Dr. Murai Éva - Gubányi András szerk.: Parasitologia Hungarica 29-30. (Budapest, 1997)

Crenosoma melesi Jancev et Genov, 1988 Localities: provinces of B, BU and L. Prevalence: 3.0%. Invasion intensity: 1 - 10 C. melesi was recovered from the respiratory system. Its determination was based on the original report (Jancev and Genov 1988). These authors, apart from describing the new species, did clearly specify their distinctive characters with respect to Crenosoma spp., which are also parasitizing Mustelids. Filaroides martis (Werner, 1783) Localities: provinces of AV, B, C, CR and PO. Prevalence: 3.0%>. Invasion intensity: 1 - 2 (nodules) Some nematodes living inside of parasitic nodules in the bronchi belonged to the species Filaroides martis. Their determination was mainly based on the morphology and morphometry of some males and on the already existing references (Lopez-Neyra 1947, Anderson 1962 and 1963). Skrjabingylus nasicola (Leuckart, 1842) Locality: province of Barcelona (B). Prevalence: 37.5% (n=8). Invasion intensity: 1 - 14. The helminths isolated from the frontal sinus of three weasels, coming from the Montseny Massif, were identified as Skrjabyngylus nasicola. Its particular habitat and the morphological descriptions of the species (Lankester 1983, Gerard and Barrât 1986) were helpful in the identification. Mastophorus muris (Gmelin, 1790) Localities: provinces of B and Z. Prevalence: 2.4%>. Invasion intensity: 1 -2. The stomach nematode M. muris appeared sporadically. Its identification was based on the papers of Wertheim (1962) and Quentin (1970). Based on our results, M. nivalis has to be added to the Iberian Carnivores (Vulpes vulpes, Mêles mêles, Mustela erminea, M. putorius, Martes foina, Genetta genetta and Felis silvestris), which slightly but constantly are parasitized by the Spirocercid in Iberia (Feliu et al. 1991, Motje 1995, Torres et al. unpublished data). The ecological results obtained from the whole sample and from the different subpopulations are detailed in the Table 1. DISCUSSION M. nivalis is a representative of the Mustela genus, which shows a high population density and a wide distribution all over Spain. In contrast with other mammals, the Iberian Peninsula does not constitute the southern border of its Palearctic distribution. The helminth fauna of M nivalis mainly consists of the members of parasitic community occurring in all the representatives of the genus in Iberia (Motje 1995). In some Mustela hosts the parasitic community structure appears to be modified by helminths with specific ecology. That would be the case of the Digenetic Euryhelmissquamula (Rudolphi, 1819), which parasitizes semiaquatic hosts, such as M. putorius and M. lutreola (Feliu et al. 1992, Motje 1995). In some other cases, as in the case of the stoat, a parasitic impoverishment occurs as a consequence of the population isolation found in the north-west area. Moreover, the Peninsula is the southern border of the European distribution of M. erminea (Feliu et al. 1991).