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Fig. 10 Types of vertebrae. (a and a′) aspondylous, (b and b′) monospondylous, (c, c′, c″ and d, d′) diplospondylous with different size and shape (C″ = wedge-shaped vertebrae, hemicentra), (e and e′) Rhizoprionodon's phenotype. Adapted from von Zittel et al. (1911), Šecérov (1911), Schaeffer (1967), Arratia et al. (2001), Peskin et al. (2020) and from Maisey personal communication.
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Full text @ J. Anat.