Extended Data Figure 4: Additional specimens of C. kroegeri and Calvapilosa sp.
From: Ancestral morphology of crown-group molluscs revealed by a new Ordovician stem aculiferan
a, Part of YPM 530837, isolated head valve with radula preserved. b, Counterpart of YPM 530837, mirrored. c, Part of YPM 530836, isolated head valve with radula preserved. d, Counterpart of YPM 530836, mirrored. e, Part of YPM 530835, isolated head valve. f, Counterpart of YPM 530835, mirrored. g, Part of YPM 227641, Calvapilosa ?kroegeri, isolated head valve. h, Counterpart of YPM 227641, mirrored.
