On the Law of Irreversible Evolution

Cover On the Law of Irreversible Evolution
On the Law of Irreversible Evolution
Branislav Petronieics
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C. , pp. . 89-97) that the diphy cereal tail of the Dipnoi (and of the other known ancient and modern fishes) is a secondary diphy cereal tail whose morphological value in the Dipnoi (the second dorsal fin, the second anal fin) is not equivalent to the morphological value of the primitive diphycercal tail (caudal fin). In this secondary diplry- cercal condition there is therefore no return to the primitive structure.
The most important other cases of phylogeny which Dollo has considered are the
... phylogeny of the sirenians (Dollo 3, p. 119), the phylogeny of the Leather-backed turtle (Dollo, 7, p. 9), and the phylogeny of the Holocephali (Dollo, 13, p. 107).
One of the most important cases with regard to the ethological application of the law of irreversibility is found in the memoir on the Dipnoi. If it be assumed that Dipterus comes from Ceratodus, as the latter is an adaptation to life in turbid water, it would be necessary to suppose either that Dipterus represents an adaptation to life in mud (excessively turbid water), or else that it represents a return to life in clear water.


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