[Comparative karyotyping of our gibbon species or subspecies (author's transl)]

The karyotypes of several Hylobatidae Hylobates (Hylobates) lar pileatus, H. (Nomascus) concolor leucogenys, H. (N.) concolor ssp, Hybrid H. (N.) concolor leucogenys x H. (N.) concolor gabriellae, H (Symphalangus) syndactylus are compared both each others and also to those of other Primates. Many rearrangements of their chromosomes have occurred during their evolution, and some polymorphism still exists in the living species. This high rate of chromosome rearrangements is in contrast with their phenotypic stability. It is very likely that reciprocal translocations have occurred, these rearrangements being very rare in the evolution of other Primates.