Geissmann, T. (1993). Evolution of Communication in Gibbons (Hylobatidae), PhD Dissertation, Anthropological Institute, Zurich University. Geissmann, T. (1995). Gibbon systematics and species identification. Int
On the inner side of the trap are present four-armed (quadrifid) and two-armed (bifid) hairs. In the outside part of the plant, there are dome-shaped external glands and closely arranged epithelial cells lining the threshold of the doorway. The evolution o...