The relationship between the number, position and orientation of lithospheric plates and marine biogeographic provinciality may be estimated quantitatively since the spatial distribution of organisms is primarily controlled by latitude-related temperature gradients and geographical barriers. This paper modifies Schopfs (1976) model for quantitatively estimating shallow marine provinciality in recognition of latitude-related temperature gradients as the primary biogeographical factor. A test of the modified model against modern marine zoogeography reveals high consistency between them. Using this modified model and the Permian palaeogeographical reconstruction maps of Scotese and McKerrow (1990) , fifteen shallow benthic marine provinces were estimated to be Early and Late Permian in age respectively. A comparison of the estimated Permian marine provinciality with previously recognised empirical provincial patterns reveals a high degree of congruity, which may imply that there existed moderate to high latitudinal thermal gradients during the Permian, a level probably similar to that of the present world.