The “Jourdan’s Turban” is the second largest extant turban shell, just behind Turbo marmoratus Linnaeus, 1758 which holds the record. The specimen depicted is quite large for this not uncommon species, but they may reach 240mm.
This species is endemic to Western and Southern Australia. It inhabits shallow water to about -30m depth just offshore along rocky reefs, it is a grazing herbivore.
Most specimens seen on the market have filed lips because it is a thin-lipped species almost always with chipped lip. This is especially true for large ones over 200mm, and finding a specimen with natural lip is quite difficult. – from Chong Chen’s post
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