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27 February 2019 Two new Paleozoic Asteroidea (Echinodermata) and their taxonomic and evolutionary significance
Daniel B. Blake, Joseph Koniecki
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Sertulaster keslingi new genus new species (Palaeasteridae) and Delicaster hotchkissi new species (Permasteridae) are asteroid echinoderms described, respectively, from the Ordovician and Carboniferous of eastern North America. The new genus and species help to document diversity within taxa of lower rank. S. keslingi is similar to the Early Ordovician EriasterBlake and Guensburg, 2005 but exhibits less differentiation of the skeletal elements from beyond the ambulacral column, that of the so-called extraxial skeleton, whereas the comparatively robust construction of Delicaster hotchkissi clearly departs from that of the type species, D. enigmaticus (Kesling, 1967). Small sample sizes and incomplete exposure of available specimens illustrate ambiguities typically encountered in the study of fossil asteroids.

© 2018, The Paleontological Society This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (, which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Daniel B. Blake and Joseph Koniecki "Two new Paleozoic Asteroidea (Echinodermata) and their taxonomic and evolutionary significance," Journal of Paleontology 93(1), 105-114, (27 February 2019).
Accepted: 28 July 2018; Published: 27 February 2019
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