Abstract
We carried out an in vitro histological and TEM investigation of the organization of the interna of Peltogasterella gracilis(Crustacea: Rhizocephala), a parasite of the hermit crab. The colonial interna of P. gracilisincludes a reproductive system with multiple nuclei (externa rudiments) and a trophic system of absorbing lampbrush and transportation canals. The nucleus forms a cluster of embryonic stem cells. In the distal parts of the trophic system, there are cells that function in the absorption, processing, and storage of trophic substances. Cells filled with trophic resources disintegrate (evidently by apoptosis), releasing trophic substances and cell remnants into the canal cavity formed through this process. The parasitic phase of the P. gracilislife cycle is characterized by the loss of the basic morphological features and complete pattern of organization of the arthropods and by chaos and fractalization in the interna.
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