Dr. Kassai Tibor - Dr. Murai Éva szerk.: Parasitologia Hungarica 7. (Budapest, 1974)

Integument

um from area of oral sucker to level of front testis covered with spines. Generic feature: the large pharynx, in every case larger than the oral sucker. In Table 2 data concerning P. pharyngeatum

, given by authors not cited in MERKUSHEVA

'

s (1959) work, and data of MÜHLING*

s (1898) original description of P.simillimum

, and those of GRABDA (1954) are compared. ERHARD0VÁ(1958) does not give the exact measurements of the oral sucker, but she remarks that the pharynx is larger than the oral sucker. The measurements of the other organs concur with those of P. simillimum

. The identification of the species published by POJMANSKA (1957) under the name P

. pharyngeatum Grabda, 1954, is more problematic. According to POJMANSKA the pharynx of this species is smaller than the oral sucker. In this case, the identification of this species as P

. pharyngeatum can not be correct, because in GRABDA*

s original description the ratio of the two organs is inverse. But the figure given by POJMANSKA shows that the pharynx is larger than the oral sucker. The ratio of the pharynx and oral sucker is 2:1 in the figure. Accordingly, it seems highly probable that the fluke species published by POJMANSKA is identical with P. simillimum (syn. P. pharyngeatum)

. Also the species published by EDELÉNYI (1966) from Hungary is problematic. Namely, the author publishes neither measurements of the oral sucker, nor the sucker in the figure, but submits only an enlarged kettle-shaped prepharynx. If the muscular oral sucker is in fact lacking,then the fluke, collected from Microtus agrestis, can by no means be relegated to the genus Psilo trema , but may perhaps represent a species of the genus Psilo- stomum (

Psilostomum ondatrae ?). Unfortunately, the fluke was found only in one exemplar and it is not available for examination, thus the problem can not be clarified. Psilotrema spiculigerum (Mühling, 1898) - Pig. 3 Host: Ondatra zibethica; Locality: Lake Fertő. Localization: small intestine; Intensity: 3 specimens.