†Hysteroceras subbinum Spath 1934 (ammonite)
Cephalopoda - Ammonitida - Brancoceratidae
Full reference: L. F. Spath. 1934. Ammonoidea of the Gault. Part XI. Paleontographical Society, London 86 (1932)(390):443-496
Belongs to Hysteroceras according to O. Renz 1982
Sister taxa: Hysteroceras andinum, Hysteroceras antipodeum, Hysteroceras binum, Hysteroceras bucklandi, Hysteroceras carinatum, Hysteroceras choffati, Hysteroceras falcicostatum, Hysteroceras intermedium, Hysteroceras orbignyi, Hysteroceras propinquum, Hysteroceras semileve, Hysteroceras varicosum, Petinoceras recuperator, Askoloboceras fastigatum, Terascosceras cariniferum, Komeceras acuticostatum
Ecology: fast-moving nektonic carnivore