Hairs on a hermit crab? Setae!

Setae are fascinating, hair-like structures on a hermit crab’s body that serve multiple purposes. Think of them as being similar to taste buds and tiny sensors combined. These delicate bristles are incredibly sensitive, allowing hermit crabs to detect subtle changes in their environment, such as vibrations, textures, and even chemical cues. This sensitivity helps them navigate their surroundings, find food, and avoid predators.

Setae come in various forms, each with a unique purpose. There are seven distinct types, each involved in different tasks such as feeding, sensory detection, and water absorption.

Each hermit crab has a unique setae pattern that is as distinct as a fingerprint. This pattern remains consistent throughout the crab’s life, making it an excellent way to identify individual crabs, even after they have molted or changed shells.

One of the best places to observe this unique pattern is on the big claw. Despite any changes in their appearance due to molting or shell changes, the setae pattern on their claw remains the same. This characteristic helps keepers recognize and keep track of their hermit crabs over time. 

So take pictures of your hermit crabs! This way when you’re passing your hermit crabs down to your grandchildren, they’ll know their names!