Our analyses support a clear trend among all sharks of the same order to show similar histological patterns; the only known exceptions are orectolobiform sharks, the frilled shark Chlamydoselachus [orthodont rather than pseudoosteodont (Goto & Hashimoto, 1976 )], the snaggletooth shark Hemipristis [pseudoosteodont instead of orthodont (Compagno, 1988 ; Jambura et al. 2018 )], and the basking shark Cetorhinus [pseudoosteodont instead of osteodont (Jambura et al. 2019 )].
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Evolutionary trajectories of tooth histology patterns in modern sharks (Chondrichthyes, Elasmobranchii).
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