English: Palpigrades; Microwhip scorpions.
Zoology: small, 3 millimetres; thin, pale, segmented integument;segmented abdomen that terminates in a whip-like flagellum; 15 segment-like parts, or "articles", bearing bristles, giving the whole flagellum the appearanace of a bottle brush; carapace is divided into two plates between the third and fourth leg pair of legs; no eyes.
As in some other arachnids, the first pair of legs are modified to serve as sensory organs, and are held clear of the ground while walking; use their pedipalps for locomotion, so that the animal appears to be walking on five pairs of legs; some have three pairs of abdominal lung-sacs, although these are not true book lungs as there is no trace of the characteristic leaf like lamellae which defines book lungs. However, many species have no respiratory organs at all and breathe directly through the cuticle.