Author: Theodor Mortensen
Publisher:
ISBN:
Category : Echinodermata
Languages : en
Pages : 340

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Author: Theodor Mortensen
Publisher:
ISBN:
Category :
Languages : en
Pages : 261

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Author: Theodore Mortensen
Publisher: Legare Street Press
ISBN: 9781017207415
Category : History
Languages : en
Pages : 0

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This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

Author: Thomas Mortensen
Publisher: Palala Press
ISBN: 9781341863745
Category :
Languages : en
Pages : 336

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Book Description
This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

Author: Theodore 1868-1952 Mortensen
Publisher: Wentworth Press
ISBN: 9781363665891
Category : History
Languages : en
Pages : 354

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Book Description
This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

Author: Th 1868-1952 Mortensen
Publisher: Sagwan Press
ISBN: 9781376665291
Category :
Languages : en
Pages : 340

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Book Description
This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

Author: Th Mortensen
Publisher:
ISBN: 9781331926467
Category : Science
Languages : en
Pages : 288

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Excerpt from Studies of the Development and Larval Forms of Echinoderms Ever since Joh. Muller about seventy years ago published his celebrated studies on the Echinoderm larvae, showing such unexpected richness of forms to exist among them and making known in the main features their wonderful metamorphosis, those larvae have been among the favourite objects of zoological research. The study of the larval forms themselves, the differentiation of the original simple larval type into the many highly specialized or even quite extreme forms (e.g. Auricularia nudibranchiata or Echinopluteus transversus), tracing the morphological transformation of the different parts of the larval body (so masterly done already by Joh. Muller) or of the supporting skeleton makes in itself quite a fascinating subject. The metamorphosis of the bilateral, free-swimming larva into the radial, more or less sedentary, adult - a metamorphosis no less striking than that of a caterpillar into a butterfly (indeed, the Kchinoderm metamorphosis has been characterized as the most remarkable ontogenetic change in the animal kingdom) - presents a number of interesting problems. Then the Echinoderm larvae have proved to be exceptionally good objects for experimental embryological studies, for experimental hybridization and for heredity studies. No wonder that an extensive litterature has arisen on forms presenting so many points of interest. The significance of the pelagic larvae for the study of geographical distribution was pointed out in the author's work ..Die Echinodermenlarven der Plankton-Expedition" (1898. p. 108), and this was in the author's mind when, speaking of the relation between the East African and the West Indian Echinoid fauna), the desirability of studying the development of the forms common to both regions, as, upon the whole, that of tropical Echinoderms in general, was emphasized, this being almost a terra incognita, an ample field of most promising research." 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."

Author: Herbert Clifton Chadwick
Publisher:
ISBN:
Category : Echinodermata
Languages : en
Pages : 64

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Author: D. Williamson
Publisher: Springer Science & Business Media
ISBN: 9401580774
Category : Science
Languages : en
Pages : 235

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Many biological facts are irreconcilable with the assumption that larvae and adults evolved from the same genetic stock. The author of this book draws attention to these, and presents his alternative hypothesis that larvae have been transferred from one taxon to another. In his previous book (Larvae and Evolution, 1992), the author used larval transfer to explain developmental anomalies in eight animal phyla. In the present book, he claims that the basic forms of all larvae and all embryos have been transferred from foreign taxa. This leads to a new, comprehensive theory on the origin of embryos and larvae, replacing the discredited 'recapitulation' theory of Haeckel (1866). Metamorphosis, previously unexplained, represents a change in taxon during development.

Author: Brian K. Hall
Publisher: Gulf Professional Publishing
ISBN: 9780127309354
Category : Nature
Languages : en
Pages : 466

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Book Description
A classic problem in evolutionary biology is the origin of larvae - how and why did they occur? Indeed, it has often been suggested that many entirely unique body plans first originated as retained larvae of ancestral organisms. But what of the larvae themselves? What developmental and evolutionary forces shape and constrain them? These questions and others are dealt with by this international team of leading zoologists and developmental biologists. Intended to contribute to a continuing dialectic, this book presents diverse opinions as well as manifold conclusions. Certain to challenge and intrique, The Origin and Evolution of Larval Forms should be a part of the library of every evolutionary and developmental biologist interested in larvae and their significance.