Just read this:
The female Sacculina larva finds a crab and walks on it until she finds a joint. She then molts into a form called a kentrogon, which injects her soft body into the crab while its shell falls off. The Sacculina grows in the crab, emerging as a sac, known as an externa, on the underside of the crab's rear thorax, where the crab's eggs would be incubated.
After this invasion of the Sacculina, the crab is now unable to perform the normal function of molting. This results in a loss of nutrition for the crab, and impairs its overall growth. The natural ability of regrowing a severed claw that is commonly used for defense purposes is therefore lost after the infestation of Sacculina.
The male Sacculina 'larva' looks for a virgin female Sacculina on the underside of a crab. He then implants its cells into a pocket in female's body, once called "testis", where male cells produce spermatozoa to fertilize eggs. Parasitic Sacculina destroys crab's gonads to render the crab permanently infertile.
When a female Sacculina is implanted in a male crab it interferes with the crab's hormonal balance. This sterilizes it and changes the bodily layout of the crab to resemble that of a female crab by widening and flattening its abdomen, among other things. The female Sacculina then forces the crab's body to release hormones, causing it to act like a female crab, even to the point of performing female mating dances. If the parasite is removed from the host, female crabs will normally regenerate new ovarian tissue, while males usually develops complete or partial ovaries instead of testes.
Although all energy otherwise expended on reproduction is directed to the Sacculina, the crab develops a nurturing behavior typical of a normal female crab. The natural hatching process of a crab consists of the female finding a high rock and grooming its brood pouch on its abdomen and releasing the fertilized eggs in the water through a bobbing motion. The female crab stirs the water with her claw to aid the flow of the water. When the hatching larvae of Sacculina are ready to emerge from the brood pouch of female Sacculina, the crab performs a similar process. The crab shoots them out through pulses creating a large cloud of Sacculina larvae. The crab uses the familiar technique of stirring the water to aid in flow.
tldr: crabs are cucks
The female Sacculina larva finds a crab and walks on it until she finds a joint. She then molts into a form called a kentrogon, which injects her soft body into the crab while its shell falls off. The Sacculina grows in the crab, emerging as a sac, known as an externa, on the underside of the crab's rear thorax, where the crab's eggs would be incubated.
After this invasion of the Sacculina, the crab is now unable to perform the normal function of molting. This results in a loss of nutrition for the crab, and impairs its overall growth. The natural ability of regrowing a severed claw that is commonly used for defense purposes is therefore lost after the infestation of Sacculina.
The male Sacculina 'larva' looks for a virgin female Sacculina on the underside of a crab. He then implants its cells into a pocket in female's body, once called "testis", where male cells produce spermatozoa to fertilize eggs. Parasitic Sacculina destroys crab's gonads to render the crab permanently infertile.
When a female Sacculina is implanted in a male crab it interferes with the crab's hormonal balance. This sterilizes it and changes the bodily layout of the crab to resemble that of a female crab by widening and flattening its abdomen, among other things. The female Sacculina then forces the crab's body to release hormones, causing it to act like a female crab, even to the point of performing female mating dances. If the parasite is removed from the host, female crabs will normally regenerate new ovarian tissue, while males usually develops complete or partial ovaries instead of testes.
Although all energy otherwise expended on reproduction is directed to the Sacculina, the crab develops a nurturing behavior typical of a normal female crab. The natural hatching process of a crab consists of the female finding a high rock and grooming its brood pouch on its abdomen and releasing the fertilized eggs in the water through a bobbing motion. The female crab stirs the water with her claw to aid the flow of the water. When the hatching larvae of Sacculina are ready to emerge from the brood pouch of female Sacculina, the crab performs a similar process. The crab shoots them out through pulses creating a large cloud of Sacculina larvae. The crab uses the familiar technique of stirring the water to aid in flow.
tldr: crabs are cucks
