The whitefly fauna of Europe and the Mediterranean Basin comprises 56 species that are considered to be native or naturalized, accommodated within 25 genera. Presented here are a check-list, an identification key to puparia, and a brief account of each species including its distribution and host-plant range. The puparium of each species is illustrated. One new nomenclatural combination (Aleuroclava similis, from Aleurotuberculatus) and two new synonymies (Parudamoselis kesselyaki with Ceraleurodicus varus, Asterobemisia nigrini with A. paveli) are proposed. Three nominal species (Aleurodes capreae, A. fraxini, and Aleyrodes campanulae) are here treated as nomina dubia. Species which, in the study area, have only been recorded from glasshouses are discussed. Four additional species, not yet recorded from the region, are included in the discussion, two of them because a particular quarantine risk is perceived and two because they are notifiable pests in European Union quarantine legislation.

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An updated check list of the world’s extant whitefly species is presented, comprising 1556 accepted species names in 161 genera, together with a further 210 species-group names and 40 genus-group names in synonymy. 13 nomina nuda, seven nomina dubia and six species now formally excluded from the Aleyrodidae are listed. Nomenclatural changes introduced here are 10 new generic and 10 new specific synonymies, together with 23 new combinations, seven new replacement names for junior homonyms and one revived original combination. Three subfamilial names are available in the Aleyrodidae, most species being placed in the Aleyrodinae or Aleurodicinae. The controversial third subfamily, Udamoselinae, is briefly discussed. For species currently regarded as valid, only the original and current combinations are given, with authorities. Original countries of description are given, here updated to reflect current geopolitical boundaries, but distributions and biological data are not given. An index to all names is provided.

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The genus Aleurodicus is discussed in the context of the whole subfamily Aleurodicinae, and is fully revised with 35 species now included, 10 of them newly described here. The genus Lecanoideus Quaintance & Baker is here regarded as a junior synonym of Aleurodicus syn. nov., and Aleurodicus fucatus Bondar is proposed as a junior synonym of A. capiangae Bondar syn. nov.. Palaealeurodicus gen. nov. is described to accommodate six native Asian species hitherto included in Aleurodicus, along with one new species here described. Aleuroctarthrus gen. nov. is proposed to accommodate Aleurodicus destructor Mackie. Two species are here transferred from Aleurodicus to other genera. Puparial keys are provided to the worldwide genera of Aleurodicinae, and to the described species of Aleurodicus and Palaealeurodicus. Lectotypes are here designated for 11 species of Aleurodicinae, and a neotype for one species. A check list is provided to all the species treated in this paper. The paper is illustrated with 144 figures including 7 plates of habitus photographs.