(after Carver et al. 1991): Sternorrhyncha includes the psyllids (jumping plant lice), white flies, aphids, coccids, mealybugs and scale insects. Their monophyly is established by the absence of a vannus and vannal fold in the hind wing, and the movement of the mouth-parts so far posteriorly that the labium originates from the prosternum.
Publications
Carver M, Gross GF, Woodward TE
(1991):
Hemiptera (bugs, leafhoppers, cicadas, aphids, scale insects etc.). In: The insects of Australia. A textbook for students and research workers. 2nd edition. Volume 1. CSIRO, Melbourne. 429
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509