Reticulated Spider Conch, commonly known as the Scorpion Conch or Horned Spider Conch
Phylum: Mollusca, Class: Gastropoda, Order: Littorinimorpha, Family: Strombidae, Genus: Lambis, Species: Lambis lambis · Strombidae (True Conch family) · Gastropod (univalve snail), whole shell, spiral shape with digitations
Species
Lambis lambis
Shell Type
Gastropod (univalve snail), whole shell, spiral shape with digitations
Family
Strombidae (True Conch family)
Size
Approximately 5 to 6 inches in length, which is a standard adult size for this species. Fully grown adults typically range from 4 to 7 inches.
Color & Pattern
The exterior features a creamy white or pale tan base color overlaid with rich brown, reddish-brown, or orange reticulated patterns, blotches, and spiral bands. The elongated digitate projections feature distinct brown barring and dark tips. The interior aperture is typically glossy with shades of pink, purple, or white. Colors appear completely natural and well-preserved.
Rarity
Common to Uncommon. It is frequently found throughout its native Indo-Pacific range and is a standard fixture in shell shops, though pristine specimens with intact finger-like projections are more highly valued.
Habitat
Found primarily in shallow sub-tidal waters, reef flats, and sandy areas near coral reefs, generally at depths ranging from intertidal zones down to about 10 meters. It prefers sandy or muddy substrates mixed with coral rubble.
Geographic Range
Widely distributed throughout the Indo-Pacific region, including East Africa, Madagascar, the Red Sea, Indian Ocean, Southeast Asia, Indonesia, Australia, and extending eastward to various Pacific islands.
Description
This striking and heavily armored gastropod is immediately recognized by its elaborate, extension-heavy outer lip adorned with six distinct, long, claw-like or finger-like digitations curving gracefully outward. The spire is relatively short and stout, covered in knobby tubercles and rugged spiral cords. The shell feels solid and heavy in the hand, heavily reinforced against predators.
Key Features
The presence of six distinct, claw-like digitate projections extending from the outer lip, along with a stout, knobby body whorl and a distinct stromboid notch near the anterior canal, distinguishing it clearly from other conch species.
Collector Value
Moderately high collectible value among enthusiasts of Indo-Pacific gastropods. While common in commerce, specimens with completely unbroken and undamaged marginal fingers command better value, typically ranging from $15 to $40 depending on exact size and perfection.
Condition Notes
The shell is in very good to fine condition. All major digitate projections appear intact with minimal tip wear, which is common for this delicate feature. No major boring holes or heavy algal encrustations are visible. Collectibility grade is Fine.
Interesting Facts
Unlike most snails that glide smoothly, Lambis species move in a jerky, leaping motion using their operculum as a lever. The long, finger-like projections are believed to help deter predators and provide stability on soft sandy bottoms.
Ecological Role
Lambis lambis acts as an important benthic grazer, feeding primarily on microalgae, detritus, and organic matter on sandy substrates. It serves as prey for large carnivorous gastropods, crustaceans, and fish, and its empty shell frequently provides secondary shelter for hermit crabs.
Similar Species
Lambis scorpius (Scorpion Conch), which has more curled, highly rugose digits and darker coloration; and Lambis chiragra (Platter Conch), which is significantly larger with massive, upward-curving digits.
Beach Finding Tips
Look along tropical Indo-Pacific drift lines, shallow reef flats, and lagoon beaches during low tide, particularly after storms. However, live specimens are protected in many marine parks, so beachcombers usually encounter weathered or empty shells.