A taxonomic reassessment of Ichthyosaurus communis and I. intermedius and a revised diagnosis for the genus

@article{Massare2018ATR,
  title={A taxonomic reassessment of Ichthyosaurus communis and I. intermedius and a revised diagnosis for the genus},
  author={Judy A. Massare and Dean R. Lomax},
  journal={Journal of Systematic Palaeontology},
  year={2018},
  volume={16},
  pages={263 - 277}
}
Ichthyosaurus communis De la Beche & Conybeare, 1821 and I. intermedius Conybeare, 1822 have been considered synonymous by some researchers, but distinct species by others. The distinction between the two species was originally based on tooth morphology, which has been shown to vary ontogenetically as well as within an individual. Subsequent literature of the nineteenth century did not propose adequate diagnostic features to distinguish the two species. In addition, illustrations suggest that… 
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It is the present intention to redeem the pledge of endeavouring to fill up the outlines of the facts which were offered, so far as the additional facts gathered in the researches of another year, the examination of many new and illustrative specimens, and my correspondence with scientific friends, have enabled me to do so.
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