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URL Address
<a href="http://doi.org/10.1038/nature09061" target="_blank" rel="noreferrer noopener">http://doi.org/10.1038/nature09061</a>
Pages
748–751
Issue
7307
Volume
466
Dublin Core
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Title
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The evolution of mammal-like crocodyliforms in the Cretaceous Period of Gondwana.
Publisher
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Nature
Date
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2010
2010-08-05
Subject
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TANZANIA; ANIMAL classification; ANIMAL diversity; ANIMAL species; CRETACEOUS paleoecology; EVOLUTION (Biology); FOSSIL crocodylidae; TAXONOMY
Creator
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O'Connor Patrick M; Sertich Joseph J W; Stevens Nancy J; Roberts Eric M; Gottfried Michael D; Hieronymus Tobin L; Jinnah Zubair A; Ridgely Ryan; Ngasala Sifa E; Temba Jesuit
Description
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Fossil crocodyliforms discovered in recent years have revealed a level of morphological and ecological diversity not exhibited by extant members of the group. This diversity is particularly notable among taxa of the Cretaceous Period (144–65 million years ago) recovered from former Gondwanan landmasses. Here we report the discovery of a new species of Cretaceous notosuchian crocodyliform from the Rukwa Rift Basin of southwestern Tanzania. This small-bodied form deviates significantly from more typical crocodyliform craniodental morphologies, having a short, broad skull, robust lower jaw, and a dentition with relatively few teeth that nonetheless show marked heterodonty. The presence of morphologically complex, complementary upper and lower molariform teeth suggests a degree of crown–crown contact during jaw adduction that is unmatched among known crocodyliforms, paralleling the level of occlusal complexity seen in mammals and their extinct relatives. The presence of another small-bodied mammal-like crocodyliform in the Cretaceous of Gondwana indicates that notosuchians probably filled niches and inhabited ecomorphospace that were otherwise occupied by mammals on northern continents. [ABSTRACT FROM AUTHOR]
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<a href="http://doi.org/10.1038/nature09061" target="_blank" rel="noreferrer noopener">10.1038/nature09061</a>
Rights
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Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).
2010
ANIMAL classification
ANIMAL diversity
ANIMAL species
CRETACEOUS paleoecology
Department of Anatomy & Neurobiology
EVOLUTION (Biology)
FOSSIL crocodylidae
Gottfried Michael D
Hieronymus Tobin L
Jinnah Zubair A
Nature
NEOMED College of Medicine
Ngasala Sifa E
O'Connor Patrick M
Ridgely Ryan
Roberts Eric M
Sertich Joseph J W
Stevens Nancy J
TANZANIA
TAXONOMY
Temba Jesuit