Phylum - Annelida
Common name: Worms
Name derivation: “ring form”
- Class: Clitellata
- Class: Polychaeta
Order Count: 28
Family Count: 160
Genus Count: 2,403
Species Count: 18,396
Earliest Fossil Record: Cambrian 541 - 485 mya
Habitat: Marine, Terrestrial, Freshwater
Size Range: 0.05 mm to 2.4 m
Notes: Pogonophora and Echiura now included as divisions within Annelida rather than as separate Phyla. Sipuncula included by some as an Order within Annelida but kept as a Phylum by Catalogue of Life for now. Based on Catalogue of Life as of March 2025
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