Mechanoreceptive sensillum fields at the tarsal tip of insect legs.

Groups of mechanoreceptive sensilla form small sensory fields on the ventral rim of the most distal tarsomeres in insects. Within these fields two or three sensilla are located closely together. Anterior and posterior fields are found in all three pairs of legs with only a few exceptions. The composition, exact location, and morphology of the fields were studied in representative species of several insect orders using light and scanning electron microscopy. There was no obvious correlation between field morphology and insect phylogenetic relationships.