Children (18 direct children, 18 direct and indirect children):
Eutrephoceras eyerdami
Eutrephoceras bellerophon
Eutrephoceras bouchardianum
Eutrephoceras campbelli
Eutrephoceras clementinum
Eutrephoceras darupense
Eutrephoceras dekayi
Eutrephoceras dietrichi
Eutrephoceras expansus
Eutrephoceras indicum
Eutrephoceras ovoideum
Eutrephoceras quadrilineatum
Eutrephoceras simile
Eutrephoceras sphaericum
Eutrephoceras sublaevigatum
Eutrephoceras uitenhagense
Eutrephoceras vastum
Eutrephoceras allani