CYTOSKELETAL ORGANIZATION OF DISEMATOSTOMA-COLPIDIOIDES (CILIOPHORA, FRONTONIIDAE)

The cytoskeletal arrangement of Disematostoma colpidioides has been st udied by silver impregnation and permeabilization methods. The somatic cortex is supported by the epiplasm, kinetosomes and their fibrillar derivates, and by the outer and infraciliary lattices. The buccal cyto skeleton presents a more complicated structure. The right side is main ly maintained by nematodesmal bundles arising from the vestibular and paroral kineties, and microfibrillar tracts contribute to the maintena nce of this side. The left side is supported by the microfibrillar net s and the postciliary microtubules coming from the kinetosomes of the membranelles. The bottom of the buccal cavity is surrounded by the dee p net and postciliary microtubules of the peniculi, and by the filamen tous reticulum and nematodesmata belonging to the paroral infraciliatu re.