Mammalia - Theriiformes - Arctocyonidae

Alternative combinations: Desmatoclaenus spiekeri, Protogonodon spiekeri

Synonyms: Loxolophus biathales Gazin 1941, Protogonodon biathales Gazin 1941

Belongs to Loxolophus according to T. E. Williamson 1996

Sister taxa: Loxolophus criswelli, Loxolophus faulkneri, Loxolophus grangeri, Loxolophus hyattianus, Loxolophus kimbetovius, Loxolophus pentacus, Loxolophus priscus, Loxolophus schizophrenus, Loxolophus stenognathus

Type specimens:

• Loxolophus spiekeri: Its type locality is Dragon Canyon, which is in a Torrejonian terrestrial horizon in the North Horn Formation of Utah
• Protogonodon biathales:

Average measurements (in mm): m1 10.0 x 8.0