Trimerorhachis fossil map
Where fossils of Trimerorhachis have been found, shown on the Earth as it looked about 275 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 275 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 tetrapods & amphibians |
|---|---|
| Lived | 303.7–274.4 million years ago (Gzhelian to Kungurian) |
| Periods | Carboniferous, Permian |
| Family | Trimerorhachidae |
| Named by | Cope 1878 |
| Fossil records | 58 occurrences at 46 locations (PBDB) |
| Found in | United States |
| Rock formations | Vale, Arroyo, Belle Plains, Wellington, Abo, Admiral |
About Trimerorhachis
Trimerorhachis is an extinct genus of dvinosaurian temnospondyl within the family Trimerorhachidae. It is known from the Early Permian of the southwestern United States, with most fossil specimens having been found in the Texas Red Beds. The type species of Trimerorhachis, T. insignis, was named by American paleontologist Edward Drinker Cope in 1878. Cope named a second species from Texas, T. mesops, in 1896. The species T. rogersi (named in 1955) and T. greggi (named in 2013) are also from Texas, and the species T. sandovalensis (named in 1980) is from New Mexico.
Text in “About” is quoted from the Wikipedia article Trimerorhachis (revision 1355672227), 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: Q7842192.
