Children (20 direct children, 20 direct and indirect children):
Harpoceras pantanellii
Harpoceras falciferum
Harpoceras subexaratum
Harpoceras subplanatum
Harpoceras falciferoides
Harpoceras nitescens
Harpoceras serpentinum
Harpoceras concinnum
Harpoceras falcula
Harpoceras soloniacense
Harpoceras eseri
Harpoceras strangewaysi
Harpoceras pseudoserpentinum
Harpoceras schroederi
Harpoceras lassum
Harpoceras mediterraneum
Harpoceras kopiki
Harpoceras kisslingi
Harpoceras rulleaui
Harpoceras fellenbergi