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1 January 2010 BIOMECHANICAL CHANGES AND REMODELING OF THE MASTICATORY APPARATUS DURING MAMMALIAN EVOLUTION: THE CASE OF THE ISSIODOROMYINAE (RODENTIA)
LIONEL HAUTIER, JULIEN CLAVEL, VINCENT LAZZARI, HELDER GOMES RODRIGUES, MONIQUE VIANEY-LIAUD
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Abstract

The direction of mastication revealed by dental microwear was studied in relation to changes in the structure of the masticatory apparatus in the Issiodoromyinae (Rodentia, Mammalia). Our results offer a rare opportunity to assess the order of establishment of the morphological characters that are related to the acquisition of propalinal mastication in an extinct lineage. Elfomys and Pseudoltinomys show cuspidate tooth crowns, a high mandibular condyle, and a significant lateromedial orientation of the masticatory muscles (superficial masseter and internal pterygoid) in association with oblique chewing movements. In contrast, the Issiodoromys lineage is characterized by a flat molar occlusal surface, a low mandibular condyle, and posterior orientation of the masseter and pterygoid associated with slightly oblique to propalinal chewing. We show that striking convergences with some members of Ctenohystrica have occurred in the evolution of the Issiodoromyinae.

LIONEL HAUTIER, JULIEN CLAVEL, VINCENT LAZZARI, HELDER GOMES RODRIGUES, and MONIQUE VIANEY-LIAUD "BIOMECHANICAL CHANGES AND REMODELING OF THE MASTICATORY APPARATUS DURING MAMMALIAN EVOLUTION: THE CASE OF THE ISSIODOROMYINAE (RODENTIA)," Palaios 25(1), 6-13, (1 January 2010). https://doi.org/10.2110/palo.2009.p09-047r
Accepted: 4 September 2009; Published: 1 January 2010
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