The insect in your photos a glowworm, which is actually the larval stage or larva-form female of a beetle in the genus Phengodes and family Phengodidae. They are closely related to fireflies or lightning bugs, which are also beetles. However, in this case, the adult male beetles which sort of resemble fireflies with long feathery antennae, do not glow or flash, but rather the larvae and female beetles which resemble the larvae glow at night. Glowworms are predators on millipedes, worms, and other soft bodied insects in the soil. They are harmless to humans, but could potentially bite if carelessly handled. Hopefully, you still have this little lady alive. Take her outside tonight after dark and if you poke at her a little bit to disturb her, she may light up for you. One function of the light is to advertise and warn away predators that these insects are distasteful. I have included a link below to a website with more information about these fascinating insects.

http://entnemdept.ufl.edu/creatures/misc/beetles/glow-worms.htm