Triproetus

 ( Carboniferous Trilobites ) 

Triroetus is a genus of proetidae trilobite found in Upper Carboniferous-aged marine strata in Russia, and Lower Permian-aged strata of Thailand, Malaysia, Spitzbergen, Yukon Territory, and Middle Permian-aged marine strata of Oman and Texas.D. K. Brezinski. 1992. Permian trilobites from west Texas. Journal of Paleontology 66(6):924-943 [1]