part_of adult leg adult leg ball and socket joint Ball and socket joints are a unique feature of the legs of Nuttalliella namaqua, the only species of the family Nuttalliellidae. This feature has not been reported in other acarines and may be unique for the entire subclass. Fig. 2-36, in Biology of Ticks ISBN:0-19-505910-7. TADS:0000471 TADS:0000471 default_namespace