Phylogeny of Fusus and Its Allies PDF ePub eBook

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Phylogeny of Fusus and Its Allies free pdf Excerpt from Phylogeny of Fusus and Its Allies The phylogeny of Gastropoda has received but little attention from students of Mollusca, who have either confined themselves to the study of faunas, and to specific description, or have investigated problems in connection with the ontogeny of individual members of one or more phyletic series. Besides the classical memoir of Hyatt, on the Tertiary species of Planorbis at Steinheim, only two other important works which arc devoted to a study of the serial development of phyletic groups have come to my notice. These are Koken's "Entwickelung der Gastropoden vom Cambrium bis zur Trias," and an elaborate paper by the countess Maria von Linden, in which she traces the development of several genera of recent gastropoda including Conus, Voluta and Strombus. Both authors make use of the successive types of ornamentation of the shell, and Countess von Linden uses furthermore the successive changes in the color pattern of the shell as a means of establishing phyletic relationships. The shells of Gastropoda are particularly well adapted for phylogenetic study, since all the stages from protoconch to the last stage in the development of the individual are not only retained (provided the specimen is perfect), but all of them are usually visible, so that the study of the spire furnishes us with the means of differentiating the successive stages in the development of any individual, which may then be correlated with the adult stages of more primitive types of the same phyletic series. It is a noteworthy fact that the chief changes in the gastropod shell are at the periphery and on the shoulder of the whorl, or, in other words, in those portions which are nearly always exposed even after the addition of new whorls. It is thus usually unnecessary to break down the shell, so as to get at the earlier stages, as must be done with dose-coiled cephalopod shells, when young material is not available. Thus a single perfect gastropod shell will reveal in its superficial characters nearly the whole life history of the series to which it belongs. In determining genetic boundaries, the most important shell feature is the protoconch. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully- any imperfections that remain are intentionally left to preserve the state of such historical works.

About Amadeus W Grabau

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Details Book

Author : Amadeus W Grabau
Publisher : Forgotten Books
Data Published : 27 September 2015
ISBN : 133233735X
EAN : 9781332337354
Format Book : PDF, Epub, DOCx, TXT
Number of Pages : 230 pages
Age + : 15 years
Language : English
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  • Phylogeny of Fusus and Its Allies free pdfPhylogeny of Fusus and Its Allies

    Free Ebook ePub Downloads. Excerpt from Phylogeny of Fusus and Its Allies The phylogeny of Gastropoda has received but little attention from students of Mollusca, who have either confined themselves t