It is a single layer of cube-shaped cells. New epidermal skin cells, called keratinocytes, are formed in this layer through cell division to replace those shed continuously from the upper layers of the epidermis. This regenerative process is called skin cell renewal. As we age, the rate of cell renewal decreases.
Primates - marmosets, monkeys, apes, lemurs, humans. There are about 233 species in this order. Primates range in size from the tiny pygmy marmoset that weighs less than 3 ounces to the large mountain gorilla that weighs close to 400 pounds.Most species of primates are found in subtropical or tropical forests and many species live in trees. Primates have five fingers on their hand and five toes on their feet.
ANTHROPOID PRIMATES. The earliest group of anthropoid primates are the Oligopithecines known from the Late Eocene which include Oligopithecus savagei, Catopithecus browni, and Proteopithecus sylviae.Fossils of teeth are similar to those primates which feed on insects and fruit.n Catopithecus, there was sexual dimorphism in the canine structure, a trait which is unknown in prosimians. Unlike most other Eocene primates, the roots of the central upper incisors fit closely like those of the anthropoids. In Catopithecus, there is the first appearance of anthropoid-like suture in the lower jaw.