Head to head
Scaly-foot Snail vs Vent Mussel
Both molluscs depend on chemosynthetic bacteria to survive at hydrothermal vents, but they differ dramatically in body type, armour, range, and conservation status.
| Scaly-foot Snail | Vent Mussel | |
|---|---|---|
| Scientific name | Chrysomallon squamiferum | Bathymodiolus |
| Mollusc type | A gastropod (snail) | A bivalve (mussel) |
| Notable armour | Foot armoured with iron-sulfide plates | A standard bivalve shell, no iron-sulfide armour |
| Where bacteria live | Inside an enlarged internal gland | Inside gill tissue |
| Range | A handful of vent sites in the Indian Ocean | Multiple ocean basins worldwide |
| Conservation status | Endangered | Least Concern |
| Population trend | Decreasing | Unknown |
| Habitat | Ocean | Ocean |
Scaly-foot Snail vs Vent Mussel: common questions
Which one is a snail and which is a mussel?
The scaly-foot snail is a gastropod, a type of snail, while the vent mussel is a bivalve, a type of mussel, though both rely entirely on internal chemosynthetic bacteria for food.
Which one is considered Endangered?
The scaly-foot snail is classified as Endangered, since its entire known population is confined to a handful of hydrothermal vent sites in the Indian Ocean, while the vent mussel remains classified as Least Concern across a much broader range.
Which one has such a unique iron-based armour?
The scaly-foot snail is the one with this armour, the only known animal to incorporate iron sulfide into its skeleton, a feature not shared by the vent mussel or any other known animal.