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. 2021 Nov 10;8(11):210822. doi: 10.1098/rsos.210822

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© 2021 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 1. — Summary figure showing lower jaws of six chondrichthyans, and major structures discussed in the text. (a) The extant elasmobranch Isurus in medial view and with tooth series in lateral view, drawn from three-dimensional data [31]; (b) the stem-chondrichthyan Ptomacanthus in medial view reconstructed from [32] and with tooth whorl from [21]; (c) the ischnacanthid stem-chondrichthyan Erymnacanthus in medial view redrawn from [25]; (d) the acanthodid stem-chondrichthyan Acanthodes in lateral view redrawn from [33]; (e) the acanthodid stem-chondrichthyan Acanthodopsis in lateral view redrawn from [23]; (f) the diplacanthid stem-chondrichthyan Diplacanthus in medial view reconstructed from [61] and [28]. Not to scale.