Pseudopolydesmus serratus (Say, 1821). North America, USA, North Carolina, Wake Co.

Retrorsia leonardi Shelley, 2003 (Zootaxa, 296:1-12). North America, USA, Washington, Cowlitz Co., Germany Creek. Photo courtesy of W. P. Leonard.

Retrorsia n. sp. North America, Washington, Cowlitz Co., Germany Cr. Photo courtesy of W. P. Leonard.

Scytonotus bergrothi Chamberlin, 1911. North America, USA, Washington, King Co., Snoqualmie River. Photo courtesy of W. P. Leonard.

Unidentified Polydesmidae. Asia, China, unnamed cave in Sichuan Prov. Photo courtesy of J. Krejca.

Scytonotus bergrothi Chamberlin, 1911. North America, USA, Washington, King Co., Snoqualmie River. Photo courtesy of W. P. Leonard.

Unidentified Polydesmidae. Asia, Vietnam, Cat Tien National Park. Photo courtesy of Nguyen Duc Anh.