L. Forró szerk.: Miscellanea Zoologica Hungarica 8. 1993 (Budapest, 1993)

Biserkov, V. Y., Mészáros, F. , Genov, T.; Chipev, N.: The synlophe of Dessetia moldovensis (Andreiko, 1963) (Trichostrongyloidea, Heligmosomidae), from the lesser mole rat, Spalax leucodon Nordmann, (Rodentia, Spalacidae)

MISCELLANEA ZOOLOGICA HUNGARICA Tomus 8. 1993 p. 5-9 The synlophe of Dessetia moldovensis (Andreiko, 1963) (TVichostrongyloidea, Heligmosomidae), from the lesser mole rat, Spalax leucodon Nordmann, (Rodentia, Spalacidae) by VY. Biserkov, F. Mészáros, T. Genov and N. Chipev (Received June 10, 1993) Abstract: The synlophe of Dessetia moldovensis, which is the only species in the genus Dessetia, parasite of Spalax leucodon, is redescribed. The axis of orientation of the synlophe forms an angle of about 70° with the sagittal axis in the middle of the body in both sexes; number of ridges is 11. Maximum number of ridges in both sexes is 16, but they may be observed only before the vulva and before the bursa respectively, where all ridges are with similar dimensions. Key words: Dessetia moldovensis (Nematoda: Heligmosomidae), synlophe morphology, redescription, Spalax leucodon (Rodentia), Hungary, Bulgaria Introduction Comparing descriptions of the synlophe of Dessetia moldovensis (Andreiko, 1963), the only species in the genus Dessetia, after Genov & Yanchev (1981) and Genov (1984) on the one hand, and Fig. 10.226 in Durette-Desset (1983) on the other hand, we found difference of 90° in the inclination of the orientation axis of ridges with respect to the sagittal axis. This difference, as well as the insufficient information presented in the descriptions, stimulated the redescription of synlophe of Dessetia moldovensis in this paper. Material and methods The investigation is based on 2 female specimens collected from Spalax leucodon near Hajdubagos, Hungary, and 3 male and 3 female specimens from S. leucodon captured near Varna, Bulgaria. Cross sections were made from 5 female and 3 male specimens with simple device fixed to a stereomicroscope. The device consists of a stand and an arm with a fragment of a razor blade fixed to it. The sections obtained this way were about 25 thick. The sections were mounted on slides in dehydrated glycerol with paraffin ring (Maeseneer & D'Herde 1963). These slides could be studied by immersion. The slides of the studied specimens are deposited in the Collection of the Hungarian Natural History Museum, Budapest and in the Collection of the Institute of Parasitology, Bulgarian Academy of Sciences (IPBAS).