Here is a inexpensive UK trilobite of the species Ogygiocarella angustissima from the lower Ordovician of Wales. Ogygiocarella angustissima differs from Ogygiocarella debuchii by the higher number of pygidial segments mainly. After Hughes, 1979 is there in fact a stratigraphical trend observable.
|Pencerrig, Builth Wells, Powys, Wales|
|Size of Trilobite:||about 68 mm long|
|Age:||Lower Ordovician,Llanvirnian , Llanfawr Formation (about 455 Mill. Years)|