Dr. Kassai Tibor - Dr. Murai Éva szerk.: Parasitologia Hungarica 6. (Budapest, 1973)

Systematic and Taxonomy Hymenolepis horrida (Linstow, 1901) Hosts and localities: Clethrionomya glareolua (County Veszprém: Bakony Hilla-Iharkút, Szentgál, Balatoncaicaó; County Vaa: Őriszentpéter; County Sopron: Brennbergbánya; County Fejér: AgárdLake Velence); Pitymys subterraneus (County Vas: Őriszentpéter; County Pest: Pilisborosjenő); Microtus arvalis (Őriszentpéter, Pilisborosjenő). Extensity and intensity of invasion: C. glareolus 11.8 %, 1-6 specimens, P. subterraneus 12.5$- 6 specimens, M. arvalis 1 %, 1-3 specimens. Description: (based on individuals from P. subterraneus). The tapeworms are 30-60 mm long, 1-1.2 mm broad. The scolex bears neither spines nor hooks, and it measures 260-280 x 180-190 xx in diameter. It is provided with 4 conspicuous suckers of 158170 x 135-140 u in diameter. The rostellar sac is not present. Fully developed hermaphrodite segments are 900 p. wide and 110 xx high. Each segment bears three teatea meaauring 160 x 68 u. Two are aituated aporal above each other , the third poral

. The lobate ovary (420 x 78 /a) lie a between the poral and aporal testes. The yolk gland (177 x 40 xx) is situated below it. The bursa cirri of hermaphrodite segments measures 170 x 30 ;u, and it is provided with a cirrus bearing fine spines (Fig. lc). The lateral excretion outlets measure 93 p- in diameter. The eggs are oval-elongated with a very fine cover. The oncosphere of limetta-shape is provided with 6 hooklets. Eggs 63-75 x 30-40 ;u, oncosphere 37-45 x 13 M$ oncosphere hooklets 8-9 xx. The dimensions of H. horrida individuals found in CI. glareolus and M. arvalis are within those from P. subterraneus individuals . Discussion The species H. horrida was described by LINSTOW (1901) from 112