SO long ago as 1893, Dr. H. J. Hansen published in the Zoologischer Anzeiger a preliminary paper on the morphology of the limbs and mouth-parts in crustaceans and insects. Many of the views adumbrated ...

All insects belong to the phylum Arthropoda. But unlike other arthropods—like lobsters, spiders, or millipedes—insects have three pairs of jointed legs, segmented bodies, an exoskeleton, one pair of ...