In the episode Big Trouble In Little Sanchez, when Jerry wears the Mytholog helmet, Beth's Mytholog is created. It is a giant insectoid, taking traits from spiders, scorpions, snakes and many other creatures.
Being very cunning, Beth's Mytholog creates a plan to escape from the Off-Planet Therapy Retreat (using Jerry's Mytholog). It then attempts to take over the world, being stopped after Jerry and Beth work out their relationship issues and create Ideal Jerry's and Goddess Beth (as well as Self-Congratulatory Jerry).
Beth's Mytholog is largly inspired by many creatures - most notably, scorpions. The tail is very scorpion-like, as well as having very rough, jagged skin. She also has 8 limbs.