A new genus and species of rhagidiid mite, Arhagidia monothrix, is described and illustrated from specimens collected from the Jornada ecological research site of the Chihuahuan Desert in southern New Mexico. Uniquely derived morphological characteristics of this taxon include a reduced palpal chaetotaxy, an unpaired seta inserted on the naso, enlarged and nearly contiguous coxisternal plates I, absence of rhagidial depressions where solenidia are inserted on tarsi I and II, two pairs of setiferous tubercles dorsodistally on tarsus I, and an elongated body with short appendages. Some of these reflect adaptations to living in the soil. Eupathidial setae are distinguished and denoted from setiform setae on the femoral, genual, fibial, and tarsal segments of the legs of a rhagidiid mite for the first time.
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Lindquist et al. (1987) studied this question.
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