The plural of heteropod, or the taxonomic group containing these free-swimming marine mollusks.
From Greek 'hetero-' (different) + 'poda' (plural of 'pous', meaning feet). This is the scientific classification term for the entire family of these creatures.
Heteropoda includes some seriously bizarre creatures like the sea butterfly, which despite living underwater isn't actually a butterfly—it's a living fossil that has barely changed in 60 million years!
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