| Abstrakt: |
Mature polycercus larvae of Paricterotaenia paradoxawere examined by light and electron microscopy. Although the larvae are of the cysticercoid type, they showed great similarity to the hydatid larvae of Echinococcus granulosuswith respect to asexual multiplication and the presence of a PAS-positive layer of tissue that surrounds the larva. The microtriches were found to be of three different forms depending on their location. Two types of secretory products are described, one apparently associated with hook formation and the other apparently neurosecretory, associated with the extensive musculature. The suckers were found to be discrete organs covered by the scolex tegument and enclosed by a membrane contiguous with the basal lamina. The present findings of this unusual type of cestode larva are compared to the more normal cysticercoid and cysticercus larvae described by other workers. |
