Dr. Kassai Tibor - Dr. Murai Éva szerk.: Parasitologia Hungarica 10. (Budapest, 1977)

Female: Body length 2.80-3.20 mm, maximum width 0.060-0.070 mm. Esophagus length 0.350.40 mm. Nerve ring 0.17-0.20 mm, excretory pore 0.20-0.22 mm from anterior end. Vulva 0. 090-0. 012 mm from posterior end. Eggs 0, 068-0. 085 mm long by 0. 037-0. 053 mm wide. Tail length 0. 030-0. 035 mm. Tail with two small lateral papillae on tip. Species of genus Boreostrongylus Durette-Desset, 1971 are Holarctic parasitizing in Microtidae and Gerbillidae. B. minutus restricted to the Palaearctic region. France: DURETTE-DESSET (1967) P. subterraneus; German Federal Republic: STAMMER (1956) L. wolgaense ? - C. glareolus, M. arvalis, M. agrestis, A. terrestris, P. subterraneus; Poland: FURMAGA (1957) Longistriata (L. ) beta ? - M. raticeps; Czechoslovakia: ERHARDOVÁ (1956) M. agrestis; TENORA et al. (1974) P. subterraneus, Rumania: CHIRIAC and HAMAR (1966) A. terrestris; Bulgaria: KARAPCANSKI et al. (1969) A. sylvaticus, A. terrestris; Soviet Union: SCHULZ (1926) A. terrestris; MOZGOVOJ et al. (1966) A. terrestris, M. agrestis; summarized data were published by MERKUSHEVA (1972); Israel: WERTHEIM and DURETTE-DESSET (1975) M. guentheri; 5. Syphacia nigeriana Baylis, 1928; Fig. 5 A-C For distribution in Hungary see the Table and Fig. 1. - Localization: caecum. - Extensity 28.7%, intensity 1-60.specimens. Rounded off anterior end with four submedial papillae and two amphids. Mouth opening surrounded by three lips. Distance between two amphids 0.037-0. 040 mm in females. Cervical alae absent, lateral-alae narrow. Finely, transversely striate cuticle. Inner surface of esophagus serrated. Male: Body length 1.50-2.00 mm, maximum width 0,14-0.16 mm. Esophagus length 0.23-0. 26. Nerve ring 0. 10-0. 12 mm, excretory pore 0. 25-0. 38 mm from anterior end. Ventral part of body with three big transversely striate papiUae. Body with ventrally coiled posterior end. Tail length 0. 15-0. 16 mm. Cloaca margined by one pair praeanal, one pair anal, and one pair postanal papillae. Spicule slender, 0.070-0.076 mm long. Gubernaculum length 0.0270. 031 mm. Female: Body length 3. 10-5. 40 mm, maximum width 0. 25-0. 36 mm. Esophagus length 0. 340,40 mm. Nerve ring 0.15-0.19 mm, excretory pore 0.40-0.54 mm from anterior end. Distance between anterior end and vulva 0, 65-0,80 mm. Tail length 0. 56-0.70 mm. Eggs loafshaped, 0. 093-0. 123 mm long by 0. 028-0. 037 mm wide. Before the publication of QUENTIN' s (1971) fundamental work - in which the structure of the anterior end and that of sexual organs received special attention - from M, arvalis almost all authors mentioned S. obvelata (Rud., 1802). QUENTIN was the first who showed that S. ob- velata is primarily the parasite of M. musculus, while S. nigeriana harbours M. arvalis. Further studies were conducted on more extensive material by SHARPILO (1973) and TENORA and MÉSZÁROS (1975). Regarding distributional data listed below, again, in most cases the actual and valid species name corresponding to S. obvelata of the original publications can not be stated with certainity

. Here also, these are marked by a question-mark. Africa: QUENTIN (1971) Hylomyscus atella, Lemniscomys striatus, Mastomys sp. , Praomys jacksoni, P. morio, Stachorrjys longicaudatus, Gerbillus campestris;