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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.

Description

Largest specimens of Trimerorhachis reached a length of about 1.5 meters (5 ft), although most have been no more than 1.2 meters (4 ft) in length. Trimerorhachis

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