Abstract
Approximately 1000 specimens representing more than 30 species and strains of the family Steinernematidae, from Australia, North and South America and Europe were investigated by scanning electron microscopy to determine the structure of the lateral field of the infective juveniles. Although fixation and critical point drying may cause distortion of the ridges of the lateral field, three basic types of arrangement could be observed. Six ridges were present on Steinernema affinis and S. intermedia; seven ridges were present in most species and strains from forest-ecosystems (i.e. S. kraussei) and eight ridges were present in species and strains from agroecosystems (i.e. S. bibionis and S. carpocapsae).
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