Figure 2.

Extent of the dermal outgrowths of the intercalar bone. (a) small dermal component without extensive outgrowths in ^†Ichthyokentema purbeckensis, reconstruction based on [90]: fig. 2; (b) dermal outgrowths contacting the prootic in Amia calva, reconstruction based on AMNH 90970 SD in [23]: fig. 23B; (c) extensive outgrowths contacting the prootic and parasphenoid in ^†Ionoscopus cyprinoides, reconstruction based on NHMUK PV 37795a in [78]: fig. 1A. Intercalar bone painted in red, parasphenoid painted in green. Abbreviations: boc, basioccipital; dpt, dermopterotic; exo, exoccipital; pro, prootic; sph, sphenotic.