Reticulated Spider Conch (also known as the Lambis shell or Scorpion Shell)
Phylum: Mollusca, Class: Gastropoda, Order: Littorinimorpha, Family: Strombidae, Genus: Lambis, Species: Lambis scorpius · Strombidae (True Conch family) · Gastropod (univalve), whole shell, spiral shape with elaborate digitations
Species
Lambis scorpius
Shell Type
Gastropod (univalve), whole shell, spiral shape with elaborate digitations
Family
Strombidae (True Conch family)
Size
Approximately 5-6 inches in length including the extended spines, which is typical for an adult specimen. The species typically ranges from 4 to 7 inches.
Color & Pattern
The base color is creamy white to pale yellowish-brown, heavily overlaid with rich reddish-brown or dark brown reticulations, spots, and spiral banding. The prominent finger-like projections (digitations) curve distinctively and feature deep brown tips and banding. Colors appear completely natural and well-preserved.
Rarity
Common to Uncommon, frequently found in specific tropical regions and widely available in shell shops, though pristine large specimens are prized.
Habitat
Inhabits shallow subtidal waters, typically found on coral reef flats, sandy bottoms, and among rubble in depths ranging from the intertidal zone down to about 20 meters.
Geographic Range
Indo-West Pacific region, ranging from East Africa and the Red Sea across the Indian Ocean to Southeast Asia, northern Australia, and the western Pacific islands.
Description
A magnificent and architecturally striking marine snail shell characterized by its robust, heavily ribbed body whorl and a series of long, curved, claw-like projections or digitations extending from the outer lip and anterior canal. The surface is heavily nodulose with strong spiral cords and axial ridges, culminating in a porcelain-like, polished interior aperture.
Key Features
Distinguished immediately by its 6 to 7 long, distinctly curved, finger-like digitations along the outer lip and anterior canal, with the anterior-most projection typically recurved sharply. The heavy knobs on the shoulder and the reticulated brown pattern are also diagnostic.
Collector Value
Moderately high collector value, particularly prized for its dramatic scorpion-like silhouette and complete, unbroken spines. Typically valued between $15 to $45 USD depending on exact size and perfection of the digitations.
Condition Notes
The specimen is in excellent condition (Fine to Gem grade) with all major outer spines fully intact and minimal wear. The natural coloration is strong and vibrant with no significant bleaching or boring damage.
Interesting Facts
Unlike typical snails that glide smoothly, conchs move in a jerky, leaping motion using their operculum as a lever. The scorpion-like appearance of Lambis scorpius helps deter predators and camouflage the animal among complex coral rubble backgrounds.
Ecological Role
Lambis scorpius is a herbivorous grazer, feeding primarily on microalgae and detritus on coral reefs and sandy substrates. It serves as prey for large carnivorous gastropods, crustaceans, and fish, and plays a role in bio-mixing sediment.
Similar Species
Lambis lambis (Common Spider Conch) which has straighter, less ornate digitations, and Lambis chiragra (Platter Claw Conch) which is significantly larger with massive, hand-like claws.
Beach Finding Tips
Best found by snorkeling or diving in shallow tropical reefs and sand flats during calm sea conditions. Empty shells are occasionally washed up onto beaches following severe tropical storms.