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Les achats comprennent une adhésion à l'essai gratuite au club de livres de l'éditeur, dans lequel vous pouvez choisir parmi plus d'un million d'ouvrages, sans frais. Le livre consiste d'articles Wikipedia sur : Echinodermata, Gastropoda, Platyhelminthes, Cnidaria, Brachiopoda, Cephalopoda, Arthropoda, Annelida, Porifera, Ectoprocta, Nematoda, Chordata, Bivalvia, Mollusca, Rotifera, Hemichordata, Acoela, Nemertea, Ctenophora, Myxozoa, Tardigrada. Non illustré. Mises à jour gratuites en ligne. Extrait : Cette page a pour objet de présenter un arbre phylogénétique des Echinodermata (Échinodermes), c'est-à-dire un cladogramme mettant en lumière les relations de parenté existant entre leurs différents groupes (ou taxa). Les points qui font l'objet de débats au sein de la communauté scientifique sont brièvement présentés avant la bibliographie. À la suite d'un taxon, sa période d'apparition, quand elle est connue, peut être indiquée suivant la légende suivante : (Plé) : Pléistocène ; (Pli) : Pliocène ; (Mio) : Miocène ; (Oli) : Oligocène ; (Éoc) : Éocène ; (Pal) : Paléocène ; (Cré) : Crétacé ; (Jur) : Jurassique ; (Tri) : Trias ; (Per) : Permien ; (Car) : Carbonifère ; (Dév) : Dévonien ; (Sil) : Silurien ; (Ord) : Ordovicien ; (Camb) : Cambrien. De plus, pour plus de précisions si possible, (-) : inférieur ; (~) : moyen ; (+) : supérieur. Le symbole ▲ renvoie à la partie immédiatement supérieure de l'arbre phylogénétique du vivant. Le signe ► renvoie à la classification phylogénétique du groupe considéré. ▲└─o Echinodermata ├─o Stylophora (éteint) │ ├─o Mitrata (éteint) │ └─o Cornuta (éteint) └─o ├─o Soluta ou Homoiostelea (éteint) └─o ├─o Cincta ou Homostelea (éteint) └─o ├─o Ctenocystoidea (éteint) └─o ├─o Helicoplacoidea (éteint) └─o ├─o Cyclocystoidea (éteint) └─o ├─? Lepidocystoidea (éteint) ├─o Blastozoa ou Eocrinoidea (paraphylétique) (éteint) │ └─o │ ├─o │ │ ├─? Parablastoidea (éteint) │ │ └─o Blastoidea (éteint) │ └─o Cyst...http://booksllc.net/?l=fr ... Read more

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This is a reproduction of a book published before 1923.This book may have occasional imperfections such as missing or blurred pages, poor pictures, errant marks, etc. that were either part of the original artifact, or were introduced by the scanning process.We believe this work is culturally important, and despite the imperfections, have elected to bring it back into print as part of our continuing commitment to the preservation of printed works worldwide.We appreciate your understanding of the imperfections in the preservation process, and hope you enjoy this valuable book. ... Read more

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Characters and classification; antedon; asterias; brittle stars; sea urchins;hemichordata. ... Read more

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Invertebrates: From Protozoa to Echinodermata provides an in depth coverage all major topics related with various invertebrates groups starting from Protozoa to Echinodermata, emphasizing their structure, function and adaptations. The book deals with important features like osmoregulation, nutrition, locomotion, reproduction of protozoa including disease producing protozoa, the amazing phenomenon of polymorphism and alternation of generation in coelenterates, the wonderful world of corals including their power of defense. The parasitic helminthes, their adaptations to the parasitic mode of life and the plant parasitic nematodes have also been discussed. Minor phyla also find elaborate description. Different aspects of arthropods like parasitism and larval forms in crustaceans, biology of Sacculina, respiration, mouthparts and metamorphic events in insects, including useful insects have also been illustrated. Groups like priapulida, bryozoa and chaetognatha find special mention. The text also includes different aspects of mollusks like torsion, adaptive radiation, foot and shell along with brain and sense organs in cephalopods and symmetry, coelom and larval forms in echinoderms. Finally, an outline classification of all major invertebrate phyla has been given. It is an authoritative source for advance undergraduate and postgraduate study as well as for competitive examinations. ... Read more

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This digital document is a journal article from Palaeogeography, Palaeoclimatology, Palaeoecology, published by Elsevier in 2006. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

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A worldwide stratigraphical survey of Late Palaeozoic and Early Mesozoic ophiuroids (Echinodermata) reveals unique extinction and recovery patterns during and after the end-Permian mass extinction event. The Ophiuroidea suffered the loss of all Palaeozoic genera. However, this clade profited greatly from the event by undergoing a significant increase in species number in the postextinction oceans. Although both sampling and taphonomic biases may have affected ophiuroid diversity changeover patterns across the Permian/Triassic (P/Tr) transition to some extent, both biases cannot explain adequately the abrupt increase in species numbers and geographically wide distributions of ophiuroids in the Early Triassic oceans. The Ophiuroidea recovery follows Erwin's model of ''a logistic increase in diversity beginning immediately after the end of the mass extinction'' without the survival interval. Morphological innovation (i.e., emergence of advanced canal systems), diversification of life habitats and biogeographical dispersal over the Palaeotethyan and Gondwanan regions enabled the Ophiuroidea to occupy efficiently vacant ecospace created by the end-Permian extinction, enabling the clade to recover and radiate in the Early Triassic oceans. Previously reported ophiuroids from the Upper Permian to Lower Triassic of China are also taxonomically revised. These, Ophiaulaxoides bijieensis (Feng), Huangzhishania gulinensis (Feng), ''Ophiolepis''? shanxiensis Yang and ''Ophioderma''? schistovertebrata Yang, were described from the Lower Triassic; while Aganaster? qingchangensis (Feng) and Syntomospina? kaiyangensis Feng came from the Upper Permian. . ... Read more

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Publisher: Sydney : Printed by John Spence, acting government printerPublication date: 1922Subjects: OphiuroideaNotes: This is an OCR reprint. There may be numerous typos or missing text. There are no illustrations or indexes.When you buy the General Books edition of this book you get free trial access to Million-Books.com where you can select from more than a million books for free. You can also preview the book there. ... Read more