Figure 1
From: Bivalve network reveals latitudinal selectivity gradient at the end-Cretaceous mass extinction
The biogeographic structure of bivalves reveals spatial organization above the species level.
Points correspond to fossil localities and are colored by BU. For visualization, ten-by-ten degree cells were colored by BU only if the cell contained fossil localities from a single BU and cells without fossil localities were colored if they were less than 15 degrees from a locality. Although some cells may have been uninhabitable by marine bivalves, they were colored if they met the above criteria. Grids are only for visual aid and were not included in any way in subsequent analysis.
