Llandovery (Silurian) conodont provincialism: An update based on quantitative analysis

The conodont fauna showed a significant change in provincialism from the Ordovician to the Silurian, i.e., from a latitudinal pattern to a longitudinal pattern. The Hirnantian glaciation may be one of the controlling factors which resulted in the reorganization of the conodont faunas and the change of their living habits and ecological requirement.