 Otherwise, the carapace has the usual complement of four costals, five vertebrals and 12 marginals (per side).Internally, the carapace is made of eight pleurals (per side), 11 peripherals (per side), a nuchal at the front and a suprapygal and pygal at the rear of the shell.As noted earlier, neurals, although always present, often exist as subsurface elements above the vertebral column.The plastron of chelids does not contain any hinges as can appear in some cryptodire turtles.