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First cranial remains of a gondwanatherian mammal reveal remarkable mosaicism.

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Title: First cranial remains of a gondwanatherian mammal reveal remarkable mosaicism.
Authors: Krause, David W., Hoffmann, Simone, Groenke, Joseph R., Seiffert, Erik R., Andriamialison, Haingoson, Wible, John R., Kirk, E. Christopher, Kemp, Addison D., Schultz, Julia A., von Koenigswald, Wighart, Rossie, James B., O'Connor, Patrick M., Holloway, Waymon L., Dumont, Elizabeth R., Rogers, Raymond R., Rahantarisoa, Lydia J.
Source: Nature. 11/27/2014, Vol. 515 Issue 7528, p512-517. 6p.
Subjects: Radiation, Skull, Gondwana (Continent), Mosaic diseases, Cretaceous-Paleogene boundary, Mammals
Abstract: Previously known only from isolated teeth and lower jaw fragments recovered from the Cretaceous and Palaeogene of the Southern Hemisphere, the Gondwanatheria constitute the most poorly known of all major mammaliaform radiations. Here we report the discovery of the first skull material of a gondwanatherian, a complete and well-preserved cranium from Upper Cretaceous strata in Madagascar that we assign to a new genus and species. Phylogenetic analysis strongly supports its placement within Gondwanatheria, which are recognized as monophyletic and closely related to multituberculates, an evolutionarily successful clade of Mesozoic mammals known almost exclusively from the Northern Hemisphere. The new taxon is the largest known mammaliaform from the Mesozoic of Gondwana. Its craniofacial anatomy reveals that it was herbivorous, large-eyed and agile, with well-developed high-frequency hearing and a keen sense of smell. The cranium exhibits a mosaic of primitive and derived features, the disparity of which is extreme and probably reflective of a long evolutionary history in geographic isolation. [ABSTRACT FROM AUTHOR]
Copyright of Nature is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: <searchLink fieldCode="AR" term="%22Krause%2C+David+W%2E%22">Krause, David W.</searchLink><br /><searchLink fieldCode="AR" term="%22Hoffmann%2C+Simone%22">Hoffmann, Simone</searchLink><br /><searchLink fieldCode="AR" term="%22Groenke%2C+Joseph+R%2E%22">Groenke, Joseph R.</searchLink><br /><searchLink fieldCode="AR" term="%22Seiffert%2C+Erik+R%2E%22">Seiffert, Erik R.</searchLink><br /><searchLink fieldCode="AR" term="%22Andriamialison%2C+Haingoson%22">Andriamialison, Haingoson</searchLink><br /><searchLink fieldCode="AR" term="%22Wible%2C+John+R%2E%22">Wible, John R.</searchLink><br /><searchLink fieldCode="AR" term="%22Kirk%2C+E%2E+Christopher%22">Kirk, E. Christopher</searchLink><br /><searchLink fieldCode="AR" term="%22Kemp%2C+Addison+D%2E%22">Kemp, Addison D.</searchLink><br /><searchLink fieldCode="AR" term="%22Schultz%2C+Julia+A%2E%22">Schultz, Julia A.</searchLink><br /><searchLink fieldCode="AR" term="%22von+Koenigswald%2C+Wighart%22">von Koenigswald, Wighart</searchLink><br /><searchLink fieldCode="AR" term="%22Rossie%2C+James+B%2E%22">Rossie, James B.</searchLink><br /><searchLink fieldCode="AR" term="%22O'Connor%2C+Patrick+M%2E%22">O'Connor, Patrick M.</searchLink><br /><searchLink fieldCode="AR" term="%22Holloway%2C+Waymon+L%2E%22">Holloway, Waymon L.</searchLink><br /><searchLink fieldCode="AR" term="%22Dumont%2C+Elizabeth+R%2E%22">Dumont, Elizabeth R.</searchLink><br /><searchLink fieldCode="AR" term="%22Rogers%2C+Raymond+R%2E%22">Rogers, Raymond R.</searchLink><br /><searchLink fieldCode="AR" term="%22Rahantarisoa%2C+Lydia+J%2E%22">Rahantarisoa, Lydia J.</searchLink>
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  Data: Previously known only from isolated teeth and lower jaw fragments recovered from the Cretaceous and Palaeogene of the Southern Hemisphere, the Gondwanatheria constitute the most poorly known of all major mammaliaform radiations. Here we report the discovery of the first skull material of a gondwanatherian, a complete and well-preserved cranium from Upper Cretaceous strata in Madagascar that we assign to a new genus and species. Phylogenetic analysis strongly supports its placement within Gondwanatheria, which are recognized as monophyletic and closely related to multituberculates, an evolutionarily successful clade of Mesozoic mammals known almost exclusively from the Northern Hemisphere. The new taxon is the largest known mammaliaform from the Mesozoic of Gondwana. Its craniofacial anatomy reveals that it was herbivorous, large-eyed and agile, with well-developed high-frequency hearing and a keen sense of smell. The cranium exhibits a mosaic of primitive and derived features, the disparity of which is extreme and probably reflective of a long evolutionary history in geographic isolation. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Nature is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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