Skull of Megalohyrax eocaenus (Hyracoidea, Mammalia) from the Oligocene of Egypt

Title

Skull of Megalohyrax eocaenus (Hyracoidea, Mammalia) from the Oligocene of Egypt

Creator

Thewissen J G M; Simons E L

Publisher

Journal of Vertebrate Paleontology

Date

2001
2001-03

Description

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.

Subject

age; eocene; eutherian mammals; evolution; fayum; order; Paleontology; phylogeny; tree

Format

Journal Article

Search for Full-text

Users with a NEOMED Library login can search for full-text journal articles at the following url: https://libraryguides.neomed.edu/home

Rights

Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).

Pages

98-106

Issue

1

Volume

21

Citation

Thewissen J G M; Simons E L, “Skull of Megalohyrax eocaenus (Hyracoidea, Mammalia) from the Oligocene of Egypt,” NEOMED Bibliography Database, accessed May 9, 2021, https://neomed.omeka.net/items/show/7338.

Social Bookmarking