Fossils ascribed to this genus are known from the Jurassic and Cretaceous periods.

Recently, the genus underwent a major revision and was split into two after the erection of Xampylodon to accommodate the species X. dentatus, X. loozi, and X.

[1] The genus is now known only from New Zealand, Antarctica, Africa, and South America.

[2] The earliest occurrences of attributed specimens are from the Tithonian of New Zealand, and the latest are from the Maastrichtian of Antarctica.

Later, N. antarcti was considered a nomen dubium and regarded as a junior synonym of Notidanodon pectinatus.