|Bornean White-bearded Gibbon (Hylobates albibarbis)|
Primate Info Net (University of Wisconsin) Photo Credit Marilyn Cole
Most of his figures are of a gibbon identified as Hylobates concolor (Harlan) from Borneo. The species name is still in use for Nomascus concolor, which is not found on Borneo. I now know, thanks to Dr. Thomas Geissman and his remarkable web site, that this reflects an extraordinary comedy of errors. Harlan described his ape as a hermaphrodite orangutan from Borneo; in fact it was a juvenile gibbon from Indochina!
|Geographical distribution of gibbons.|
(C) 2010 Thinh et al.
|Early stage of pregnancy in Hylobates albibarbis with amnion (A), yolk sac (D) and|
exocoelom (Ex). The specimen had been flattened by contraction of the uterus but
the decidua capsularis (Dc) is clearly seen.