Tomato Crab corbus tamatas
Domesticated
Tomato crabs commonly develop anxiety issues when left alone for too long, make sure you don't forget to bring them to work with you!
These small critters develop strong pack bonds with their owners and other crabs, making them a quite high upkeep pet and a pet you have to dedicate to for years to come.
Despite their visually hard shell exterior they are actually really squishy and soft, most can also not sleep alone so will either cuddle up with their fellow pack members and or owner(s).
Tomato Crabs are commonly seen as good delivery workers for professional chefs, since they always know how to find their way back home.
It is believed that the Tomato crab is closely related to the smaller species you can often find in shells on the beach!
Presumably due to a dietary difference these crabs ended up getting a lot bigger than the other species that roam the planet, maybe they ended up taking the path of least resistance to increase their survival odds.