Ceratophylloidea

The posterior margin of the metanotum of fleas in the family Ceratophyllidae has spinelets, or tiny pigmented teeth.Created: 1976

Note the difference in the arrangement of the tergal bristles on Ceratophyllidae and Hystrichopsyllidae fleas.Created: 1976

This illustration reveals an identifying characteristic of the rat flea’s, Nosopsyllus fasciatus, head region.Created: 1976