A phylum or group of invertebrate animals characterized by segmented, ring-like bodies, including worms and arthropods.
From Latin 'annulosus' (having many rings), using the feminine nominative ending '-a' common in taxonomic nomenclature. Historically used before the modern term 'Annelida.'
Scientists originally called segmented worms 'Annulosa' (the ringed ones) because each body segment is like a tiny ring stacked on another—it's pure observation before we understood genetics or evolution.
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