[A histochemical study of the nervous system in trematode parthenitae]

Localization of catecholamines in the nervous system of 12 species of Trematodes parthenitae from marine mollusks has been studied using the method of glyoxilic acid-induced fluorescence. Unlike primitive species with orthogon-like distribution of catecholamines, specialized ones have diffuse nervous plexus, which can be reduced in most specialized forms.