It’s a real shame. Forty million years ago, this pair of mites, Glaesacarus rhombeus, had just buckled down to a happy grind, when plop, a drop of tree sap fell on them and entombed them in flagrante delicto. Also, coitus interruptus. And as long as we’re slinging around the Latin, Perfututum!.
Notice that they mate butt-to-butt. This is probably the preferred position when your partner has a face like an arachnid.