| abstract | Deutonymphs, and male and female adults, of Stygameracarus cooki sp.nov., and a male adult of S. canadensis sp.nov., are described from interstitial habitats associated with small streams in temperate North America. The genus Stygameracarus and the monobasic subfamily Stygameracarinae are proposed and diagnosed, based primarily on the shape of the capitulum and the highly modified structure of the pedipalps in both deutonymphs and adults, and the distinctive structure of the genital field region in adults. Possible relationships between members of the new genus and other Athienemanniidae are discussed, and a new key to the subfamilies of Athienemanniidae is presented. |