A large proportion of psyllid species in the genera Glycaspis and Acizzia (Psyllidae) are specific to one host-plant species in the genera Eucalyptus and Acacia respectively. If short-range endemism is defined on the basis of host-plant specificity, then a large number of Australian psyllid species are short-range endemics. However, this is complicated by factors including the area of distribution of host-plant species, use of different host species by individual psyllid species in different locations, and possible use of several host-plant species within a locality. It is suggested that short-range endemism is an important factor in the diversification of psyllids on eucalypts and wattles.
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Alan L. Yen (2002) studied this question.
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