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

mum width 1.2 mm, size of scolex 480x400 n,diameter of bothridia 310 yu, diameter of cirrus sac in young hermaphroditic segments 65 /U, ovary in same segments 200x35 p.)* Deposited in the Parasitological Collection of the Hungarian Natural History Museum, Budapest. Number of slide: 4478/a. Paratypes

: Tapolca, Lake Malom, Phoxinus phoxinus. 18 January 1966 - Slide 4465» 19 February I966 - Slide 4479, 25 March I966 - Slide 4468/a., 10 August 1966 - Slides 4474a, b, c, 3 November I966 - Slides 4478b, c, d, e. (10 slides of paratypes.) Deposited in the Parasitological Collection of the Hungarian Natural History Museum, Budapest. Discussion Our investigations imply that the two species studied are anatomically extremely close to each other. However, certain morphological features clearly proved that the specimens represent two distinct species. B. phoxini is a considerably smaller parasite, its body length does not exceed 45 mm even in the largest (7-8 cm long) Phoxinus phoxinus exemplars; B. gowkongensis may, however, reach 100 mm in young Cyprinus carpio and Ctenopharyngodon idellus specimens.- The number of segments in well developed B

. phoxini totals 80-110, while B. gowkongensis may possess up to 500-600 segment s . Though the scolex of the two species is similar, typical and consequent differences can be recognized in the structure of scolex of B. gowkongensis and B

. phoxini

. In B. gowkongensis the scolex is twice wider than thick, and thus the worm lies always laterally with its bothridia on the slide, that is, it turns ley 90° as compared with the plane of the segments, and recovers the natural position only after reimmersion in liquid (Fig. 3). The width and thickness of the scolex of B. phoxini are nearly equal (5^4), thus the scolex lies in its natural position on the microscopic slide, i. e. the bothridia are situa105