Final answer:
The group with very large brains, no tail, flat faces and arms designed for suspensory locomotion are the great apes, which include humans, chimpanzees, orangutans, and gorillas.
Step-by-step explanation:
The group described as having very large brains, no tail, flat faces and arms and shoulder girdles designed for suspensory locomotion are known as the great apes. This group includes humans, chimpanzees, orangutans, and gorillas. They are part of the family Hominidae. These apes have evolved to move by brachiation, a form of arboreal locomotion where they swing from tree limb to tree limb using their arms. This has led to anatomical adaptations such as long arm lengths and mobile shoulder joints, enabling them to effectively maneuver through their arboreal habitats. On the other hand, their flat faces and large brains are characteristics associated with complex social behaviors and advanced cognitive functions.