Comparison of allopatric speciation events by mode across Devonian, Early Paleozoic, and modern clades.

Schizophoria (Schizophoria) and Floweria are brachiopod clades, data from [28]Leptodesma (Leiopteria) is a bivalve clade, data from [27]. The subclass Archaeostraca is a phyllocarid crustacean clade, data from [29]. Early Paleozoic Trilobites comparison based on [23]–[26]; Middle Devonian trilobites based on [22] Modern comparison based on [20]. Devonian clades exhibit a dramatic reduction in speciation by vicariance when compared to the modern or other fossil taxa.