Information about Quadrumana

Quadrumana and Bimana form an obsolete division of the primates: the Quadrumana are primates with four hands (two attached to the arms and two attached to the legs), and the Bimana being those with two hands and two feet. The attempted division of "Quadrumana" from "Bimana" form a stage in the long campaign to find a secure way of distinguishing Homo sapiens from the rest of the great apes, a distinction that was culturally essential.

Quadrumana is Latin for "four-handed ones", which is a term used for apes since they don't have feet, what are attached to the legs are really hands, as they look and operate exactly like hands, since not only with the hands attached to the arms can they do certain movements, but the ones attached to the legs can do exactly the same things and more that the hands attached to the arms cannot. All four hands can hold, grasp, point individual fingers and thumb, climb, be used as weapons, use weapons, curl into a fist, punch, slap, and more. In addition, the middle finger is the longest finger on all four hands, and each finger and thumb is the same size as seen on every other hand. What the hands attached to the legs can do which the hands attached to the arms cannot do is walking on when the ape walks on two hands without using its arms.

Bimana is Latin for "two-handed ones", which is a term used for humans, as humans have only two hands, but have two feet which apes do not.

The division was proposed by Johann Friedrich Blumenbach in the first edition of his Manual of Natural History (1779) and taken up by other naturalists, most notably Georges Cuvier. Some elevated the distinction to the level of order.

However, the many affinities between humans and other primates — and especially the great apes — made it clear that the distinction made no scientific sense. Charles Darwin wrote, in The Descent of Man (1871):

The greater number of naturalists who have taken into consideration the whole structure of man, including his mental faculties, have followed Blumenbach and Cuvier, and have placed man in a separate Order, under the title of the Bimana, and therefore on an equality with the orders of the Quadrumana, Carnivora, etc. Recently many of our best naturalists have recurred to the view first propounded by Linnaeus, so remarkable for his sagacity, and have placed man in the same Order with the Quadrumana, under the title of the Primates. The justice of this conclusion will be admitted: for in the first place, we must bear in mind the comparative insignificance for classification of the great development of the brain in man, and that the strongly-marked differences between the skulls of man and the Quadrumana (lately insisted upon by Bischoff, Aeby, and others) apparently follow from their differently developed brains. In the second place, we must remember that nearly all the other and more important differences between man and the Quadrumana are manifestly adaptive in their nature, and relate chiefly to the erect position of man; such as the structure of his hand, foot, and pelvis, the curvature of his spine, and the position of his head.

External links

• http://aleph0.clarku.edu/huxley/comm/Books/Timbs.html Excerpts from the Royal Society Yearbook, 1861, give the context of urgent discussions of features distinguishing humans from "Quadrumana", in the wake of Darwin's Origin of the Species
• Carter Blake, in Edinburgh Review (April 1863): Use of "Quadrumana" in an essay beginning "The disputes with regard to the precise affinity and relations of man to the lower animals have now excited so much acrimony, and have assumed such proportions, that we feel at length compelled to offer an opinion upon this controversy."