Trinucleus abruptus Hughes, 1971.
Two perfect complete juvenile Trinucleids on green siltstone. The wide cephalic fringe with a single row of pits is very characteristic for this species.
Ordovician, Lower Llanvirn Series, Abereiddian Stage, Camnant Mudstone Group.
Tile Quarry, Upper Gilwern Hill near Hundred House, Powys, Wales.
Both Trilobites : 0.8 cm long.
