Lambis or Spider Conch (specifically Lambis lambis or a closely related Strombid)
Phylum: Mollusca, Class: Gastropoda, Order: Littorinimorpha, Family: Strombidae, Genus: Lambis, Species: Lambis lambis · Strombidae (True Conchs and Spider Conchs) · Gastropod (univalve), whole shell, spiral shape with prominent finger-like digitations on the outer lip
Species
Lambis truncata or Lambis lambis (Juvenile or compressed form)
Shell Type
Gastropod (univalve), whole shell, spiral shape with prominent finger-like digitations on the outer lip
Family
Strombidae (True Conchs and Spider Conchs)
Size
Approximately 4-5 inches in length. Adults of the genus typically range from 3 to 12 inches depending on the specific species.
Color & Pattern
Warm peach, cream, and tan coloration with a lustrous, glossy interior aperture featuring shades of pink, orange, and white. The outer shell shows faint brown banding and natural wear.
Rarity
Common in its native range, frequently encountered in local markets and shell shops, though pristine specimens require selective collecting.
Habitat
Shallow tropical waters, primarily on coral reef flats, sand flats, and among seagrass beds from the intertidal zone down to about 30 meters.
Geographic Range
Indo-Pacific region, spanning from the Red Sea and East Africa across the Indian Ocean to the tropical waters of the Western Pacific and Australia.
Description
An exquisite marine gastropod featuring a robust, heavy body whorl adorned with blunt knobs and a heavily flared outer lip extending into several distinct, claw-like finger projections or digitations. The interior aperture is smooth and porcelain-like, displaying warm pastel tones.
Key Features
Distinguished by its prominent stromboid notch on the outer lip (though partially modified by the digitations) and the characteristic claw-like projections extending from the outer margin.
Collector Value
Moderately valued by shell collectors worldwide. Common species within the genus are affordable and popular for decorative displays, while rarer species command higher prices.
Condition Notes
Good to Fine condition. The shell is structurally intact with minor natural wear on the tips of the digitations. Colors are natural with a soft sheen; no major fractures or structural repairs observed.
Interesting Facts
Unlike most snails that glide smoothly, strombid conchs move in a distinctive, jerky leaping motion using their operculum like a pole vault. They are strictly herbivorous, feeding on algae using a specialized radula.
Ecological Role
Plays an important role as an algal grazer in coral reef ecosystems, helping to keep algal growth in check. They serve as prey for large carnivorous gastropods, fish, and octopuses.
Similar Species
Other members of the genus Lambis such as Lambis crocata and Lambis scorpius, which can be distinguished by the number, shape, and curvature of their digitations.
Beach Finding Tips
Best found by snorkeling or scuba diving in shallow tropical sand and reef environments at low tide, as live specimens and well-preserved beach shells rarely wash ashore completely intact.