Although their imago form is never seen, the Primitive Mothras resemble most other examples of a Mothra Larva. However, their skin appears to be much thicker and bears what seems to be armour plating. Unlike modern Mothras, the eyes of a Primitive Mothra do not glow.
Three Primitive Mothras first appeared after Rainbow Mothra's battle with Cretaceous Ghidorah. Rainbow Mothra was badly injured, and the three formed a cocoon around him, sealing him for millions of years so he could heal from his injuries, and millions of years later, it is revealed that the cocoon also caused Rainbow Mothra to evolve into Armor Mothra and become strong enough to defeat King Ghidorah.
- Like all Mothra Larvae, the Primitive Mothras spray web from their mouths.
- Main article: Primitive Mothra/Gallery.
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