Head to head
Vent Shrimp vs Giant Tube Worm
Both animals live at hydrothermal vents and depend on chemosynthetic bacteria, but one keeps a functional gut while the other has none whatsoever.
| Vent Shrimp | Giant Tube Worm | |
|---|---|---|
| Scientific name | Rimicaris exoculata | Riftia pachyptila |
| Digestive system | Has a functional gut, scrapes bacteria off itself to eat | No mouth, gut, or anus at all as an adult |
| Where bacteria live | On the outside of the body | Inside an internal organ called the trophosome |
| Mobility | Mobile, forms large swarms | Sessile, anchored inside a tube for life |
| Growth rate | Not well documented | Extremely fast, over 30 cm per year |
| Notable structure | A light-sensing organ on its back | A bright red plume used to gather chemicals |
| Conservation status | Least Concern | Not Evaluated |
| Habitat | Ocean | Ocean |
Vent Shrimp vs Giant Tube Worm: common questions
Which one has no digestive system at all, the vent shrimp or the giant tube worm?
The giant tube worm is the one with no digestive system as an adult, lacking a mouth, gut, and anus entirely, while the vent shrimp retains a functional gut and actively scrapes bacteria off its own body to eat.
Which one can move to find a new vent?
The vent shrimp can move, forming large mobile swarms around vent chimneys, while the giant tube worm remains permanently anchored inside its tube once settled, unable to relocate as an adult.
Do both rely on the same kind of bacteria?
Both rely on chemosynthetic bacteria that convert vent chemicals into food, but the vent shrimp farms its bacteria on the outside of its body while the giant tube worm houses its bacteria inside an internal organ called the trophosome.