Extended Data Fig. 1: Virtual development of teeth on an ischnacanthid acanthodian jawbone.
From: Acanthodian dental development and the origin of gnathostome dentitions
Tooth rows of NRM-PZ P. 9449 Early Devonian, Canada. Labelled sclerochronology of the lateral row (a), lingual row (b) and overgrowth of the initial teeth at the centre of ossification (c). Colours of the nested boxes reflect the successive stages of tooth development. Scale bar represents 169 µm in a, b, and 72 µm in (c).
