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Redescription of Chronogaster boettgerii Kischke, 1956 is provided. The male of this species was found for the first time, and herein is described and illustrated. Chronogaster boettgeri Kischke, 1956 is distinguished by its amphids circular at the surface and forming a single spiral with a dorsal break, presence of 3 caudal glands arranged in tandem, absence of lateral longitudinal lines, lack of vacuolated lateral glandular bodies, tail tip of female with single, almost ventral and straight mucro; male is distinguished by tail terminus devoid of mucro and absence of tuboid preanal supplements.
Parastrongyloides trichosuri Mackerras, 1959 is one of the most common parasites of Australian possum Trichosurus vulpecula and is considered a candidate for biological control of brushtail possums in New Zealand. Infective larvae of P. trichosuri penetrate the skin of possums and develop in the small intestine into males and females. Adult females produce eggs giving rise to free-living males and females. In most cases the progeny of the free-living adults develop into filariform infective larvae. Frequent aeration of faecal cultures and a temperature range of 23-26°C seems to be important for the development of free-living adults and filariform infective larvae. Infective larvae have limited ability to migrate and do not survive long when exposed to sun or dessication. They avoid intensive light but respond positively to dispersed light. Infective larvae responded positively to increased (up to 39°C) temperature and water movement.
Onchocerca jakutensis was noted inside nodules situated in subcutaneous connective tissue of red deer shot in forests of the region of Olsztyn and in the Lower-Silesian Forest. The paper contains a redescription of this species on the basis of materials from Poland and the Caucasus.
Traditional classification of the nematodes, based on morphological-ecological characters was evaluated in the context of molecular analysis of systematic taxons, with special regards to ascarids. Division of superfamily Ascaridoidea into 4 families (Heterocheilidae, Ascarididae, Anisakidae, Raphidascarididae) proposed by Fagerhholm (1991) seems to be proved by the molecular data of Nadler (1992, 1995) and Nadler & Hudspeth (1998).
The fine surface topography of Oesophagostomum columbianum and O. aspersum, the predominant nematode species of goats in India, has been studied by means of SEM. In O. columbianum the anterior end is bent like a hook; the cephalic vesicle is marked behind by a groove; the lateral alae are present throughout the anterior extremity thereby providing a dorsal curvature to the body; the external corona radiata is seen to consist of 20 elements; and the spicules are long and seen as twisted upon each other. In O. aspersion the external corona radiata comprises 12 elements; the vulva and the anus lie behind a constriction at the posterior extremity and quite close to one another. Characters, such as the amphids, cephalic papillae, prebursal papillae, etc., are elucidated for both species.
A new species of Mylonchulus Cobb, 1916 is described from Ukraine. Mylonchulus politus sp. nov. is similar to M. andrassyi Loof, 1993 from which it differs by shorter (L = 0.78-1.00 mm vs > 1.00 mm) and relatively wider (a = 26-35 vs a = 35-40) body, smaller buccal cavity (14-19 µm long vs > 20 µm long), shorter tail (28-37 µm vs > 50 µm), shorter spicules in males (32-35 µm vs > 40 µm), vulval lips sclerotization (rectangular vs triangular pieces), longer posterior uterine sac (75-122 µm vs 32 µm).
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Prionchulus hygrophilus sp. nov. and P. bogdanowiczi sp. nov. are described based on the material collected from Ukraine and Taiwan.
A research on the nematofauna of Vaccinia myrtilli-Pinetwn pine forests has been done in four forest areas located in different zoogeographical regions of Poland. Species composition, constancy, density and dominance structure of Nematoda communities have been analysed. 49 Nematoda species have been identified. 5 of which were not previously recorded in Poland.
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