Spider Conch, Common Spider Conch
Phylum: Mollusca, Class: Gastropoda, Order: Littorinimorpha, Family: Strombidae, Genus: Lambis, Species: Lambis lambis · Strombidae (True Conchs) · Gastropod (Sea Snail). This is a whole adult shell characterized by a heavy stromboid shape with elongated labial digitations (spines).
Species
Lambis lambis
Shell Type
Gastropod (Sea Snail). This is a whole adult shell characterized by a heavy stromboid shape with elongated labial digitations (spines).
Family
Strombidae (True Conchs)
Size
Approximately 7-9 inches in length inclusive of the spines. This is a standard size for an adult specimen of this species, which typically ranges from 4 to 11 inches.
Color & Pattern
External color is a creamy tan with mottled brown bands and streaks. The aperture (mouth) features a smooth, polished surface with colors ranging from pale peach and orange to a rich pinkish-purple deep within the throat. The columellar lip and outer lip are thick and glazed.
Rarity
Common. It is one of the most frequently encountered species of the Lambis genus in its native range.
Habitat
Found in shallow tropical waters, primarily in coral reef ecosystems, sandy bottoms, and seagrass beds at depths ranging from the low tide mark to about 30 meters.
Geographic Range
Widely distributed throughout the Indo-West Pacific region, from East Africa and the Red Sea to the Philippines, Japan, and northern Australia.
Description
A robust and spectacular gastropod featuring seven distinct, finger-like projections (digitations) extending from the outer lip. The shell is heavy and thickened, with a spire that is usually encrusted in the wild but cleaned to show a textured surface in collections. The most striking feature is the flared, polished aperture which glows with warm sunset tones.
Key Features
Distinguished by seven labial spines (including the siphonal canal), a relatively smooth inner aperture compared to other Lambis species, and a distinct 'stromboid notch' near the siphonal canal for the animal's eye stalk.
Collector Value
Modest collector value ($10 - $25 USD). While beautiful, its abundance makes it more of a 'staple' for beginners or a decorative piece rather than a high-end investment shell. Extraordinarily large or perfectly dark-purple specimens command higher prices.
Condition Notes
The specimen appears to be in 'Fine' to 'Very Fine' condition. The digitations are largely intact, which is rare for beach-found shells but common in diver-collected specimens. The color is well-preserved, though there is slight blunting on the tips of the spines.
Interesting Facts
The animal within is a scavenger and herbivore that moves with a unique 'leaping' motion using its operculum as a literal hook into the sand. In many cultures, the meat is a food source and the shells are used as traditional trumpets or charms.
Ecological Role
An important herbivore that grazes on algae and detritus, helping to maintain the health of coral reef and seagrass ecosystems. It serves as prey for large crustaceans and octopuses.
Similar Species
Lambis truncata (much larger and heavier), Lambis chiragra (spines are arranged differently and aperture is more constricted), and Lambis millepeda (has many more spines).
Beach Finding Tips
Best found by snorkeling over seagrass beds or reef flats during low spring tides. Dead shells found on beaches are usually heavily eroded with broken spines due to wave action.