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The isocrinine crinoid Isselicrinus Rovereto from the Paleogene of the Americas

  • Stephen K. DonovanEmail author
  • Sven N. Nielsen
  • J. Velez-Juarbe
  • Roger W. Portell
Regular Research Article

Abstract

Crinoids are uncommon fossils in the Cenozoic. This scarcity means that even disarticulated elements are of note. Two species of the isocrinine Isselicrinus Rovereto are described from their disarticulated columns. Isselicrinus sp. A is from the upper Eocene Moritzian Stage of Tierra del Fuego. These crinoids have a robust column, varying from pentalobate (proximal?) to rounded pentagonal (distal?) in section and with consistently depressed areola petals. Isselicrinus sp. B is from the Lower Oligocene Juana Diaz Formation of Puerto Rico. This species is typified by slender pluricolumnals, always rounded pentagonal in section, and long noditaxes. Proximal and distal pluricolumnal morphologies are not distinguishable.

Keywords

Tierra del Fuego Puerto Rico Oligocene Systematics Taphonomy 

Notes

Acknowledgements

Two anonymous reviewers made several constructive comments, which we gratefully acknowledge. We thank Sean Roberts (UF) for assistance in drafting Fig. 1. This is University of Florida Contribution to Paleobiology 861.

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Copyright information

© Akademie der Naturwissenschaften Schweiz (SCNAT) 2019

Authors and Affiliations

  • Stephen K. Donovan
    • 1
    Email author
  • Sven N. Nielsen
    • 2
  • J. Velez-Juarbe
    • 3
  • Roger W. Portell
    • 4
  1. 1.Taxonomy and Systematics GroupNaturalis Biodiversity CenterLeidenThe Netherlands
  2. 2.Instituto de Ciencias de la TierraUniversidad Austral de ChileValdiviaChile
  3. 3.Natural History Museum of Los Angeles CountyLos AngelesUSA
  4. 4.Florida Museum of Natural HistoryUniversity of FloridaGainesvilleUSA

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