Stored product psocids (Psocoptera): External morphology of eggs

Eggs of thirteen synanthrophic psocids of the families Trogiidae, Psyllipsocidae, Liposcelididae and Lachesillidae, commonly occurring in stored products in Europe, are described. Descriptions are based on overall appearance during embryogenesis, size and surface sculpturing. Morphological details are illustrated using scanning electron micrographs. A key for distinguishing eggs at both the generic and species level is provided. The presence or absence of a micropyle and aeropyle is discussed.