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Relationships between the Species of Fasciola and their Molluscan Hosts

1970; Elsevier BV; Linguagem: Inglês

10.1016/s0065-308x(08)60256-0

2163-6079

S.B. Kendall,

Parasite Biology and Host Interactions

The knowledge of the snail hosts of both Fasciola hepatica (F. hepatica) and F. gigantica have confirmed that the former is an amphibious animal best adjusted to temporary habitats and the latter as being truly aquatic. Different vectors of FascioIa hepatica and Fasciola gigantica are discussed in this chapter. Lymnaea tomentosa (L. tomentosa) is found to be the only vector of Fasciola that is tolerant to a wide range of temperatures and resistant to low temperatures. Under specific conditions, the areas where cattle and L. natalensis occur together are fairly restricted and the grazing habits of the local breeds of sheep and goats are not likely to put them in major danger. Miracidia takes longer to penetrate L. rufescens than L. natalensis, the normal snail host of the strain of F. gigantica. Evidence from the dissection of whole snails and from the examination of tissue sections indicates that the number and sizes of sporocysts developing in the two species of snails are comparable but that there is considerable difference in the development of the rediae. Dissection of snails shows a decreasing incidence of sporocysts of the xiphidiocercaria.