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. 2000 Apr 4;97(8):4082–4085. doi: 10.1073/pnas.050589497

Figure 3.

Figure 3

A latitudinal gradient of the number of coexisting species in the gastropod family Turridae from the eastern North Atlantic and Norwegian Sea (19, 21). The number of species is estimated as the number of species ranges that span 3° intervals of latitude.