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Text
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URL Address
<a href="http://doi.org/10.1671/0272-4634(2001)021%5B0098:somehm%5D2.0.co;2" target="_blank" rel="noreferrer noopener">http://doi.org/10.1671/0272-4634(2001)021%5B0098:somehm%5D2.0.co;2</a>
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Pages
98-106
Issue
1
Volume
21
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Title
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Skull of Megalohyrax eocaenus (Hyracoidea, Mammalia) from the Oligocene of Egypt
Publisher
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Journal of Vertebrate Paleontology
Date
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2001
2001-03
Subject
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age; eocene; eutherian mammals; evolution; fayum; order; Paleontology; phylogeny; tree
Creator
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Thewissen J G M; Simons E L
Description
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The cranial anatomy of Megalohyrax eoceanus Andrews, 1903, a pliohyracid (Hyracoidea, Mammalia) from Oligocene levels of the Jebel Qatrani Formation of the Fayum Depression in Egypt, is described. Megalohyrax is the largest of the Fayum hyracoids, its skull is 391 mm long and the specimen described here is probably the best-preserved pliohyacid skull known. Megalohyrax has a strong lambdoid crest, a primitive alisphenoid canal, a notch for the minor palatine neurovascular group, orbits which are not anteriorly displaced, and a broad contact between the maxilla and frontal. In all of these features, Megalohyrax differs from modem hyracoids. Contrary to previous suggestions, the dental formula of Megalohyrax is 3.1.4.3, not similar to early sirenians (which have 5 premolars). Basioccipital morphology suggests that Megalohyrax may have had a eustachian sac.
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<a href="http://doi.org/10.1671/0272-4634(2001)021%5B0098:somehm%5D2.0.co;2" target="_blank" rel="noreferrer noopener">10.1671/0272-4634(2001)021%5B0098:somehm%5D2.0.co;2</a>
Format
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Journal Article
2001
Age
eocene
eutherian mammals
Evolution
fayum
Journal Article
Journal of Vertebrate Paleontology
order
Paleontology
Phylogeny
Simons E L
Thewissen J G M
tree