Guerrieri, E., & Noyes, J.S. 2000 Revision of European species of the genus Metaphycus Mercet (Hymenoptera: Chalcidoidea: Encyrtidae), parasitoids of scale insects (Homoptera: Coccoidea).. Systematic Entomology 25(2): 147-222.

Notes: Fifty-three European species of Metaphycus are revised. Three generic synonymies are proposed, nine species are described as new, sixteen new specific synonymies and four new combinations are proposed and lectotypes are designated for three species (lounsburyi, philippiae, timberlakei). A dichotomous key to the species is provided, each species is further characterized by a description and notes are provided on their distribution and known hosts. A host-parasitoid index for all known European species is provided in an appendix. Hosts include Antonina graminis, Aspidiotus sp., Asterodiaspis ilicicola, A. quercicola, A. variolosa, Asterolecanium ilicicola, A. minus, A. quercicola, A. variolosum, Aulacaspis rosae, Carulaspis visci, Ceroplastes brevicauda, C. floridensis, C. helichrysi, C. destructor, Chionaspis pinifoliae, Chloropulvinaria floccifera, C. psidii, C. urbicola, Chrysomphalus dictyospermi, Coccus alpinus, C. capparidis, C. celatus, C. hesperidum, C. perlatus, C. proteae, C. pseudomagnoliarum, C. subhaemisphaericus, C. viridis, Diaspidiotus bavaricus, D. cecconii, D. gigas, D. labiatarum, Ericerus pela, Eriococcus agropyri, E. greeni, E. insignis, E. spuria, E. jorgensenii, Eucalymnatus tessellatus, Eulecanium douglasi, E. kunoense, E. rugulosum, E. secretum, E. tiliae, Filippia folicularis, Gossyparia spuria, Lecanium corni, L. prunastri, Lichtensia chilianthi, L. viburni, Luzulaspis luzulae, Parasaissetia litorea, P. nigra, Parthenolecanium corni, P. persicae, P. pomeranicum, P. rufulum, Phenacoccus manihoti, Protopulvinaria pyriformis, Pulvinaria acericola, P. aethiopica, P. convexa, P. elongata, P. flavescens, P. floccifera, P. iceryi, P. maxima, P. minuta, P. platensis, P. urbicola, P. vitis, Pulvinariella mesembryanthemi, Quadraspidiotus perniciosus, Q. zonatus, Rastrococcus mangiferae, Rhodococcus bulgariensis, R. perornatus, R. turanicus, Saissetia coffeae, S. nigrella, S. oleae, S. somereni, Sphaerolecanium prunastri, Stictolecanium sp., and Toumeyella liriodendri.