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Palaeozoic Fishes PALAEOZOIC FISHES Palaeozoic Fishes PALAEOZOIC FISHES J. A. MOY-THOMAS SECOND EDITION EXTENSIVELY REVISED BY R. S. MILES CHAPMAN AND HALL LTD II NEW FETTER LANE· LONDON EC4 First published 1939 by Methuen and Co. Ltd. Second edition extensively revised by R. S. Miles 1971 published by Chapman and Hall Ltd, 11 New Fetter Lane, London ECAP 4EE Photoset in Malta by St. Paul's Press Ltd. ISBN-13: 978-1-4684-6467-2 e-ISBN-13: 978-1-4684-6465-8 DOl: 10.1007/978-1-4684-6465-8 © 1971 J. Moy-Thomas and R. S. Miles Softcover reprint ofthe hardcover 1st edition 1971 All rights reserved. No part of this publication may be produced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of the publisher. Contents Preface Introduction 1.1. Conspectus, 1; 1.2. Evolution of jaws, 2; 1.3. Fossil record, 4; 1.4. Environment,6; 1.5. Classification,7; References, 8; Bibliography, 9. 2 Class Cephalaspidomorphi 2.1. Classification, 10; 2.2. Cephalaspidomorph characteristics, 11; 2.3. Infraclass 1, Osteostraci, 12; 2.3.1. Structure, 13; 2.3.2. Growth and life history, 19; 2.3.3. Diversity and tendencies in evolution, 20; 2.4. Infraclass 2, Anaspida, 23; 2.4.1 Structure, 24; 2.4.2. Growth,26; 2.4.3. Diversity, 27; 2.5. Infraclass 3, Petromyzonida, 27; 2.5.1. Structure, 27; 2.6. Incertae sedis Palaeospondylus. 28; 2.7. Mode of life, 29; References, 31. 3 Class Pteraspidomorphi 3.1.· Classification, 35; 3.2. Pteraspidomorph characteristics, 36; 3.3. Subclass 1, Heterostraci, 36; 3.3.1. Structure, 36; 3.3.2. Growth and the evolution of the shield, 41; 3.3.3. Diversity and interrelationships, 45; 3.3.4. Mode of life, 49; 3.4. Incertae sedis Polybranchiaspis, 52; 3.5. Subclass 2, Thelodonti, 53; 3.5.1. Structure, 53; 3.5.2. Diversity and affinities, 55; 3.6. Relationships of agnathans, 56; References, 57. 4 Subclass Acanthodii 4.1. Classification, 61; 4.2. Acanthodian characteristics, 61; 4.2.1. Structure,63; 4.2.2. Diversity and tendencies in evolution, 71; v PALAEOZOIC FISHES 4.2.3. Mode of life, 75; References-, 76. 5 Subclass Osteichthyes. Infraclass Actinopterygii 5.1. Classification, 79; 5.2. Osteichthyan characteristics, 80; 5.3. Infraclass Actinopterygii, 81; 5.4. Superorder 1, Chondrostei, 86; 5.5. Order 1, Palaeoniscida, 86; 5.5.1. Structure, 87; 5.5.2. Suborder 1, Palaeoniscoidei, 91; 5.5.3. Suborder 2, Platysomidei, 94; 5.6. Order 2, Haplolepidida, 97; 5.7. Order 3, Tarrasiida, 97; 5.8. Order 4, Phanerorhynchida, 98; 5.9. Order 5, Dorypterida, 99; 5.10. Superorder 2, Holostei, 99; 5.11. Order 1, Semionotida, 100; 5.12. Tendencies in evolution, 102; References, 105. 6 Subclass Osteichthyes. Infraclass Crossopterygii 6.1. Classification, 110; 6.2. Crossopterygian characteristics, 111; 6.3. Superorder 1, Rhipidistia, 113; 6.3.1. Structure, 114; 6.3.2. Order 1, Holoptychiida, 122; 6.3.3. Order 2, Osteolepidida, 125; 6.3.4. Order 3, Rhizodontida, 126; 6.3.5. Tendencies in evolution, 127; 6.4. Superorder 2, Actinistia, 127; 6.4.1. Structure,127; 6.4.2. Diversity, 131; 6.5. Incertae sedis Onychodontidae, 131; 6.6. Mode of life, 134; References, 136. 7 Subclass Osteichthyes. Infraclass Dipnoi 7.1. Classification,141; 7.2. Dipnoan characteristics, 141; 7.3. Structure and diversity, 144; 7.3.1. Structure, 144; 7.3.2. Diversity, 149; 7.4. Evolution and mode of life, 153; 7.5. Growth of cosmoid scales and bones, 154; 7.6. Relationships ofteleostomes, 155; References, 158. 8 Subclass Placodermi 8.1. Classification, 161; 8.2. Placoderm characteristics, 162; 8.3. Order 1, Arthrodira, 163; 8.3.1. Structure, 164; 8.3.2. Diversity and tendencies in evolution, 170; 8.4. Order 2, Ptyctodontida, 178; 8.5. Order 3, Phyllolepidida, 180; 8.6. Order 4, Petalichthyida, 181; 8.7. Order 5, Rhenanida, 185; vi CONTENTS 8.7.1. Suborder 1, Palaeacanthaspidoidei, 185; 8.7.2. Suborder 2, Gemuendinoidei, 188; 8.8. Order 6, Antiarchi, 191; 8.9. Incertae sedis Stensioellidae, 195; 8.10 Evolution and mode of life, 197; References, 200. 9 Subclass Chondrichthyes. In/raclasJ Elasmobranchii 9.1. Classification,206; 9.2. Chondrichthyan characteristics, 206; 9.3. Infraclass Elasmobranchii, 209; 9.4. Order 1, Cladoselachida, 210; 9.5. Order 2, Cladodontida, 213; 9.6. Order 3, Selachii, 215; 9.6.1. Suborder 1, Ctenacanthoidei, 215; 9.6.2. Suborder 2, Hybodontoidei, 217; 9.7. Order 4, Xenacanthida, 218; 9.8. Incertae sedis Order 5, Helicopriondia, 220; 9.9. Evolution, 221; 9.10. Mode oflife, 222; References, 223. 