By Alan Dale (Auth.)
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Additional resources for An Introduction to Social Biology
Tornaria larva of Balanoglossus, a the world than they are primitive vertebrate. This should be compared with the Echinoderm larva shown in now. The history of the Fig. 23, a. ) reptile group, as traced by fossil remains, shows the group to have emerged gradually from the Amphibians in the late Carboniferous (perhaps 250 million years ago), and then, when firmly established in the Permian, to have undergone a kind of evolutionary outburst in the Triassic, producing several unique types. Many of FIG.
Now they are restricted to the Australian region, with the exception of the North FIG. 14. LEPIDOSIREN * PROTOPTERUS B = CEDAR OF LEBANON = ATLAS CEDAR NEOCERATODUS C = DEODAR (HIMALAYAN CEDAR) Map to show the present day distribution of Cedars and Lung-fishes. American opossums and two species of a peculiar South American marsupial called Cœnolestes. In Australia, which, unlike other continents, has no true placental mammals that have not been introduced by man, marsupials have become specialised to fill all the diverse types of habitats occupied in other regions by placental mammals.
In the meanwhile, attention during the past few years has become focussed upon a possible mechanism whereby man may have been evolved from the ape-like stock in the first instance. It has long been appreciated that many human characteristics such as the relatively large brain, the absence of eyebrow ridges, and hairlessness, are characters possessed by very young (fœtal) stages of such apes as the gorilla. Now, it is known that certain animals are juvenile forms which have become sexually mature without developing the changes in bodily structure that accompany sexual maturity in normal members MAN AND EVOLUTION 45 of the species or of related species.