Earliest evidence of bone lesion in a metatherian

Although metatherians are known since Early Cretaceous, there is little evidence of bone lesions in this extremely diverse mammalian clade. Here, we report an asymptomatic and benign condition named torus mandibularis in an incomplete right dentary assigned to Patene simpsoni, a basal sparassodont f...

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Bibliographic Details
Published in:Historical biology 2021-10, Vol.33 (10), p.2486-2490
Main Authors: da Costa, Isadora, Bergqvist, Lílian Paglarelli, Rangel, Caio César, Barbosa, Fernando Henrique de Souza
Format: Article
Language:English
Subjects:
Bone lesions
Brazil
Cretaceous
Eocene
Itaboraí Basin
Lesions
Palaeogene
Patene simpsoni
sparassodont
torus mandibularis
Toruses
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Summary:Although metatherians are known since Early Cretaceous, there is little evidence of bone lesions in this extremely diverse mammalian clade. Here, we report an asymptomatic and benign condition named torus mandibularis in an incomplete right dentary assigned to Patene simpsoni, a basal sparassodont from the early Eocene of São José de Itaboraí Basin, Brazil. This report represents the oldest evidence of bone lesion in a Metatheria, as well as the first occurrence of torus mandibularis in a nonhuman fossil. The proposed diagnosis was based on location and external appearance of the bone overgrowth.
ISSN:0891-2963
1029-2381
DOI:10.1080/08912963.2020.1802446