Jumping spiders fangs. Coloured scanning electron micrograph (SEM) of the fangs on the end of a jaw (chelicera) of a jumping spider (family: Salticidae).Taken from a spider exuvia (molt). Some chelicerae in spiders are hollow and contain, or are connected to, venom glands. The fangs are used to inject venom into prey. Magnification: x100 when printed at 10cm wide.