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