New records of Solenodendron (Rugosa) in Ireland and their stratigraphic and phylogenetic significance.

New records of Solenodendron hibernicum are described from the Chadian of Counties Clare and Donegal, the oldest records of this genus in Ireland. (The term ‘Chadian’ is used herein rather than the ‘Lower Vise´an’ preferred by some authors for this part of the Irish Vise´an succession.) Solenodendron is referred to the family Aulinidae Hill, 1981, which is elevated herein from subfamilial level. A continuous phylogeny of Solenodendron is proposed from the Courceyan to the Brigantian Substage.