Boros István (szerk.): A Magyar Természettudományi Múzeum évkönyve 52. (Budapest 1960)

Berinkey, L.: Further morphological and osteological investigations on the hybrids of Hungarian Cyprinids

Table II. Body measurements of the parental species and the hybrids Measurements of Scardinius erythroph I halmus Means of Rutilus r utilus No. 1. Scardinius er\throf x Rutilis ru 2. J 3. kthalmus tilus 4. Mean long, corporis (mm.) 121,3 101,0 105,1 86,8 in % long. corp. alt. corporis 35,0 31,5 33,8 30,4 31,4 30,4 31,4 alt. capitis 19,0 17,9 18,2 17,7 18,2 18,4 18,1 dist. predorsalis 60,0 52,8 61,5 58,0 60,0 60,7 59,8 dist. P.-V 25,5 25,7 24,5 25,4 24,8 22,7 24,3 long. ped. caud 19,2 19,3 17,5 19,9 19,2 18,6 18,7 10,5 10,3 11,0 9,60 10,5 10,1 10,1 12,9 15,8 12,4 12,6 11,4 12,0 12,1 alt. D 19,2 21,5 18,4 21,7 20,2 21,9 20,5 15,2 12,3 12,7 13,0 12,9 13,7 13,1 alt. A 15,7 14,9 17,6 16,4 17,3 17,2 17,1 20,2 17,0 19,2 20,9 20,0 20,5 20,1 long. \

. . . . 17,7 16,4 19,0 19,2 17,2 19,8 18,8 in % long, capitis dist. preorbitalis 28,6 24,1 25,4 27,6 24,7 26,2 25,9 45,9 49,9 46,3 45,1 47,8 45,3 46,2 diameter oculi 26,5 24,5 28,6 28,4 29,4 30,4 29,1 40,5 38,5 38,0 37,6 37,0 37,8 37,6 Comparing the average values of the Table, it can be established that there are 8 features in which the parents differ considerably. These are the following : the elevation of the body is 35,0 and 31,5%, the hybrids having 31,4%, agreeing thereby with the roach ; the greatest difference between the parents is in the predorsal distance, this being 60,0 and 52,8%, the hybrids are wholly of a rudd character with their 59,8% ; this and the shape of the mouth are the most conspicuous features of the hybrids. The base of D. is 12,9 and 15,8%, here again the hybrids show a rudd character (12,1%); the height of D.is 19,2 and 21,5% (rather close values between the parents, therefore the determination of the character of the hybrids is also somewhat uncertain), their average 20,5% is transitionary ; the base of A. is 15,2, and 12,3%, the 13,1% of the hybrids lies quite near to that of the roach ; the length of P. is 20,2 and 17,0%, here a rudd feature prevails in the hybrids (20,1%) ; the preorbital distances are rather far off from each other in the parents : 28,6 and 24,1%, the hybrids show a transitionary 25,9% ; the postorbital distance is 45,9 and 49,9%, with the rudd character dominating in the hybrids (46,2%) ; finally, the values of the eye-diameters are higher in the hybrids than in both of the parents, and thus we cannot evaluate them. Summarizing the morphological features, the rudd character dominates in 4 cases in the hybrids, the roach characters in 2 cases, and there are transitional values in 2 cases. We have yet to discuss the shape of the scales. They rather resemble each other in the parents, the essential difference showing in the fact that the oral and caudal parts are of a uniform size on the scale of the rudd, while the caudal