Page 349 - Introduction to Paleobiology and The Fossil Record
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336  INTRODUCTION TO PALEOBIOLOGY AND THE FOSSIL RECORD










                                              protobranch      filibranch     eulamellibranch    septibranch
                                              (a)









                                         taxodont
                                                              dysodont
                                                                                     isodont









                                                                                       desmodont
                                                                  heterodont
                                          schizodont
                                  (b)
                      Figure 13.6  (a) Main gill types in the bivalves. (b) Main types of bivalve dentition.


















                      (a)                  (b)                   (c)                      (d)














                      (e)                             (f)                             (g)
                      Figure 13.7  Some bivalve genera: (a) Glycimeras (Miocene), (b) Trigonia (Jurassic), (c) Gryphaea
                      (Jurassic), (d) Chlamys (Jurassic), (e) Mya (Recent), (f) Pholas (Recent), and (g) Spondylus (Cretaceous).
                      Magnifi cation ×0.75 for all.
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