The Parasite That Hijacks Crab Biology

Sacculina is a barnacle that acts as a sinister puppet master for crabs. It grows inside its host like a root system, eventually castrating the crab and forcing it to care for the parasite’s offspring as if they were its own.

While we usually think of barnacles as simple shells on piers, this genus evolves into a thread-like network that infiltrates every part of the crab. It essentially turns the host into a zombie that protects and nurtures the parasite’s eggs. Even more unsettling, it can override the hormonal systems of both male and female crabs to suit its needs. It is a true master of biological infiltration hiding in plain sight.