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

The parasitic nematodes of small mammals in Mongolia are rather unknown, whereas there are numerous helmintological data from the surrounding areas, mostly from the Asiatic part of the U.S. S.R. Among the Mongolian data worthy of mentioning are SCHULZ'

s (194-8) Eugenuris schumakovitschi from Ochotona dauurica collected near Ulaan-Bator

,and Smirnovia gregori from Microtus brandti described by SCHULZ and ANDREEVA (1950). IVASHKIN (1954) studied the helminths of the Mongolian hares. In Lepus tolai he found Dermatoxys veligera (Rud., 1819), Miscipsella numicida (Seurat, 1917), and described Hematodirus petrovi

. Prom Lepus timidus he reported Trichuris leporis (Proelich, 1789). Pam.: Heteroxynematidae Skrjabin et Shikhobalova, 1948 1. Cephaluris andrejevi Schulz, 1948 (3 oo, 6 $9) Host: Ochotona dauurica dauurica Localization: caecum. Description: Two symmetrical dorsal structures consisting of cuticular lobes (shields) on the cephalic end. Lateral alae present. Mouth-opening surrounded by three lips, and two pairs of submedial and one pair of lateral papillae (Pigs. 1A, B, C). Three teeth in buccal cavity. Trahsversally ringed cuticlAMales: Body length 6.20-6.50 mm, maximum width 360-400 p. Esophagus length 570-730 ja. Nerve ring 130-180 ja, from anterior end. Lateral alae originating from cephalic shield and almost reaching posterior end of body.Tail length 300-460 u, tail with pointed end, ventrally curved. A knob-like outgrowth posterior to cloaca .Caudal papillae symmetrically situated (Pigs. ID, E). No spicule and no gubernaculum

. A cuticular comb of 450 p. long Pig. 1: Cephaluris andrejevi Schulz, 1948 (Orig.) A) Anterior extremity, en face view B) Anterior extremity, ventral view C) Anterior extremity, dorsal view D) Posterior extremity of male, ventral view E) Distribution of papillae on posterior end of male P) Posterior extremity of female, lateral view CU Egg.