Microsculpture at center of disc of left elytron, third and fourth intervals. A, B, O. harpaloides, both from Colliery Bay, Ballycastle, Northern Ireland (A: voucher V100670, B: voucher V100672). C, D. O. tachysoides (C: Murlough NNR, Co. Down, Northern Ireland, voucher DNA2899, D: Mount Stewart, Co. Down, Northern Ireland, voucher DNA2898). Scale bar 0.1 mm.