Figure 5.

Reconstructing ancestral states of hypermineralized tissues

(A–D) Ancestral state reconstruction of the presence of hypermineralized tissues in the dental (A and B) and dermal (C and D) skeletons for trees, in which the GAP clade is resolved through unconstrained analysis to a stem-sarcopterygian affinity (A and C), or constrained to a stem-osteichthyan affinity (B and D). Diamonds at nodes express probability of the presence of a specific hypermineralized tissue, with the proportion of the color fill reflecting probability. The crown-chondrichthyans (Chond.), crown-actinopterygians (Actinop.), and crown-sarcopterygians (Sarcop.) are shown as triangles, and important stem taxa by bars (e.g., Meemannia). Tables S2 and S3 show data used to construct these trees.