External ultrastructure of sensory organs in the subfamily lrumuinae (Arachnida, Opiliones, Assamiidae)

The external ultrastructure of sensory organs in edaphic reprerentatives of the subfamily Irumuinae is described. The types of receptor are either bristle-shaped or bulbiform. The bristle-shaped receptors occur on the ventral side of the coxae and displace sensory hairs there. The bulbiform ones are distributed over the scute and on proximal joints (femur, trochanter) of legs. These structures are considered as adaptations to the soil environment.