BackgroundEchinostomes are cosmopolitan digenean parasites which infect many different warm-blooded hosts. Their classification is extremely confused; the host spectrum is wide, and morphological similarities often result in misidentification. During our long-term studies on the helminth fauna of rodents and carnivores we have collected 27 collar-spined echinostomes which differ in morphology to an extent that suggests the presence of more than one species. Here, we describe this material, and the extent of host-related variation in this parasite.MethodsSpecimens of Isthmiophora isolated from four host species (badger, American mink, hedgehog, striped field mouse) were subject to morphological and molecular examination; the data were statistically analysed.ResultsOur results show that genetically all the Isthmiophora specimens obtained from all the examined hosts are conspecific and represent I. melis. On the other hand, the individuals isolated from Apodemus agrarius are morphologically distinct and, based on this criterion alone, should be described as a new species.ConclusionsThe morphological traits of Isthmiophora melis are much variable and host-dependent; without molecular analysis they would suggest a necessity to describe a new species or even genus. Such a high level of intraspecific variability may be affected by the host’s longevity.

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SummaryParasitic infections are widespread among exotic lizards and cause serious problems in both private captive breeding and trade networks. Among 168 lizards obtained from captive breeding (Zoological Garden in Wrocław and private owners) and trade (pet shops and wholesale) the total prevalence of endoparasites was 42.35 %. We detected species of Protozoa, Cestoda, Trematoda -Digenea and Nematoda as well as pseudoparasites. The prevalence of endoparasites was higher in the reptiles obtained from captive breeding (59.5 %) than in those from trade network, however the parasite species spectrum was wider in the animals form pet shops and wholesales.