R. G. Beutel & S. N. Gorb, 2001, Ultrastructure of attachment specializations of hexapods (Arthropoda): evolutionary patterns inferred from a revised ordinal phylogeny, J. Zool. Syst. Evol. Research 39, pp. 177-207: 180

publication ID 10.1046/j.1439-0469.2001.00155.x

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22 Sternorrhyncha 

The tarsus is two­segmented in most representatives of Sternorrhyncha  , but one­segmented in coccoids ( Strumpel 1983). A cushion­like, simple or bilobed arolium is present in many psylloids. Some representatives of Aphididae  possess pulvilli. Other aphidid species examined are characterized by an eversible structure resembling euplantula between tibia and tarsus ( Lees and Hardie 1988; Dixon et al. 1990) ( Fig. 3fView Fig. 3).