By Richard Bohart & Lionel Stange
Read or Download A revision of the genus Zethus Fabricius in the Western Hemisphere (Hymenoptera: Eumenidae) PDF
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Extra info for A revision of the genus Zethus Fabricius in the Western Hemisphere (Hymenoptera: Eumenidae)
Acanthostega (Fig. 12, 2), perhaps the most fish-like of all known tetrapods, still had fin rays in its caudal fin. It was partly covered with scales, and had a functional gill apparatus. Its paired appendages had eight digits. Ichthyostega (Fig. 12, 1) was more massively built and perhaps more advanced in having only six or seven digits. It is probable that these early tetrapods could not walk properly on land, as their limbs looked more like flippers than like true legs. At the most they could crawl on a beach like seals, but they certainly fed in the water, on fish trapped in pools by low tide.
Locality names or geographical distributions of taxa are mentioned only where relevant (endemic taxa, biogeographical comparisons). Citation of authors in the text is kept to the minimum in order to make the book easier to read. Classical works, monographs, and general or controversial papers on the subject are cited as 'further reading' at the end of each section or chapter. The stratigraphical scale and ages used in this book are taken from Harland et al. (1990). The appendix provides references and short comments on important papers that have appeared while the book was in the press.
J36 1996 567-dc20 95-26847 ISBN 0 19 854047 7 Printed in Great Britain by The Bath Press, Bath Page v Preface 'Early vertebrates', the title of this book, admittedly sounds vague and uninformative by comparison with 'Palaeozoic fishes', the title of a now-famous book by J. A. Moy-Thomas (1939, revised by R. S. Miles 1971), but I deliberately chose these words to avoid linking groups of animals with particular geological periods, even though most of the species dealt with here are in fact 'fishes' and are of Palaeozoic age.