Invertebrates
Spider Conch
Lambis lambis · also called spider conch shell
Bristling with long, curved shell spines that resemble spider legs, a spider conch is far more mobile than most sea snails, using a claw-shaped operculum to flip itself upright and leap away whenever a predator gets too close.
Overview
The spider conch, Lambis lambis, is a large grazing sea snail native to ocean habitat recorded across the Indo-Pacific region. Its distinctive spider-leg-like shell spines, unusually mobile leaping locomotion, and well-developed stalked eyes make it one of the more physically active and visually striking sea snails found anywhere among coral reefs and seagrass beds.
A snail built to escape, not just hide
While most large sea snails rely on a heavy shell and slow retreat to survive, the spider conch has developed a genuinely active escape strategy, using its unusual claw-shaped operculum to flip and leap away from predators rather than simply withdrawing into its shell.
Status
Least Concern, remaining widespread across suitable ocean habitat in the Indo-Pacific, though local populations can face pressure from collection for the shell trade and food.
Spider Conch: common questions
Why does the spider conch have such unusual shell spines?
This species grows a set of long, curved spines extending from the outer edge of its shell, resembling the legs of a spider and giving the species its common name, though the exact evolutionary purpose is still debated.
How does the spider conch move around?
This species uses a hard, claw-shaped operculum, a structure most snails use only to seal their shell, instead to push against the ground and flip itself upright or leap short distances, making it considerably more mobile than many other large sea snails.
Can the spider conch see approaching predators?
Yes, this species has well-developed eyes positioned on long, flexible stalks, allowing it to detect approaching threats such as sea stars more effectively than many other grazing snails.
What does the spider conch eat?
This species is a herbivore, grazing on algae found on the seafloor, particularly around seagrass beds and coral rubble within its Indo-Pacific range.