I have been overcome by fascination for this creature for the past couple of weeks.
They are arachnids of enormous antiquity who live together in colossal underground warrens with not only their own kind but also any mildly related species. This seems to be some kind of collective defense against cold temperatures, the same way ants use their consolidated body heat to warm their hives.
They have been large enough at times in history to qualify for monster movies and at other times not much bigger than your fingernail. They are the consummate survivalists of all the spiders, lasting through great extinction waves that got nearly everything else.
Although they are almost never venomous, they can exude noxious gases which would be of obvious utility in repelling invaders of their deep burrows.
They seem to go in for different varieties of food storage like ants, with the exception they wrap up meals in waterproof webbing cocoons so they can last many years if they need a snack.
All these creatures need is Vault-OS to organize their hives and they would doubtless rule the planet. Notice how species who pursue Vault strategies always seem to outlast every other approach.