Children (48 direct children, 114 direct and indirect children):
Baltoceratidae
(tree size 16)
Choanoceratidae
Clinoceratidae
Cryptocycloceras
Cycloceras
Dawsonoceratidae
(tree size 1)
Donacoceras
Engorthoceratidae
Garryoceras
Geisonoceratidae
(tree size 5)
Hemicosmorthoceras
Geisonocerina
Jangziceras
Kionoceratidae
(tree size 6)
Lamellorthoceratidae
Leurocycloceras
Mericoceras
Murchisoniceras
Narthecoceratidae
Neosichuanoceras
Orthocerataceae
(tree size 1)
Orthoceratidae
(tree size 16)
Orthocycloceras
Paradnatoceras
Paraphragmitidae
(tree size 6)
Proteoceratidae
(tree size 2)
Protobactrites
Pseudorthocerataceae
Pseudotemperoceras
Rhabdites
Richmondoceras
Sactorthoceratidae
(tree size 4)
Siberioceras
Sinoceratidae
Sphaerorthoceratidae
(tree size 1)
Stereoplasmoceratidae
(tree size 1)
Tienoceras
Tretoceras
Trispectes
Troedssonellidae
(tree size 2)
Vericeras
Joldagiroceras
Loxoceras
Brachycycloceratidae
(tree size 3)
Michelinoceratidae
(tree size 1)
Arionoceratidae
(tree size 1)
Chicagooceras
Sichuanoceratidae
Sphaerortoceratidae