naSpringer Science & Business Media, 08 սեպ, 2010 թ. - 392 էջ One of the major questions in the evolution of animals is the transition from unicellular to multicellular organization, which resulted in the emergence of Metazoa through a hypothetical Urmetazoa. The Comparative Embryology of Sponges contains abundant original and literary data on comparative embryology and morphology of the Porifera (Sponges), a group of 'lower Metazoa'. On the basis of this material, original typization of the development of Sponges is given and the problems concerning origin and evolution of Porifera and their ontogenesis are discussed. A morphogenetic interpretation of the body plan development during embryogenesis, metamorphosis and asexual reproduction in Sponges is proposed. Special attention is given to the analysis of characteristic features of the ontogenesis in Porifera. The book pursues three primary goals: 1) generalization of all existing information on individual development of sponges, its classification and a statement according to taxonomical structure of Porifera; 2) revealing of heterogeneity of morphogenesis and peculiarities of ontogeneses in various clades of Porifera, and also their correlations with the organization, both adult sponges, and their larvae; 3) revealing homology of morphogeneses in both Porifera and Eumetazoa, testifying to the general evolutionary roots of multicellular animals, and peculiar features of sponges' morphogeneses and ontogenesis. This book will be of interest to embryologists, zoologists, morphologists and researchers in evolutionary biology. |
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Chapter 1 | 3 |
Chapter 2 | 37 |
Chapter 3 | 47 |
Chapter 4 | 177 |
Chapter 5 | 209 |
Chapter 6 | 231 |
Chapter 7 | 269 |
Chapter 8 | 282 |
References | 287 |
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Common terms and phrases
actively adult animals apical aquiferous system archaeocytes axis bacteria basal become Bergquist Biol blastomeres blastula body Borojevic Boury-Esnault budding Calcaronea Calcinea canals cavity characteristic choanocyte chambers ciliated cells cleavage coeloblastula collagen considered consists contain Courtesy covering cycle cytoplasm demosponges Demospongiae described differentiation direct dujardini early embryo endopinacocytes epithelium Ereskovsky et al evolution external flattened formation formed freshwater function gametes granular cells granules groups Halisarca Haplosclerida Homoscleromorpha inclusions inside internal internal cells Korotkova larva larval cells later layer Lévi Leys Light Maldonado marine membrane mesohyl metamorphosis microscopic migrate morphogenesis morula nucleus numerous observed occurs oocyte oogenesis organization origin Oscarella oviparous parenchymella parent Poecilosclerida polarity Porifera posterior pole present pupa reproduced by permission Scale bars sexual sexual reproduction similar Simpson skeleton specialized species spicules sponges stage structure studied surface tissues Tuzet Vacelet Weissenfels yolk Zool