Full reference: J. Y. Chen, G. W. Liu, and T. E. Chen. 1981. Silurian nautiloid faunas of central and southwestern China. Memoirs of the Nanjing Institute of Geology and Palaeontology 13:1-104
Parent taxon: Orthocerataceae according to J. Y. Chen et al. 1981
Sister taxa: Actinocerida, Dissidocerida, Lituitida, Offleyoceratidae, Orthocerida, Paraphragmitidae, Rioceratida, Slemmestadoceras, Orthoceras triadicum, Orthoceras rotundulum, Orthoceras mojsisovicsi, Orthoceras subtiliseptatum, Orthoceras blakei, Orthoceras variestriatum, Orthoceras pulchellum, Orthoceras austriacum, Orthoceras billiemense, Orthoceras acum, Orthoceras multilabiatum, Orthoceras subellipticum, Orthoceras lateseptatum, Orthoceras lennaense, Orthoceras sandlingense, Orthoceras baconicum, Orthoceras styriacum, Orthoceras indoaustralicum, Orthoceras shastense, Orthoceras celticum, Orthoceras increscens, Orthoceras pulchristriatum, Orthoceras nodosum, Orthoceras spitiense, Pseudorthocerida
Subtaxa: Protobactrites
Type: Protobactrites
Ecology: fast-moving nektonic carnivore
Distribution: