Cytogenetic studies have been carried out in 39 specimens of C. apella of different origins. Three different morphologies, one affecting the long arm of chromosome 4 and two affecting pair 17, have been detected. In each case, they can be related by paracentric inversions. Heterochromatin polymorphisms affecting terminal or interstitial C + regions have also been observed. The length of the terminal heterochromatic region in the long arms of chromosome 11 is variable in C . apella sp., in C . a. paraguayanus and absent in the C . a. nigritus specimens studied. Interstitial C + bands can be observed in the long arms of the biarmed chromosomes 4 and 6, and in the long arms of the acrocentric pairs 12, 13, 17, 18, 19, 20, and 21.Interstitial C + bands in the long arms of chromosomes 4,12, 17, and 19are present in all animals studied, although their size is variable, especially in the case of chromosomes 17 and 19. o 1995 Wiley-Liss, Inc.
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