Devil Conch (also known as the Spider Conch or Scorpion Conch)
Phylum: Mollusca, Class: Gastropoda, Order: Littorinimorpha, Family: Strombidae, Genus: Harpago, Species: H. chiragra · Strombidae (True Conch family) · Gastropod (univalve) whole shell, spiral shape with elaborate digitations
Species
Harpago chiragra (previously Lambis chiragra)
Shell Type
Gastropod (univalve) whole shell, spiral shape with elaborate digitations
Family
Strombidae (True Conch family)
Size
Approximately 5 to 7 inches in length, which is a standard size for adult specimens; adults of this species can range from 4 to 12 inches.
Color & Pattern
The exterior features a creamy white base heavily overlaid with mottled brown, orange, and golden-tan patterns. The interior aperture exhibits a rich, glossy peach to deep orange-pink coloration with white margins on the extensions.
Rarity
Common within its native range, though large, pristine specimens with intact digits are especially prized by collectors.
Habitat
Found in shallow tropical marine waters, typically dwelling on intertidal and subtidal coral reef flats, sand-rubble bottoms, and algal beds down to about 25 meters deep.
Geographic Range
Indo-West Pacific region, ranging from the eastern Indian Ocean across Southeast Asia to the tropical waters of Australia and the Central Pacific.
Description
A magnificent and structurally complex marine snail shell, characterized by its heavily calcified body and distinctive long, curved claw-like projections or 'digits' extending from the outer lip and anterior canal. The shell possesses a sturdy, heavy build with a prominent nodulose spire and a glossy, brightly colored interior aperture.
Key Features
Distinguished by six long, strongly recurved, claw-like digitations extending from the outer margin and siphonal canal, with the two anterior digits being significantly elongated and gracefully curved.
Collector Value
Highly desirable due to its dramatic, alien-like morphology and vibrant interior. Prices generally range from moderate to high depending on size, symmetry, and perfection of the digit tips.
Condition Notes
The specimen appears to be in very good, intact condition with strong, well-preserved natural coloration and minimal damage to the delicate outer claw extensions. Collectibility grade is Fine.
Interesting Facts
The distinctive claw-like projections are used by the living snail to right itself if it gets flipped over on the sand or to anchor itself against strong wave action in high-energy reef environments.
Ecological Role
Acts as an herbivorous grazer feeding on microalgae and detritus across coral reef substrates. It serves as prey for large carnivorous gastropods, fish, and crustaceans. Populations are generally stable but locally impacted by over-collection for the shell trade.
Similar Species
Lambis lambis (Spider Conch) and Lambis scorpius (Scorpion Conch), which can be differentiated by the number, shape, and arrangement of their marginal digitations.
Beach Finding Tips
Best found by snorkeling or diving in shallow reef flats and sand-seagrass transition zones within the Indo-Pacific region, or by visiting local coastal markets where indigenous fishermen bring up bycatch.