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Article: Tooth replacement in Manidens condorensis: baseline study to address the replacement pattern in dentitions of early ornithischians

Papers in Palaeontology - Volume 7 Issue 1 - Cover
Publication: Papers in Palaeontology
Volume: 7
Part: 2
Publication Date: May 2021
Page(s): 1167 1193
Author(s): Marcos G. Becerra, Diego Pol, John A. Whitlock, and Laura B. Porro
DOI: 10.1002/spp2.1337
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How to Cite

BECERRA, M.G., POL, D., WHITLOCK, J.A., PORRO, L.B. 2021. . Papers in Palaeontology, 7, 2, 1167-1193. DOI: /doi/10.1002/spp2.1337

Author Information

  • Marcos G. Becerra - Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Museo Paleontológico Egidio Feruglio Fontana 140 Trelew Chubut U9100GYO Argentina
  • Diego Pol - Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Museo Paleontológico Egidio Feruglio Fontana 140 Trelew Chubut U9100GYO Argentina
  • John A. Whitlock - Biology Department Mount Aloysius College Admiral Peary Highway 7373 Cresson PA 16630 USA
  • John A. Whitlock - Section of Vertebrate Paleontology Carnegie Museum of Natural History 4400 Forbes Avenue Pittsburgh PA 15213 USA
  • Laura B. Porro - Centre for Integrative Anatomy Department of Cell & Developmental Biology University College London Gower Street London WC1E 6BT UK

Publication History

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    Dental replacement in Heterodontosauridae has been debated over the last five decades primarily on indirect evidence, such as the development of wear facets and the position of erupted teeth. Direct observation of unerupted teeth provides unambiguous data for understanding tooth replacement but this has been done only for Heterodontosaurus and Fruitadens. This study addresses dental replacement in Manidens condorensis based on the positioning of functional and replacement teeth using microcomputed tomography data, differential wear along the dentition and the differences in labiolingual/apicobasal level of functional teeth. Dental replacement in Manidens condorensis was continuous in an anterior-to-posterior wave pattern, with asynchronous tooth eruption and the addition of new teeth posteriorly to the toothrow during ontogeny. Manidens shows the first evidence of dental replacement for the large dentary caniniform in Heterodontosauridae, which possibly had replacement timing distinct from the cheek dentition. Newly erupted teeth imbricate in a mesial cavity–distal crown base relationship during eruption, so that imbrication of the midposterior dentition remains unaltered during tooth replacement. The presence/absence of a small caniniform tooth in the D3 position of several specimens suggests possible intraspecific dimorphism in Manidens. On longitudinal sections of isolated crowns the histological features such as Howship's lacunae and odontoclast spaces are similar in size to extant reptiles. The differential wear decreasing posteriorly and hypothetical Z-spacing below 2.3 in Manidens are similar to basal ornithischians. Tooth replacement in Heterodontosauridae (and other early ornithischians) provides key information for understanding the dynamics of jaw function and craniomandibular specialization to herbivory.

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