[Ultrastructure of the surface sculpture of the nematodes Thelazia gulosa and Thelazia rhodesi]. / Ultrastruktúra povrchových skulptúr nematód Thelazia gulosa a Thelazia rhodesi.

An electron-microscope study of the cuticle of two thelazia species revealed very interesting architectonics of the sculpture of the body surface of these nematodes. The surface layer of the cuticle is crosswise and lengthwise ridged. While certain uniformity of the shape and distribution of the surface structures can be seen in Thelazia gulosa, the case is contrary in Thelazia rhodesi. The ridges and projections of the cuticle have different structure and incidence in particular thirds of the nematode body. This unusually formed structure of body surface, which is found in thelazia, complies with the fixation and locomotion of these nematodes at the exacting place of their parasitizing--in the host's eye.

A comparative study of the ultrastructure of intestine in Protostrongylus commutatus and Protostrongylus rufescens (Protostrongylidae: Nematoda).

A comparison of the ultrastructure of intestinal cells of two taxonomically very close nematode species, Protostrongylus commutatus and Protostrongylus rufescens, revealed many interesting facts. The concentration of mitochondria in the basal part of intestinal cells, which is conspicuous particularly in P. rufescens, indicates that the nutrients penetrate also through the cuticle. An enormous occurrence of granular endoplasmic reticulum in the intestinal cells of P. commutatus shows an excessive protein synthesis. It may be supposed that the proteins will be used mainly for the construction of sex products, which are extremely abundant in P. commutatus. This phenomenon will be related with the conditions of egg development and localization of the worm in the vicinity of trachea bifurcation in the lungs of hare.

Scanning electron microscopic study of Mammomonogamus laryngeus.

Surface structures, particularly numerous body sculptures of the nematode M. laryngeus recovered from cattle in Cuba were studied by scanning electron microscopy. New morphological structures in form of "granulations" were found of the mouth capsule. The structure of cuticle in region of vulva opening and of bursa cuticle was described in detail. It was found that even older preserved material of helminths can be used for SEM studies.

Ultrastructure of intestinal cells of Heterakis gallinarum.

Ultrastructure of intestinal cells of Heterakis gallinarum is described and compared with that of Ascaridia galli from ecomorphological point of view. The great analogy in bionomy and ecology of both worms is reflected in the great analogy of ultrastructural construction. A new organoid in the intestinal cells of H. gallinarum, hitherto unknown among nematodes, is also described. It is of a vacuole-like shape running in stripes close under the terminal bar. The paper is also meant to be a supplement to the authors' previous paper (1975) dealing with ultrastructure of muscle cells of Heterakis gallinarum.