The New World monkeys are all arboreal, whereas Old World monkeys include arboreal and ground-dwelling species. Due to this reproductive isolation, New World monkeys and Old World monkeys underwent separate adaptive radiations over millions of years. Plesiadapiforms had some features of the teeth and skeleton in common with true primates. Prosimians include the bush babies and pottos of Africa, the lemurs of Madagascar, and the lorises of Southeast Asia. AMIR MUMIN 2. Primates are an incredibly diverse genera, ranging from humans to lemurs. 0000088712 00000 n Primates and Evolution Essay 675 Words | 3 Pages. Primates also characteristics of primates. At the time the platyrrhines arose, the continents of South American and Africa had drifted apart. Anthropoids include monkeys, apes, and humans. Apes evolved from the catarrhines in Africa midway through the Cenozoic during the Miocene epoch, approximately 25 million years ago. Tarsier, also from Southeast Asia, show some prosimian-like and some anthropoid-like features. %PDF-1.4 105 0 obj << /Linearized 1 /O 107 /H [ 940 274] /L 977902 /E 107561 /N 8 /T 975679 >> endobj xref 105 24 0000000016 00000 n Have questions or comments? 01. of 08. Anthropoids ancestral to apes appear in the Miocene epoch around 25 million years ago. Additional characteristics (not necessarily unique to primates) include first toe with a nail, while other digits bear either nails or claws, and stomach simple in most forms (sacculated in some leaf-eating cercopithecids). 0000088908 00000 n •Erect posture. 0000001673 00000 n Unless otherwise noted, LibreTexts content is licensed by CC BY-NC-SA 3.0. Primate eyes face forward so that they see an object simultane-ously from two viewpoints. Characteristics of Primates Senses • Most primates are diurnal, or active during the day • Diurnal primates have color vision, reduced sense of smell • Some primates are nocturnal, or active at night • Black and white vision • Most primates have unspecialized teeth, suitable for a diverse diet. The very arboreal gibbons are smaller than the great apes; they have low sexual dimorphism (that is, the genders are not markedly different in size); and they have relatively longer arms used for swinging/brachiating through trees. 2. There are eight main mammal characteristics, ranging from having hair to four-chambered hearts, that set mammals apart from all other vertebrates. 0000086721 00000 n Shoulders and Hips. The great apes include the genera Pan (chimpanzees and bonobos), Gorilla (gorillas), Pongo (orangutans), and Homo (humans). Primates have a highly developed sense of vision, called binocular vision. 0000078746 00000 n Hair and Fur . Some Common Characteristics of Primates: Dexterous hands ; A generalized skeleton for great physical agility; Large brain size; keen vision. All mammals have hair growing from some parts of their bodies during at least some stage of their life cycle. 0000087963 00000 n Fossils of this primate have been dated to approximately 55 million years ago. General Characteristics of primates; Other characteristics of Primates; Classification of Primates; Evolution of Class Primata: Based on the paleontological evidence found in North America and Europe, the primates may have evolved 55 – 60 million years ago in these continents. •Emphasis on vision. True primates, ancestral to prosimians, first appear in the fossil record in the Eocene epoch around 55 million years ago; they were similar in form to lemurs. New World monkeys are also called Platyrrhini: a reference to their broad noses. A primate is defined by its many incredible features. 0000085899 00000 n •binocular or stereoscopic vision. Therefore, it is thought that monkeys arose in the Old World and reached the New World by drifting on log rafts or mangrove floating ‘islands’. •postorbital bar or post orbital closure. There is still quite a bit of uncertainty about the origins of the New World monkeys. They were found in North America and Europe in the Cenozoic, going extinct by the end of the Eocene. As you might imagine, this type of vision is helpful for an animal jump-ing from tree to tree.

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