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By Ben Dawes (Eds.)

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And Delyamure, S. L. (1952). “Key to the Parasitic Nematodes. vol. iii. ” Izdatel’stvo Akademii Nauk SSSR, Moscow. ) Skrjabin, K. , Shikhobalova, N. , Sobolev, A. , Paramonov, A. A. and Sudarikov, V. E. (1954). “Descriptive Catalogue of Parasitic Nematodes. vol. iv. ” (in Russian). 927 pp. Izadtel’stvo Akademii Nauk SSSR, Moscow. Smyth, J. D. (1962). Parasitology 52, 441-57. Spasski, A. A. (1951). “Essentials of Cestodology. vol. 1. ” 783 pp. Izdatel’stvo Akademii Nauk SSSR,Moscow. ) Stunkard, H.

6. Related parasites have evolved from a common ancestor, whether in related hosts or not. HOST SPECIFICITY A N D EVOLUTION 27 7. Related parasites in unrelated host groups have developed divergent evolutionary lines and the earlier the original association, the greater the divergence and the more highly specialized the parasite. 8. Unrelated host groups which have numerous parasites related to each other, must in the early days of their evolution, have lived in common with each other. Palaeontology not only is a science dealing with morphology and classification, but its main interest lies in the fact that it is also the science dealing with the distribution of extinct animals and plants; in other words, it is partly palaeobiogeography.

Tropica in hamsters. e. L . mexicana.

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