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psyllid taxonomy, host plants, and bibliography site by David Ouvrard et al


This page is created and maintained by Diana M. Percy
All images, unless otherwise noted, are copyright Diana M. Percy


Since 2002, I have been working on the psyllids of the Pacific region, focusing on Pacific Ocean islands. I have visited eastern and western regions of the Pacific to survey the psyllid diversity on different islands, and to determine the host plant associations.

Hawaiian Islands: I have now surveyed all the psyllid taxonomic groups in the Hawaiian Islands and the resulting two part revision of the psyllid fauna of the Hawaiian Islands is planned for publication in 2011 and 2012.

Nearing completion is my revision of the psyllids that feed on Metrosideros (Myrtaceae), and in particular the mechanisms of speciation in the Hawaiian Metrosideros-feeding group. Mitochondrial sequence data sets and morphological descriptions for most of these taxa are now complete.


One of the most striking features of the Metrosideros-psyllid system in the Hawaiian Islands is the range of gall types produced by this monophyletic lineage of psyllids as it has diversified on Metrosideros polymorha from one island to the next.

Triozid nymphs of the kuwayama species group on Metrosideros (Big Island)

stem galls (Kauai)

stem galls (Kauai)

stem galls (Kauai)

leaf galls upper leaf (Big Island)

leaf galls under leaf (Big Island)



Considerable leaf mortality can be imposed by the heavy herbivory load from psyllids

A Metrosideros leaf that has been heavily galled by psyllids and leaf necrosis has occurred while still on the branch

Adult psyllids (Kauai)




Go to: psyllid Home page, psyllid acoustics, psyllid morphology, Macaronesian island psyllids, Pacific island psyllids, psyllids of economic importance, psyllid/host plant database

All images, unless otherwise noted, are copyright Diana M. Percy

Created 2000. Updated 20/01/2005. Return to top of page