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Common name: Penis worms
Name derivation: “Priapus” Roman god with large penis
Number of Orders: 4
Number of Families: 5
Number of Genus: 7
Number of known Species: 22
Earliest Fossil Record: Middle Cambrian 510 mya
Habitat: Marine
Size Range: 2 mm to 39 cm
Notes: Based on Catalogue of Life as of July 2024