After finding some Willow leaves covered with tiny galls, I opened one up with a razor blade and examined the inside with a Hitachi SEM (Scanning Electron Microscope, courtesy Merritt College, Oakland, CA). I found several dozen mites inside the gall (see attached SEMicrographs). The average length of each mite was about 90um.
Leaf galls in Muehlenbeckia australis consistent with Eriophyes lambi mites.
San Diego County, California, US
Witch's broom deformations on a silver beech tree, consistent with damage from feeding by Aceria waltheri mites.
en un dia lluvioso
Rolled leaf edges consistent with feeding by Aceria melicyti mites, on leaves of mahoe (Melicytus ramiflorus).
Leaf galls on a planted walnut tree. In the hairs on the underside of the walnut leaf galls were a few very small mites, visible through my 20x dissecting microscope.
Acari (or Acarina) are a taxon of arachnids that contains mites and ticks. The diversity of the Acari is extraordinary and its fossil history goes back to at least the early Devonian period. As a result, acarologists (the people who study mites and ticks) have proposed a complex set of taxonomic ranks to classify mites. In most modern treatments, the Acari is considered a subclass of Arachnida and is composed of two or three superorders or...