Oustalet colobus monkey
| Oustalet colobus monkey | ||||||||||||
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| Piliocolobus oustaleti | ||||||||||||
| Trouessart , 1906 |
The Oustalet colobus monkey ( Piliocolobus oustaleti ) is a primate species from the group of colobus monkeys that occurs in the northern Congo Basin between the Sangha in the west, the Congo in the south, the Ubangi and Mbomou in the north and Lake Albert in the east.
features
The Oustalet colobus monkey is one of the larger Central African red colobus monkeys and reaches a head-trunk length of 46 to 68 cm (males) or 52 to 64 cm (females) and an average weight of 12.5 kg (males) or 8.2 kg (females). The tail is relatively short with a length of 68 to 73 cm (males) or 55.5 to 73 cm (females). The hair on the top of the head is longer and forms a tuft of hair, which is shorter than that of the Thollon colobus monkey ( P. tholloni ). The fur on the back, the outside of the limbs and the top of the head are smoky brown or brownish-beige. The chest, abdomen, and insides of the limbs are light, whitish, or bright red. Hands and feet are dark to black. The species is very variable in color. The animals on the Lobaye in the Central African Republic are sienna-colored , their belly is described as golden and the base of the tail is copper-colored. The Oustalet colobus monkeys on the Uelle are lighter with very light, brownish-beige arms and legs and contrasting very dark hands and feet. Both in the extreme west of the distribution area and in the extreme east on the borders of the Ituri rainforest there are strongly reddish Oustalet colobus monkeys. The animals in the east may result from hybridizations with the Lualaba colobus monkey ( P. langi ) and the Semliki colobus monkey ( P. semlikiensis ).
Way of life
Oustalet colobus monkeys live in groups consisting of 3 to 18 animals in tropical lowland rainforests, swamps, gallery forests and forest patches in the savannah and feed on leaves, sprouts, fruits, flowers, buds and possibly also seeds. They were seen going into the water to collect tubers from aquatic plants. Reproduction has not yet been researched.
Systematics
The Oustalet colobus monkey was described as Colobus oustaleti in 1906 . Together with the Luvua colobus monkey ( P. foai ), the Semliki colobus monkey ( P. semlikiensis ) and the Thollon colobus monkey ( P. tholloni ) it forms a morphological group that is characterized by a longer palatine bone , early closing skull sutures and angular eye sockets differ from other colobus monkeys. Within the Oustalet colobus monkeys, two clades can be distinguished on the basis of mitochondrial DNA , a western one, which is more closely related to the Lomami colobus monkey ( P. parmentieri ), and an eastern one, which has more in common with the Luvua colobus monkey ( P. foai ) , the Uganda colobus monkey ( P. tephrosceles ) and the Tana colobus monkey ( P. rufomitratus ).
To the southeast of the distribution area of the Oustalet colobus monkey, in the Ituri rainforest , there is a larger region in which the population of the red colobus monkey arose from the hybridization of three species. It stretches from the Aruwimi in the north and the mountains west of the Eduardsee in the east almost to the Lualaba in the west. The three species involved are the Oustalet colobus monkey, the Lualaba colobus monkey ( P. langi ) and the Semliki colobus monkey ( P. semlikiensis ). The hybrids in most cases have bright red fore bodies, shoulders and arms. The middle back is orange-brown, the rear back, legs and tail are black. The throat, chest and stomach are gray or yellowish in color. However, there are also mostly maroon or dark red-brown specimens. The hybrids were described as a separate species under the name Piliocolobus ellioti .
Danger
The IUCN does not yet list the Oustalet colobus monkey in its Red List of Endangered Species . In its area of distribution there are various protected areas, e.g. B. the okapi game reserve .
literature
- Elizabeth L. Gadsby, Colin P. Groves, Aoife Healy, K. Praveen Karanth, Sanjay Molur, Tilo Nadler, Matthew C. Richardson, Erin P. Riley, Anthony B. Rylands, Lori K. Sheeran, Nelson Ting, Janette Wallis, Siân S. Waters & Danielle J. Whittaker: Family Cercopithecidae (Old World Monkeys). Page 710 in Russell A. Mittermeier , Anthony B. Rylands & Don E. Wilson : Handbook of the Mammals of the World: - Volume 3. Primates. Lynx Editions, 2013 ISBN 978-8496553897
- Jonathan Kingdon , David Happold, Michael Hoffmann, Thomas Butynski, Meredith Happold and Jan Kalina (Eds.): Mammals of Africa Volume II: Primates , Bloomsbury, London, 2013 ISBN 978-1-4081-2252-5