THE KARYOTYPES OF CALICOPHORON-MICROBOTHRIUM AND CARMYERIUS-GREGARIUSFROM EGYPTIAN RUMINANTS

The karyotypes of the two amphistomes Calicophoron microbothrium Fisch oeder, 1901 and Carmyerius gregarius (Looss, 1896), Stiles and Goldber ger, 1910 from Egyptian ruminants were studied using the air drying te chnique. The two species have similar number of chromosomes (n = 9), b ut differ in chromosome morphology. All the chromosomes of C. microbot hrium are subtelocentric, except the first and the fifth are metacentr ic, whereas the chromosomes of C. gregarius are submetacentric, subtel ocentric and acrocentric. Some cells in the two species showed tetrapl oidy. The results are discussed in terms of the phylogenetic relations hip of different amphistomes.