Diagram to illustrate relation between whole sequence of ossification of Salminus brasiliensis (from Mattox et al. 2014) and losses in the skeleton of Tucanoichthys tucano. Solid horizontal bars represent bone presence (fixed length). Error bars associated with solid horizontal bars indicate length at which a particular bone is present in some but not all individuals (minimum length). Black bars represent ossifications present and gray bars ossifications absent in Tucanoichthys. The black/grey bar represents the nasal in which intraspecific variation was found.