Boiler Crab Species in The Fabulae Anthology | World Anvil
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Boiler Crab

Head-resistant Hothead

Written by Endrise

Crabs truly are an enigma of the evolutionary tree.
— Biologist

Amongst the sealife that adapted to the Boiling Depths, one of them is the Boiler Crab. A hefty creature built to endure intense pressures and unbearable heat, thriving in the oceanic trench.

Basic Information


Relatively small for its posture, the crustacean is distinguishable by its low profile, hefty size and large claws. An average adult can have their pinchers reach up to a third of their body's size, making them both powerful and meaty in nature.

The shell itself integrates elements of iron and other metals coating the exterior. From it it gains a rust orange and metallic silver look. Multiple small holes riddle the backside of the crab, each able to close up. They use this to regulate their body temperature.

Ecology and Habitats

Boiler Crabs live near hydrothermal vents to feed off the sealife living there. When not actively hunting for food, it likes to bury itself on the ocean floor to hide for larger predators.

Few specimens live near the surface, making their appearance scarce. Most end up dying when fished up from their depths due to the pressure differences.

Dietary Needs and Habits

Boiler Crabs are not known to be picky eaters. Most thrive of the diverse ecosystems that live on the ocean floor, scavenging anything their pinchers can grab. Everything from seasponges to small fish, shrimps to even fellow crabs.

Biological Cycle

Like many crabs, the Boiler Crabs molts its shell several times throughout its lifespan. Due to the rich metal nature of its shell, it needs to do so in a more destructive manner.

To do so, it will trap cold water within its shell, only to heat it up near hydrothermal vents. The steam produced within forces it to crack, allowing the crustacean to squeeze out. The steam also allows it to scare off any larger predators while molting.

The few days after has it hide itself from predators to harden its shell.

Additional Information

Uses, Products & Exploitation

Some aquatic races like Tritons and Merfolk utilise the shells of Boiler Crabs as heat-resistant material. Everything from plates to shields and tools are made using the crustacean.

Others simply eat it straight out the shell. While hard to cook, letting it slowly boil inside its own shell is the best way to prepare one.

Geographic Origin and Distribution

Most species of Boiler Crabs can be found living at the Boiling Depths. Although some specimens do exist at other places with hydrothermal vents.

10 years
Average Height
20 centimetres
Average Weight
up to 10 kilograms
Average Physique
Body Tint, Colouring and Marking
Rust orange, sometimes metallic silver
Geographic Distribution

Cover image: Species - Aquatic Cover by Endrise


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Jul 13, 2021 17:31 by Amélie I. S. Debruyne

"crabs are the final evolution of all things." Exactly XD   I remember the discussion about their biology on discord and I like what you have here in the end, seems logical to me :D