10 Subclass Chondrichthyes. In/raclass Holocephali 10.1. Classification,226; 10.2. Holocephalan characteristics, 227; 10.3. Order 1, Chimaerida, 229; 10.3.1. Suborder 1, Helodontoidei, 229; 10.3.2. Suborder 2, Cochliodontoidei, 231; 10.3.3. Suborder 3, Menaspoidei, 231; 10.4. Order 2, Chondrenchelyida, 233; 10.5. Order 3, Edestida, 234; 10.6. Incertae sedis Ornithoprion, 237; 10.7. Order 4, Psammodontida, 238; 10.8. Order 5, Copodontida, 238; 10.9. Incertae sedis Order 6, Petalodontida, 239; 10.10 Evolution and mode oflife, 240; 10.11. Relationship of elasmobranchiomorphs, 242; References, 244. 11 Summary 0/ the early evolution 0/ fishes Index vii Preface to the Second Edition I have revised Moy-Thomas's widely used book on Palaeozoic fishes in an attempt to incorporate some of the considerable advances that have been made in this field over the last 30 years, which have in some respects made the first edition seriously out-of-date. The book is now inevitably longer, but its scope remains the same and the original approach has been main­ tained as far as possible. I have, however, undertaken a certain amount ofre­ arrangement of the contents, consonant with our changing views of fish evolution, and have tried to reflect some of the current preoccupations of students of fish evolution in expanded sections on mode of life and relation­ ships. The illustrations have been completely replaced, and in selecting the figures I have been faced with an embarrassing richness of source material. In an attempt to keep the figures down to a reasonable number, I have decided that it is better to have a few species illustrated with clear drawings than give thumb-nail sketches of all the forms mentioned in the text, and as far as possible to restrict the illustrations to Palaeozoic species. All the illustrations have been redrawn to a common style, and in some cases they have been specially prepared or modified for this book. Authors' names are now included in the text and a list of references is given at the end of each chapter. The great flood of literature in recent years has raised many prob­ lems, not least in the compilation of the lists of references. To conserve space it has been necessary to restrict these very largely to papers published in the last 20 or 30 years, but I am confident that the writings of earlier work­ ers can be reached through these papers. The small glossary of the first edition has been omitted, as I feel that its function is better fulfilled by the labelled drawings and by the Bibliography in the Introduction. Finally the classification has been divided among the individual chapters to make it more accessible for the reader. I wish here to express my gratitude to Dr. Mahala Andrews and Dr. C. Patterson who have read the manuscript, corrected mistakes and provided much good advice. I am also indebted to Dr. R. P. S. Jefferies who has critically read the first two chapters, and to Dr. B. G. Gardiner for comments on Chapter 5. The opinions expressed and any mistakes that remain are, of course, my sole responsibility. I should also like to thank these colleagues viii PREFACE TO THE SECOND EDITION and Drs. D. L. Dineley, L. B. Halstead, A. Ritchie, E. I. White, H. P. Whiting and Miss Susan Turner for the information they have provided on particular points. Drs. Andrews, Gardiner and Halstead have kindly permitted me to see work in manuscript, otherwise I have made no use in the text of works that reached me after June, 1970. Dr. B. G. Gardiner has kindly assisted me by reading the proofs. R.S.M. July, 1970 ix Preface to the First Edition During the past twenty years no branch of Palaeontology has advanced more rapidly than that of the fishes. Modern methods of examining fossils with low-powered binoculars under various liquids, the introduction of powerful lamps, the use of acids and fine mechanical hammers, and the method of restoring fossils from serial sections have all contributed to this. Not only have the methods of studying fossils improved and made it possible to give far more accurate descriptions than has been done hitherto, but this rapidly advancing field has attracted a greater number of workers. In this respect our knowledge of the Palaeozoic fishes has particularly benefited. The tremendous influx of literature due to this stimulus to research has caused text-books to be out-of-date almost as soon as they are published, and although it is highly probable that this book will in many respects be shortly out-of-date, it is intended to be an attempt to bring the latest re­ search on the early history of fishes to the student of both zoology and geology. The more accurate knowledge of early fishes increases, the more clear it is becoming that they are not only interesting as an evolutionary study, but are also important to the geologist for stratigraphical purposes.
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