Trilobita - Agnostida - Agnostidae

Full reference: R. A. Robison and J. Pantoja-Alor. 1968. Tremadocian trilobites from the Nochixtlan Region, Oaxaca, Mexico. Journal of Paleontology 42(3):767-800

Belongs to Gymnagnostus according to R. A. Robison and J. Pantoja-Alor 1968

Sister taxon: Gymnagnostus mexicanus

Type specimen: USNM 158892, a pygidium. Its type locality is USNM 16002b, Tinu Formation, Oaxaca, Mexico - Robison and Pantoja-Alor 1968, which is in the Tremadoc of limestone/shale the Tinu Formation Mexico.

Ecology: slow-moving nektonic suspension feeder