The Life History of Nematodirus helvetianus May, 1920, a Nematode Parasitic in Cattle

Abstract

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Development of Nematodirus spathiger (Nematoda, Molineoidea) in the rabbit and comparison with other Nematodirus spp parasites of ruminants

“…1, part 13). However, it is not possible to know whether the dorsal and ventral tips are double or not, since Herlich (1954) did not provide a drawing in median view. In N. filicollis (according to Boulenger 1915; Fig.…”

“…Compared with the location of Nematodiroides zembrae, a native parasite in the rabbit (Audebert et al 2002), Nematodirus spathiger, a non-native parasite in (Beveridge et al 1985), N. filicollis in calf (Thomas 1959a), N. helvetianus in calf (Herlich 1954), N. spathiger in sheep (Kates and Turner 1955) and in rabbit (this work) and N. battus in sheep (Mapes and Coop 1972) and in rabbit (Gallie 1972) the rabbit, was located more posteriorly in the small intestine of the host. This posterior location of N. spathiger can result from an adaptation caused by some difference in the chemical environment (pH, more or less mucus, bile salts) between the small intestine of the rabbit and that of the sheep.…”

“…Most of the data about the morphogenesis of the parasitic stages of species of the genus Nematodirus were described by Beveridge et al (1985) for N. abnormalis, by Thomas (1957Thomas ( , 1959a and Mapes and Coop (1972) for N. battus, by Boulenger (1915) and Thomas (1957Thomas ( , 1959a for N. fillicollis, by Herlich (1954) for N. helvetianus and by Boulenger (1915), Dickmans and Andrews (1933), Kates and Turner (1955) and Thomas (1957) for N. spathiger. Our results for N. spathiger bring complements on the head, tail and synlophe of this species and also on the genus Nematodirus for which only the head and synlophe of N. abnormalis were described by Beveridge et al (1985).…”

“…To date, the life cycles of five species of the genus Nematodirus have been realized in their respective natural host: three in the sheep [N. abnormalis (Beveridge et al 1985), N. battus (Mapes and Coop 1972), N. spathiger (Kates and Turner 1955)] and two in the calf [N. filicollis (Thomas 1959a), N. helvetianus (Herlich 1954)]. According to our previous hypotheses, these life cycles can be classified as follows, taking into account their degree of adaptation to their host:…”

“…The life cycles of five species of the genus Nematodirus have been studied in their natural host, the sheep for N. abnormalis (Beveridge et al 1985), N. battus (Thomas 1957(Thomas , 1959a(Thomas , 1959b and N. spathiger (Kates and Turner 1955) and the calf for N. helvetianus (Herlich 1954) and N. filicollis (Thomas 1959a(Thomas , 1959b. Nevertheless, the study of these life cycles in an experimental host has been realized only for N. battus (Gallie 1972(Gallie , 1973a(Gallie , 1973b.…”