Identifying anagenesis and cladogenesis in the fossil record

Strotz and Allen (1) examined our recently published phylogeny of Cenozoic macroperforate planktonic foraminifera (2) to assess the relative frequency of anagenesis (evolution within a single evolving lineage) and cladogenesis (lineage branching) in the production of new morphospecies. They conclude that anagenesis is much less prevalent than indicated in our phylogeny.