The most basic, original form of something — especially when you're talking about insects — can be described as larval. A caterpillar is the larval form of a butterfly.

In animals that take one form before metamorphosing into their adult shape, that first, immature stage is larval. The larval phase of a frog is a tadpole, and the larval form of a fly is a tiny, white, squirming maggot. You can also use this adjective in a figurative way, for the early stage of non-insects: "My novel is really still in its larval form. It's actually just a paragraph."

Definitions of larval
  1. adjective
    relating to or typical of a larva
    “the larval eye”
  2. adjective
    immature of its kind; especially being or characteristic of immature insects in the newly hatched wormlike feeding stage
    larval societies”
    larval crayfishes”
    “the larval stage”
    not yet mature
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