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The septoid, or Ja Field septoid, was a seven-legged insect indigenous to Eriadu. Septoids were fearless pests that survived centuries of attempts to exterminate them, only to adapt and thrive once more. Their exposure to the Eriaduan global pollution only seemed to make them hardier and more numerous, hence the Eriaduan expression 'tough as a septoid.' Its central thorax contained its head and eyestalks, as well as two sets of venom-less fangs. Its seven legs radiated outward in such a way that the septoid had no true front or back. These legs were made of serrated chitin, and made a distinctive sound when the septoid walked on hard surfaces, such as duracrete.

The WED-15 droid series was named and somewhat patterned after the septoid.