An insect that does not undergo metamorphosis and looks similar throughout its life.
From Greek 'a-' (without) plus 'metabole' (change), coined as a scientific term for insects without radical life-stage changes.
Silverfish are ametaboles—they're basically the same tiny shape their whole lives, never transforming into a totally different form like caterpillars do, which is weird when you think about how most insects completely reinvent themselves.
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