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Extraordinary diphyodonty-related change in dental function for a tooth of the extinct marsupialEkaltadeta ima(Propleopinae, Hypsiprymnodontidae)

Authors
Journal
Archives of Oral Biology
0003-9969
Publisher
Elsevier
Publication Date
Volume
40
Issue
7
Identifiers
DOI: 10.1016/0003-9969(95)00010-m
Keywords
  • Tooth Replacement
  • Ekaltadeta Ima
  • Diphyodonty
Disciplines
  • Biology

Abstract

Abstract A time-dependent, fundamental change in function for a sectorial tooth in a group of extinct, propleopine kangaroos is reported. In juvenile Ekaltadeta ima (Marsupialia, Hypsiprymnodontidae, Propleopinae) the second premolar (P 2) functions as a serrated blade at the anterior end of the cheek tooth row. In adults, this tooth drops far below the occlusal plane of the cheek tooth row where it assumes a completely different function, that of a buttress, anterolingual to the base of the crown of the much larger, newly erupted third premolar (P 3). This pattern of diphyodonty-related change in dental function is unique within Mammalia. It also represents an extraordinary example of biological recycling of a normally discarded tooth.

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