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, Riocerida, Slemmestadoceras, Orthoceras celticum, Orthoceras triadicum, Orthoceras nodosum, Orthoceras pulchellum, Pseudorthocerida, Orthoceras spitiense, Orthoceras pulchristriatum, Orthoceras rotundulum, Orthoceras baconicum, Orthoceras styriacum, Orthoceras lennaense, Orthoceras blakei, Orthoceras shastense, Orthoceras subtiliseptatum, Orthoceras multilabiatum, Orthoceras variestriatum, Orthoceras indoaustralicum, Orthoceras billiemense, Orthoceras lateseptatum, Orthoceras acum, Orthoceras mojsisovicsi, Orthoceras increscens, Orthoceras sandlingense, Orthoceras austriacum, Orthoceras subellipticum
Subtaxa: Protobactrites
Type: Protobactrites
Ecology: fast-moving nektonic carnivore
Distribution: