The University Museum
The University of Tokyo


Bulletin No.24


NATURAL HISTORY AND EVOLUTION OF
CRYPTOPECTEN (A CENOZOIC-
RECENT PECTINID GENUS)


Itaru HAYAMI


1984 TOKYO




CONTENTS

Chapter 1 Introduction
Chapter 2 Material and Method of Study
Chapter 3 Geographic Distribution and Habitat of Living Cryptopecten
Chapter 4 Stratigraphic Distribution and Mode of Occurrence of Fossil Cryptopecten
Chapter 5 Ontogenetical Development of Surface Sculpture in Cryptopecten
Chapter 6 Reproductive Season and Growth Rings of Cryptopecten
Chapter 7 Intrapopulational Variation and Relative Growth
A. Continuous Variation
 1) Shell Size and Growth Rate
 2) Length versus Height
 3) Length versus Thickness
 4) Length versus Thickness of Conjoined Valves
 5) Length versus Dorsal Length of Wings
 6) Number of Radial Ribs
B. Discontinuous Variation
 1) Color Polymorphism
 2) Dimorphism of Surface Sculpture in C. vesiculosus
C. Evaluation of Ecophenotypic Effect
Chapter 8 Geographic Variation of Cryptopecten vesiculosus
1) Shell Size and Growth Rate
2) Shape of Shell (Bivariate morphometric characters)
3) Number of Radial Ribs
4) Coloration of Shell
5) Surface Sculpture (Phenotypic frequency)
6) Causal Evaluation of Geographic Variation
Chapter 9 Phyletic Evolution of Cryptopecten vesiculosus
1) Shell Size and Growth Rate
2) Shape of Shell
3) Number of Radial Ribs
4) Surface Sculpture (Phenotypic Frequency)
Chapter 10 Inferred Speciation of Cryptopecten
Chapter 11 Discussions on Some General Problems Regarding Patterns of Morphological Change
Chapter 12 Systematic Description of Cryptopecten
Genus Cryptopecten Dall, Bartsch and Render, 1938
Cryptopecten bullatus (Dautzenberg and Bavay)
Cryptopecten nux (Reeve)
Cryptopecten nux nux (Reeve)
Cryptopecten nux sematensis (Oyama)
Cryptopecten vesiculosus (Dunker)
Cryptopecten vesiculosus vesiculosus (Dunker)
Cryptopecten vesiculosus makiyamai subsp. nov.
Cryptopecten bullatus (Dautzenberg and Bavay)
Cryptopecten phrygium (Dall)
Cryptopecten spinosus sp. nov.
Cryptopecten yanagawaensis (Nomura and Zinbo)
Chapter 13 Summary and Conclusions
1) Systematics and Distribution
2) Reproduction and Growth Rings
3) Continuous Variation and Relative Growth
4) Sculpture Dimorphism
5) Geographic Variation
6) Phyletic Evolution
7) Speciation and Extinction
8) Significance of Phenotypic Substitution in Macroevolution
9) Further Problems
List of Examined Samples
Acknowledgments
References
Postscript



Itaru HAYAMI
Department of Historical Geology and Palaeontology, The University Museum, The University of Tokyo



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