Crassitoniella carinata is a species of marine gastropod mollusc in the family Eatoniellidae.

Crassitoniella carinata has a distinctive orange-red coloured shell, with a wide protoconch.

The living animal has white long tentacles, with large eyes.

[1] The holotype was collected from shell sand found at Piwhane / Spirits Bay in the Northland Region, New Zealand.

[5] Additional specimens have been found in the waters near Manawatāwhi / Three Kings Islands.