Developmental Failure of Segmentation in a Caudal Vertebra of Apatosaurus (Sauropoda)

@article{Lovelace2014DevelopmentalFO,
  title={Developmental Failure of Segmentation in a Caudal Vertebra of Apatosaurus (Sauropoda)},
  author={David M. Lovelace},
  journal={The Anatomical Record},
  year={2014},
  volume={297}
}
  • D. Lovelace
  • Published 1 July 2014
  • Biology
  • The Anatomical Record
A vertebral element assigned to an Apatosaurus cf. ajax from the Late Jurassic Morrison Formation is described. The specimen exhibits an unusual morphology where two vertebrae are nearly seamlessly fused together, including the haemal arch that spans them. This morphology is thought be the result of a developmental abnormality. CT scans of the specimen reveal a thin zone of dorsoventral thickening between the two neural arches consistent with cortical bone. Contrast in internal morphology… 

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