Children (17 direct children, 17 direct and indirect children):
Placenticeras whitfieldi
Placenticeras meeki
Placenticeras merenskyi
Placenticeras syrtale
Placenticeras placenta
Placenticeras vredenburgi
Placenticeras memoriaschloenbachi
Placenticeras tamulicum
Placenticeras mediasiaticum
Placenticeras pseudoplacenta
Placenticeras cumminsi
Placenticeras bidorsatum
Placenticeras kolbajense
Placenticeras grossouvrei
Placenticeras orbignyanum
Placenticeras intercalaris
Placenticeras unkwelanensis