Dr. Murai Éva szerk.: Parasitologia Hungarica 23. (Budapest, 1990)

RESULTS Twenty-two Dactylogyrus, 1 Ancyrocephalus and 1 Dogelius spp. (Table 1) were found on the fishes examined. Of these parasites nine Dactylogyrus spp. were identified only to genus. The latter seem to be new for the science, and their detailed description will be the subject of another paper. Both the Dactylogyrus spp. and Ancyrocephalus paradoxus, a common parasite of the pike-perch were first recorded from Iran. A Dogelius sp. infecting Aspius vorax Heckel proved to be new for the science, and its description is as follows: Dogelius mokhayeri sp. n. (Fig. 1.) Host and locality: Aspius vorax Heckel, River Dez, Gulf basin. Specimens studied: 2. Description: Body moderately elongated. Haptor subquadrate. Four eyespots present. Anchors with relatively developed outer and less developed inner roots (Fig. 2). The points of the anchors open with well emphasized blades. Copulatory complex consists of a slightly bent sclerotized cirrus and a complicated accessory piece. Measurements in micrometer: Body 300-400 long and 80-86 wide. Ventroapical length of the anchors 42.544, dorsoapical length 31-34. Inner roots 3.5-4, outer roots 8-9. The blade of the tip of the anchors 8.5. Transversal length of the bar 42.5, width 4-5 in the middle and 9-10 at the ends. Hooks measure 20.5-24. Cirrus 30.5, accessory piece 30 long (Fig. 3). Remarks: The species resembles the typical Dogelius spp. by having the characteristic blades on the anchors, but differs from the known species in the shape of the roots and construction of the copulatory complex. DISCUSSION The results obtained during this study show that fish species common in Europe and in the Asian part of the Soviet Union have the same parasites in Iranian waters, too. Fishes not belonging to the Caspian region are, however, infected by monogeneans not recorded until now. Relatively few Dogelius species have been recorded so far. According to GUSSEV (1985) 11 species are known. They infect Schizothorax (BYCHOWSKY 1957), Varicorchinus, Labeo and Catla (GUSSEV 1973-74) and Barbus (PAPERNA 1973) spp. The occurrence of a Dogelius sp. on Aspius vorax is recorded for the first time and it proves to be new for the science.