Monday, May 15, 2006


Monkeys are arranged into two main groups. New world monkeys are known as platyrrhines which are related to apes and humans. They are only found in South America. The new world monkey nostrils are wide septum and nostrils faced outwards, but old world monkeys have narrow septum and their nostrils face forward. New world monkey are small to medium. The new world monkeys have 3 premolars while the old world monkey has 2 molars. Old word monkeys are known as catarrhines. They are only found throughout tropical Africa and Asia. All new world monkeys differ slightly from old new world monkeys in many aspects but the most prominent is nose.

Platyrrhines and catarrhine differ in shape of the nose. New world monkeys have flat nose. The nostrils are far apart and open to the side while in the old world monkey, nostrils are closer together and open downward or forward and had also dawn facing nose. The world monkey has big, sharp canines with a distena (gap between canines and incisors) and the upper canines are kept sharp by being honed. Old world monkeys have larger average than new world monkey. For examples males baboons are the biggest old world monkey. Catarrhines are more terrestrial and they share their habitats with prosiams and apes.

According to the hands of new world monkey, thumb lies in line with other digits. Spider monkey has lost their thumbs. Some species have fingernails on big toe. Where as in the old world monkey, thumbs are rotated and more opposable like human langurs, and baboons. The finger nails and toenails are present on all digits. In the new world monkey, they have 3 premolars rather than two premolars. Molars are relatively large in the new world monkeys and the last molars are relative small and sometimes absent. In the old world monkey they have two premolars. Premolars in the mandible are sectorial. That is, it is specialised for sharpening the upper canine. Molars have sharply connected cups

The ear regions of new world monkey, tympanic membrane are connected to external ear by a bony ring while in the old world monkeys, tympanic membrane are connected to external near by a bony tube. In the new world monkey some species have pensile tails while in the old world monkey all have tails but lack of prehensility feature. Few species in the new world monkey have one male multifemale group like many of the old world monkey species. New world monkey have scent glands rely more on scent to mark territories than old world monkey.

New world monkey confined to arboreal habitats and rely heavily on fruit and less on foliage with compare to old world monkeys. Old world monkeys spend some or most of the day on the ground and they tolerate in a wider range of habitats from rainforest through savannah fringe. Most of the new world monkeys are closely related. Cebidae and Atelidae families are found under new world monkey. Cidibae include animas like, squirrel, capuchin, owl and monkeys. Atelidae include animals like spider and howler monkeys.


Wikipedia Contributor Monkeys (internet) Wikipedia, the free Encyclopedia, 2006 May 12, 17:33 UTC [Cited 2006, May 12, 17:25] Available from:

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