| |
| American Hyracotherium (Perissodactyla, Equidae). Bulletin of the AMNH ; v. 110, article 1 |
| |||||||||||
| Download Problems | |
| Title: | American Hyracotherium (Perissodactyla, Equidae). Bulletin of the AMNH ; v. 110, article 1 |
| Authors: | Kitts, David B. |
| Issue Date: | 1956 |
| Publisher: | New York : [American Museum of Natural History] |
| Series/Report no.: | Bulletin of the American Museum of Natural History ; v. 110, article 1 |
| Abstract: | "The teeth of Hyracotherium are in most respects quite primitive. They do, however, possess well-developed lophs and lophids, and in one species there is a definite tendency towards the molarization of P[superscript 3]. Although the teeth of Hyracotherium are in most respects more primitive than those of the phenacodontids, the possession of a mesostyle excludes all phenacodontid genera except Desmatoclaenus from the ancestry of Hyracotherium. The skull of Hyracotherium is not strikingly similar to the skulls of later horses. The orbit is relatively more posteriorly located than it is in any of the condylarths, and in the arrangement and relationship of the skull bones Hyracotherium closely resembles Mesohippus. The lumbar neural spines are almost vertical, indicating a relative unimportance of the longissimus muscle. Some of the lumbar zygopophyses were apparently embracing. In these characters Hyracotherium resembles the later horses. It is probable that the lumbar series was relativ... |
| Description: | 60 p., 7 p. of plates : ill. ; 28 cm. Thesis (Ph. D.)--Columbia University. Includes bibliographical references (p. 58-60). |
| URI: | http://hdl.handle.net/2246/430 |
| Department of Library Services
American Museum of Natural History Central Park West at 79th St., New York, NY 10024 © American Museum of Natural History, 2006 Powered by DSpace
|
||