Chondrichthyes - Holocephali - Cochliodontidae

Full reference: L. Agassiz. 1838. Recherches Sur Les Poissons Fossiles. Tome III (livr. 11). Imprimérie de Petitpierre, Neuchatel 73-140

Parent taxon: Cochliodontidae according to A. S. Woodward 1889

Sister taxa: Cochliodus, Cyrtonodus, Deltodus, Diplacodus, Erismacanthus, Paecilodus, Pleuroplax, Poecilodus, Psephodus, Sandalodus, Streblodus, Tomodus, Xystrodus

Subtaxa: Helodus didymus, Helodus gibberulus, Helodus incisus, Helodus mammillaris, Helodus planus, Helodus rudis, Helodus rugosus, Helodus simplex, Helodus subpolitus, Helodus subteres, Helodus turgidus

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Ecology: nektonic carnivore