Extended Data Figure 5: SEM images of C. kroegeri sclerites and radula.
From: Ancestral morphology of crown-group molluscs revealed by a new Ordovician stem aculiferan
a, YPM 530836 indicating regions of photomicrographs b–e. b, Left major cusps and adjacent uncinal teeth. c, Left uncinal region. d, Overview showing median teeth (a single tooth indicated by the white arrow), broad flanking region with lateral teeth (a single tooth indicated by the black arrow) and major cusps. e, Right uncinal teeth. f, YPM 237255 indicating regions of SEM photomicrographs g–i. g, Sclerites with diagenetic infill white arrows. h, Sclerites in longitudinal section. i, Sclerite in longitudinal section preserved as a void. b–h and g–i were taken using backscatter and secondary electron imaging, respectively.
