In their recently published paper “Paleoecology of echinoderms in cold seep environments revealed by isotope analysis in the Late Cretaceous Western Interior Seaway” Kato et al. (2017) claimed to provide further evidence using isotope analysis that the stalked crinoid Lakotacrinus brezinaiHunter et al. 2016 from the U.S. Western Interior Seaway, which has a relatively unusual morphology for a post-Palaeozoic crinoid, was adapted to inhabiting a cold seep environment; however, they merely restate the interpretations of Hunter et al. (2016). We find that the evidence presented by Kato et al. (2017) is oversimplified and their interpretation is insufficiently supported...

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