“…Investigations on chondrocranial development are available for a growing number of vertebrate species including chondrichthyans (Gillis, Dann, & Shubin, 2009; Gillis, Modrell, & Baker, 2012), sturgeons (Gillis et al, 2012; Warth, Hilton, Naumann, Olsson, & Konstantinidis, 2017), teleosts (Langille & Hall, 1987), coelacanths (Dutel et al, 2019), anurans (Lukas & Olsson, 2018a; Parker, 1876, 1879; Stöhr, 1882), testudines (Kuratani, 1999; Tulenko & Sheil, 2007), and squamates (Hernández‐Jaimes, Jerez, & Ramírez‐Pinilla, 2012; Ollonen, da Silva, Mahlow, & Di‐Poï, 2018). Investigating the sequential development of cartilaginous elements in a variety of vertebrate species is essential for an understanding of evolutionary changes and for the identification of ontogenetic novelties as well as heterochronic events.…”