![]() ![]() The existing fossil evidence (mostly from North Africa) is very fragmented. They were roughly similar to squirrels and tree shrews in size and appearance. The first primate-like mammals are referred to as proto-primates. In general, prosimians tend to be nocturnal (in contrast to diurnal anthropoids) and exhibit a smaller size and smaller brain than anthropoids. ![]() Anthropoids include monkeys, apes, and humans. Prosimians include the bush babies of Africa, the lemurs of Madagascar, and the lorises, pottos, and tarsiers of Southeast Asia. Order Primates is divided into two groups: prosimians and anthropoids. Other characteristics of primates are brains that are larger than those of most other mammals, claws that have been modified into flattened nails, typically only one offspring per pregnancy, and a trend toward holding the body upright. These adaptations include, but are not limited to: 1) a rotating shoulder joint, 2) a big toe that is widely separated from the other toes and thumbs, which are widely separated from fingers (except humans), which allow for gripping branches, 3) stereoscopic vision, two overlapping fields of vision from the eyes, which allows for the perception of depth and gauging distance. This arboreal heritage of primates has resulted in hands and feet that are adapted for brachiation, or climbing and swinging through trees. ![]() * Characteristics of PrimatesĪll primate species possess adaptations for climbing trees, as they all descended from tree-dwellers. The characteristics and evolution of primates is of particular interest to us as it allows us to understand the evolution of our own species. They range in size from the mouse lemur at 30 grams (1 ounce) to the mountain gorilla at 200 kilograms (441 pounds). Non-human primates live primarily in the tropical or subtropical regions of South America, Africa, and Asia. Order Primates of class Mammalia includes lemurs, tarsiers, monkeys, apes, and humans. ![]()
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