THE NERVOUS-SYSTEM OF POLYSTOMA-INDICUM (MONOGENEA, POLYSTOMATIDAE) AS REVEALED BY NONSPECIFIC ESTERASE LOCALIZATION

Using the localization of nonspecific esterases, the nervous system of Polystoma indicum Diengdoh et Tandon, 1991 could be revealed in toro. The nervous system is bilaterally symmetrical. Cerebral ganglia, whic h are connected by a thick dorsal commissure, are present dorsal to th e pharynx. From the cerebral ganglia arise five anterior pairs and fou r posterior pairs of nerve trunks. The anterior nerves and/or their fi ne branches join to form a conspicuous circumoral nerve ring complex. The posterior nerves unite in the opisthaptoral region to form two mai n haptoral nerves, the branches from which innervate the components of the opisthaptor. Presence of nerve cells is also revealed in associat ion with the main nerves, more predominantly in the vicinity of the op isthaptoral suckers.