian |
Middle Frasnian |
Retusotriletes |
Retusotriletes simplex
|
USSR(Latvian SSR) |
Early Frasnian |
Middle Frasnian |
Acanthotriletes |
Acanthotriletes denticulatus
|
USSR(Latvian SSR) |
Early Frasnian |
Middle Frasnian |
Lophotriletes |
Lophotriletes rugosus
|
USSR(Latvian SSR) |
Early Frasnian |
Middle Frasnian |
Archaeozonotriletes |
Archaeozonotriletes polymorphus
|
USSR(Latvian SSR) |
Early Frasnian |
Middle Frasnian |
Stenozonotriletes |
Stenozonotriletes formosus
|
USSR(Latvian SSR) |
Early Frasnian |
Middle Frasnian |
Stenozonotriletes |
Stenozonotriletes recognitus
|
USSR(Latvian SSR) |
Early Frasnian |
Middle Frasnian |
Stenozonotriletes |
Stenozonotriletes lasius
|
USSR(Latvian SSR) |
Early Frasnian |
Middle Frasnian |
Stenozonotriletes |
Stenozonotriletes argenteus
|
USSR(Latvian SSR) |
Early Frasnian |
Middle Frasnian |
Lophozonotriletes |
Lophozonotriletes crassatus
|
USSR(Latvian SSR) |
Early Frasnian |
Middle Frasnian |
Lophozonotriletes |
Lophozonotriletes curvatus
|
USSR(Latvian SSR) |
Early Frasnian |
Middle Frasnian |
Hymenozonotriletes |
Hymenozonotriletes elegans
|
USSR(Latvian SSR) |
Early Frasnian |
Middle Frasnian |
Archaeoperisaccus |
Archaeoperisaccus ovalis
|
USSR(Latvian SSR) |
Middle Frasnian |
|