Cecidogenesis
Guides
Andricus coquilletti
Andricus coquilletti is a species of gall wasp in the family Cynipidae, a group renowned for inducing characteristic plant galls on oaks. Like other members of its genus, this species has an intimate ecological relationship with oak trees (Quercus spp.), where females deposit eggs into developing leaf tissue using their ovipositor, triggering the formation of protective galls that house developing larvae. The species is part of one of the most diverse radiations of gall-forming insects, with each cynipid species typically producing a distinct gall morphology on specific host tissues.
Phylloxeridae
phylloxerans, phylloxerids
Phylloxeridae is a small family of plant-parasitic hemipterans comprising approximately 75 described species across 11 genera and two subfamilies (Phylloxerininae and Phylloxerinae). These minute insects are closely related to aphids and adelgids, with which they share the superfamily Phylloxeroidea. They are specialized gall-formers on deciduous trees and perennial fruit crops, with complex life cycles involving cyclical parthenogenesis and host alternation between primary woody hosts and secondary herbaceous hosts. The family includes the economically devastating grape phylloxera (Daktulosphaira vitifoliae), responsible for the 19th-century European vineyard crisis.