- Octillaenus, Ordosaspis, Parillaenus, Platillaenus, Ptilillaenus,
Quadratillaenus, Snajdria, Spinillaenus, Stenopareia, Trigoncekovia, Ulugtella, Vysocania...
- Octillaenus, Ordosaspis, Parillaenus, Platillaenus, Ptilillaenus,
Quadratillaenus, Snajdria, Spinillaenus, Stenopareia, Trigoncekovia, Ulugtella, Vysocania...
-
rebounded with 26
species divided over
three genera during the Silurian.
Quadratillaenus tewoensis from
North China is the
youngest species known (Pridoli Epoch)...
- Qings********a
Qingzhenaspis Qinlingia Quadrahomagnostus Quadratapyge Quadratillaenus Quadratispina Quadratoproetus Quadrops Quandraspis Quebecaspis Querandinia...