Extended Data Fig. 2: Internal structure of Qianodus tooth whorls.
(a, g) Nomarski DIC optical microscopy and (b–f, h) volume renderings of synchrotron X-ray tomography datasets. (a) Longitudinal thin section through a whorl with partially preserved teeth IVPP V26653. (b) Longitudinal virtual slice through the progenitor tooth row of the holotype IVPP V26641. (c) Horizontal virtual slice through the holotype IVPP V26641 at the level of tooth. (d) Transverse virtual slice through a partially preserved whorl IVPP V26645. (e) Basal view of IVPP V26641 with highlighted compact tissue of the base. (f) Volume rendering of radiotransparent structures inside a tooth whorl fragment (IVPP V26646) shown in oral view. (g) Longitudinal thin section and (h) longitudinal virtual section through IVPP V26646. at, accessory teeth; ct, compact tissue; la, labial; li, lingual; p, tooth pulp; pt, primary teeth; st, spongiose tissue; stc, spongiose tissue canals; wbc, whorl base crest. Scale bars, 0.5 mm.
