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Annelida is a phylum within the kingdom Animalia, commonly referred to as annelids. The taxon was described by Lamarck in 1802 under the name Annelides and currently holds an accepted status. This group of organisms has existed since approximately 530 million years ago, with a start time recorded at about 516 million years ago. Annelids inhabit marine, brackish, and freshwater environments.

Specimens of this phylum are held by institutions including SDNHM, LACM, UWBM, and USNM, primarily in the United States and Canada. These collections contain 8,956 records and 479 media items. Broader occurrence data indicates 9,907,382 recorded instances, while scientific literature includes 17,405 relevant publications. The taxon is referenced by 2,117 other encyclopedia articles.