Polydesmida: Xystodesmidae: Xystocheirini. Xystocheir dissecta taibona Chamberlin, 1912. North America, USA, California, Santa Clara Co. Photo courtesy of W. P. Leonard.

Polydesmida: Xystodesmidae: Xystocheirini. Motyxia tiemanni Causey, 1960. North America, USA, California, Tulare Co., 2 mi. W Three Rivers. Photo by Darwin Tiemann.

Polydesmida: Xystodesmidae: Xystocheirini. Motyxia sequoia sequoia (Chamberlin, 1941) North America, USA, California, Tulare Co., 8.5 mi E Hammond. Photo by Darwin Tiemann.

Polydesmida: Xystodesmidae: Xystocheirini. Xystocheir modestior modestior (Chamberlin, 1941). North America, USA, California, Fresno Co., 3 mi S O'Neals. Photo by Darwin Tiemann.

Polydesmida: Xystodesmidae: Xystocheirini. Motyxia tiemanni Causey, 1960. North America, USA, California, Kern Co., Shirley Meadows. Photo by Darwin Tiemann.

Polydesmida: Xystodesmidae: Xystocheirini. Motyxia pior Chamberlin, 1941, under black light. North America, USA, California, Tulare Co., Dry Creek. Photo by Darwin Tiemann.

Polydesmida: Xystodesmidae: Xystocheirini. Motyxia tiemanni Causey, 1960. North America, USA, California, Kern Co., Shirley Meadows. Photo by Darwin Tiemann.

Polydesmida: Xystodesmidae: Xystocheirini. Motyxia tiemanni Causey, 1960, instars emerging from molting chambers. North America, USA, California, Kern Co., Shirley Meadows. Photo by Darwin Tiemann.

Polydesmida: Xystodesmidae: Xystocheirini. Motyxia sequoia sequoia (Chamberlin, 1941), mating pair. North America, USA, California, Tulare Co., Camp Belknap. Photo by Darwin Tiemann.

Polydesmida: Xystodesmidae: Xystocheirini. Motyxia sequoia sequoia (Chamberlin, 1941) North America, USA, California, Tulare Co., 8.5 mi E Hammond. Photo by Darwin Tiemann.