Giant Spider Conch

Overview

The Giant Spider Conch (Lambis truncata) is the largest and heaviest member of the Strombidae family, reaching lengths of up to 40 cm. This marine gastropod is easily recognized by its massive, robust shell, which features a distinctively squarish outline compared to its relatives.

Appearance

This species is characterized by a thick, heavy shell with six prominent, relatively short marginal digitations (spines) along the outer lip, plus the siphonal canal. While younger shells are typically creamy white, mature individuals often develop a mauve-brown coloration on the columella and lip. The shell's exterior is frequently encrusted with algae, providing effective camouflage against its surroundings. Two subspecies are recognized based on the apex of the shell: L. truncata truncata features a flat apex, whereas L. truncata sebae has a more pointed one.

Distribution & habitat

Lambis truncata is widely distributed across the Indo-West Pacific, ranging from the Indian Ocean—including areas off Madagascar, Mauritius, Tanzania, and the Bay of Bengal—to the Philippines and the Pacific islands. They are typically found in shallow tropical waters, where they inhabit coarse sand, rubble, and reef flats.