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Testing evolutionary dynamics on first lower molars of Pliocene Ogmodontomys (Arvicolidae, Rodentia) from the Meade Basin of southwestern Kansas (USA); a landmark-based approach

Federica Marcolini, Paolo Piras and Robert A. Martin
Testing evolutionary dynamics on first lower molars of Pliocene Ogmodontomys (Arvicolidae, Rodentia) from the Meade Basin of southwestern Kansas (USA); a landmark-based approach
Palaios (August 2009) 24 (8): 535-543

Abstract

Landmark- and semilandmark-based geometric morphometrics were used to explore morphological variation in the occlusal surface and linea sinuosa (enamel-dentine junction) of first lower molars (m1s) of Ogmodontomys sawrockensis and O. poaphagus from the Meade Basin in southwestern Kansas. Morphological differences between the two species were determined in an effort to explore interspecific variation and to test the power of landmark geometry of dental variation for species discrimination. Significant differences were found between O. sawrockensis and O. poaphagus in both occlusal surface and the linea sinuosa patterns. Multivariate tests demonstrate that the most significant morphological changes occurred at the presumed O. sawrockensis-O. poaphagus speciation event. An intraspecific multivariate analysis of O. poaphagus m1s, however, also identified directional evolutionary tendencies in shape of both the occlusal surface and linea sinuosa.


ISSN: 0883-1351
Serial Title: Palaios
Serial Volume: 24
Serial Issue: 8
Title: Testing evolutionary dynamics on first lower molars of Pliocene Ogmodontomys (Arvicolidae, Rodentia) from the Meade Basin of southwestern Kansas (USA); a landmark-based approach
Affiliation: Universita di Roma Tre, Dipartimento di Scienze Geologiche, Rome, Italy
Pages: 535-543
Published: 200908
Text Language: English
Publisher: Society for Sedimentary Geology, Tulsa, OK, United States
References: 59
Accession Number: 2009-086750
Categories: Vertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: NSF Grant EAR-0207582
Illustration Description: illus. incl. 5 tables, sketch map
N37°00'00" - N37°22'60", W101°04'60" - W100°04'60"
Secondary Affiliation: Murray State University, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by SEPM (Society for Sedimentary Geology), Tulsa, OK, United States
Update Code: 200947
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