It has just come to my attention that “when a male mantis is decapitated, cutting off the brain from the ventral nerve cord, the body begins incessant stepping movements which carry it in a circle.
“In addition, the abdomen and genital appendages begin incessant copulatory movements and a headless male can often mate sucessfully.”
This suggests all sorts of avenues for speculation, none of which I will explore. But don’t let that stop you. Contrast and compare.