Head to head
Vent Crab vs Pompeii Worm
Both animals live around hydrothermal vents, but one moves freely between vents while the other stays fixed in place tolerating extraordinary heat.
| Vent Crab | Pompeii Worm | |
|---|---|---|
| Scientific name | Bythograea thermydron | Alvinella pompejana |
| Diet | Omnivore, scavenging and preying on smaller vent animals | Omnivore, relying partly on bacteria cultivated on its own back |
| Mobility | Mobile, moves between vent sites | Sessile, lives inside a fixed tube |
| Temperature tolerance | Must avoid the hottest vent water | Tail end can tolerate water over 80°C |
| Notable adaptation | Balances distance from vent heat while scavenging | A fleece-like coating of bacteria on its back |
| Role in vent community | An early predator and scavenger colonising new vents | A heat-tolerant pioneer studied for extremophile biology |
| Conservation status | Not Evaluated | Not Evaluated |
| Habitat | Ocean | Ocean |
Vent Crab vs Pompeii Worm: common questions
Which one can tolerate the more extreme heat, the vent crab or the Pompeii worm?
The Pompeii worm tolerates far more extreme direct heat, with its tail end able to sit in water exceeding 80 degrees Celsius, while the vent crab instead must actively avoid the hottest vent water to survive.
Which one is mobile and which stays fixed in place?
The vent crab is mobile, moving between vent sites as a scavenger and predator, while the Pompeii worm remains sessile, living inside a fixed tube attached directly to a vent chimney for its entire life.
What does each animal eat?
The vent crab scavenges dead organisms and preys on smaller vent animals such as mussels, worms, and shrimp, while the Pompeii worm relies partly on bacteria it cultivates in a fleece-like coating on its own back.