A taxonomic group or classification of marine organisms, particularly pteropods or sea butterflies with specific morphological characteristics.
Derived from Greek 'pyr' (fire) + 'loia' or Latinized form of 'firolo-' which may relate to structural features. Used in 19th-century marine taxonomy.
Pteropods (sea butterflies) are tiny transparent creatures that literally 'fly' through the water using wing-like feet—and they're increasingly threatened by ocean acidification.
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