ON THE TYPE OF SCHISMOTHERIUM FRACTUM AMEGHINO, 1887 (XENARTHRA, FOLIVORA, MEGATHERIOIDEA) FROM THE EARLY MIOCENE SANTA CRUZ FORMATION (SANTA CRUZ PROVINCE, ARGENTINA)

Authors

  • Augusto Racco CONICET-Sección Paleontología de Vertebrados. Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”.
  • Juan Carlos Fernicola CONICET-Sección Paleontología de Vertebrados. Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”. Universidad Nacional de Luján, Departamento de Ciencias Básicas
  • María Susana Bargo Comisión de Investigaciones Científicas de la Provincia de Buenos Aires (CIC).
  • Sergio Fabián Vizcaíno Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET).
  • Gerardo De Iuliis University of Toronto

Keywords:

Schismotherium, Sloths, Neotype, Taxonomy, Santacrucian, Patagonia

Abstract

Schismotherium fractum, the type species for the genus, is a basal Megatherioidea (Xenarthra, Folivora) from the Santa Cruz Formation (Early Miocene) of Patagonia. The type specimen, currently lost, was described as a fragmented left mandible. Several years later, Ameghino refined his description based on additional material that included the skull and mandible, and several postcranial elements, all deposited in the Museo Argentino de Ciencias Naturales “Bernardino Rivadavia” (Buenos Aires, Argentina; MACN-A 6445-70). A neotype for this species is required to permit further systematic and taxonomic work on several sloth taxa, and we designate MACN-A 6445-70 as neotype for Schismotherium fractum.

Author Biographies

  • Augusto Racco, CONICET-Sección Paleontología de Vertebrados. Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”.
    División de Paleontología de Vertebrados
  • Juan Carlos Fernicola, CONICET-Sección Paleontología de Vertebrados. Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”. Universidad Nacional de Luján, Departamento de Ciencias Básicas
    División de Paleontología de Vertebrados
  • María Susana Bargo, Comisión de Investigaciones Científicas de la Provincia de Buenos Aires (CIC).
    División Paleontología Vertebrados, Unidades de Investigación, Anexo Museo, Facultad de Ciencias Naturales y Museo
  • Sergio Fabián Vizcaíno, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET).
    División Paleontología Vertebrados, Unidades de Investigación, Anexo Museo, Facultad de Ciencias Naturales y Museo
  • Gerardo De Iuliis, University of Toronto
    Department of Ecology and Evolutionary Biology

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Published

2018-02-21

Issue

Vol. 55 No. 1 (2018)

Section

Paleontological Notes

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How to Cite

ON THE TYPE OF SCHISMOTHERIUM FRACTUM AMEGHINO, 1887 (XENARTHRA, FOLIVORA, MEGATHERIOIDEA) FROM THE EARLY MIOCENE SANTA CRUZ FORMATION (SANTA CRUZ PROVINCE, ARGENTINA). (2018). Ameghiniana, 55(1), 117-125. https://ameghiniana.org.ar/index.php/ameghiniana/article/view/3109

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