Fig. 1. Stratigraphic distribution and trophic strategy of selected survivor and incoming nannoplankton taxa.

Important survivor taxa are indicated on the left, and incoming species are indicated on the right with an indication of principal trophic mode [based on our assessments, (24), Table 1, and table S1]: mixotrophs in blue and autotrophs in green. Bar thickness is a qualitative indication of abundance, with the broadest bars showing acme abundances. Dashed lines indicate dominantly coastal or neritic distributions. Close phylogenetic relationships are shown by arrows. The ancestry of Cruciplacolithus is uncertain but may lie with the Biscutaceae. The nannoplankton data are primarily from our work but are largely consistent with published sources. NP, nannofossil biozone.