Glirodon fossil map
Where fossils of Glirodon have been found, shown on the Earth as it looked about 145 million years ago and on today’s map.
Dots are fossil collections recorded in the Paleobiology Database. The “then” view moves today’s fossil sites back to their positions 145 million years ago (the time slice nearest the median age of the fossils) using the Merdith et al. (2021) plate model; positions are approximate. Open on the timeline map →
| Group | Early mammals |
|---|---|
| Lived | 154.8–143.1 million years ago (Kimmeridgian to Tithonian) |
| Periods | Jurassic |
| Named by | Engelmann and Callison 1999 |
| Fossil records | 8 occurrences at 3 locations (PBDB) |
| Found in | United States |
| Rock formations | Morrison |
About Glirodon
Glirodon is a genus of extinct mammal from the Upper Jurassic. It was a relatively early member of the also-extinct order of Multituberculata, suborder "Plagiaulacida". These mammals lived in North America during the Mesozoic, also known as the "age of the dinosaurs".
The genus Glirodon has been described by Engelmann G.F. and Callison G. (1999) from a 'gliriform tooth'.
The species Glirodon grandis, also described by Engelmann and Callison, has been found in the Upper Jurassic formations of Dinosaur National Monument in Utah (United States). Other than being a large, early American Multituberculate, (see Multituberculata), the nature of this beast is somewhat unclear. It is an "allodontid (two families and the genus Glirodon)", (Kielan-Jaworowska and Hurum, 2001). It had gliriform incisors; incisors with the "enamel reduced to a stripe on the front side." Apparently, this condition evolved several times among Multituberculates.
Text in “About” is quoted from the Wikipedia article Glirodon (revision 1283168340), licensed under CC BY-SA 4.0; introduction excerpted verbatim, formatting removed. Ages, family, authority and fossil records: Paleobiology Database, accessed 23 October 2026. Ages are those of the rock layers the fossils were found in. Wikidata: Q612635.
