EN
The presence of catecholamines in the nervous system of a plagiorchiid cercaria of Opisthioglyphe ranae (Frölich, 1791) is demonstrated using fluorescence methods (SPG method after De la Torre and Surgeon 1976, exciting filter of 400-410 nm max. wave length). Comparison of the distribution of catecholamines and acetylcholinesterases in the cercaria of the same species showed closely similar patterns. However, some differences in distribution were identified and these are discussed.