Green Turban Snail (also known as the Snakehead Turban)
Phylum: Mollusca, Class: Gastropoda, Order: Trochida, Family: Turbinidae, Genus: Lunella, Species: Lunella smaragdus · Turbinidae (Turban shell family) · Gastropod, whole shell, spiral shape
Species
Lunella smaragdus
Shell Type
Gastropod, whole shell, spiral shape
Family
Turbinidae (Turban shell family)
Size
Approximately 2 to 2.5 inches in width, which is average to large for this species. Adults typically range from 1.5 to 3 inches.
Color & Pattern
Vibrant emerald green to olive-brown patches intertwined with mottled white and cream markings. The coloration is entirely natural, featuring a glossy, smooth finish with striking contrast between the deep green flames and the white background.
Rarity
Common within its native range, frequently found by beachcombers along rocky New Zealand coastlines.
Habitat
Found in shallow intertidal and subtidal zones, typically inhabiting rocky shores, tide pools, and areas with abundant algae growth on rocky substrates in marine environments.
Geographic Range
Endemic to New Zealand and surrounding sub-Antarctic islands, commonly found all around the North and South Islands.
Description
A sturdy, globular marine snail shell with a low, rounded spire and a heavy structure. The exterior surface is smooth yet displays distinct growth lines, adorned with a captivating pattern of rich emerald green and white axial flames. The body whorl is large and bulbous, showcasing the robust engineering typical of herbivorous grazers in turbulent intertidal waters.
Key Features
Heavy, solid construction, low rounded spire, bulbous body whorl, and a distinct vibrant green and white mottled or flamed color pattern.
Collector Value
Moderately low commercial value due to its commonality in its native region, but highly prized by regional collectors and tourists as a souvenir of New Zealand shores. Typically valued between $2 to $10 depending on condition.
Condition Notes
The shell is in fine to gem condition, completely intact with strong natural colors, no visible cracks, and minimal wear on the apex, indicating it was likely collected shortly after the animal's natural death.
Interesting Facts
Like other turban shells, the animal possesses a heavy, calcareous operculum (trapdoor) known locally in New Zealand as 'cat's eyes', which protects it from predators and desiccation when the tide goes out.
Ecological Role
As an herbivorous grazing gastropod, it plays a vital role in controlling microalgae populations on rocky reefs, thereby maintaining healthy benthic ecosystems. It serves as food for various marine predators including fish and crustaceans.
Similar Species
Other members of the Turbinidae family, such as Turbo smaragdus or various Australasian turban snails, which can be distinguished by subtle differences in sculpture, umbilical depression, and operculum morphology.
Beach Finding Tips
Search rocky intertidal zones, particularly around low tide, by exploring tide pools and checking crevices in reefs or under overhangs where algae thrives.