- Permian Age
- Ryan Formation
- Jefferson County, Oklahoma
- Specimen measures approx. 1/2″ long and will come in the 1.25″ Gem Jar as Shown
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 Texas. 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.