Acanthometron = Spine proportion; ἄκανθα, μέτρον.
Zygacantha = Spines opposite in pairs; ζυγά, ἄκανθα.
Acanthonia = Spiny article; ἄκανθα, ὤνια.
Lithophyllium = With stony leaves; λίθος, φύλλιον.
Phractacantha = Spines enclosed by a hedge; φρακτός, ἄκανθα.