Opiliones
Harvestmen have exceptionally long walking legs compared to their bodies, although there are also short-legged species. In harvestmen, the two main body sections (the abdomen and cephalothorax) meet at a wide point, so that they appear to be one oval structure. In more advanced species of harvestmen, the first five segments of the abdomen are fused into a "shield" on the harvestman's back called the scutum. In some species, this shield is only present in males. The second pair of legs is longer than the others and works as antennae. This can be hard to see in short-legged species.