Titlebook: Evolutionary Biology of Primitive Fishes; R. E. Foreman,A. Gorbman,R. Olsson Book 1985 Springer Science+Business Media New York 1985 biolo

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Natural Law, Reason and Religion,ion years ago. The chondrichthyans are subdivided into elasmobranchs (sharks and rays) and holocephalans (chimaeras and ratfishes). These are probably sister groups, sharing a common ancestor from which they diverged some 350 million years ago (see Dodd, 1983 for references). As might be expected, t

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Habitat, Phylogeny and the Evolution of Osmoregulatory Strategies in Primitive Fishes,accomplished by physiologists who most fully understand the nature of their data and the source of its variability, rather than by the “professional” systematist whose bias towards a particular “system” might prevent the physiological data from acting as a truly independent test of the conventional

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Book 1985ium it was felt that the intervening years have produced numerous lines of new evidence that could be employed in the same way that a navigator determines his position. Each field, be it adult morphology, geology, ecology, biochemistry, development or physiology, generates evidence that can be extra

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ent symposium it was felt that the intervening years have produced numerous lines of new evidence that could be employed in the same way that a navigator determines his position. Each field, be it adult morphology, geology, ecology, biochemistry, development or physiology, generates evidence that can be extra978-1-4615-9455-0978-1-4615-9453-6

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Edwin N. Forman,Rosalind Ekman Ladd(Denison, 1956; Spjeldnaes, 1967; Ritchie and Gilbert-Tomlinson, 1977; Repetski, 1978; Darby, 1982). The fossil record, while incomplete, is unambiguous on this point: there are no demonstrably freshwater fossil vertebrates known until the late Silurian (Denison, 1956).