A division of Arachnoidea, including the daddy longlegs orharvestman (Phalangium) and many similar kinds. They have long,slender, many-jointed legs; usually a rounded, segmented abdomen; andchelate jaws. They breathe by tracheæ. Called also Phalangides,Phalangidea, Phalangiida, and Opilionea.
