Page 154 - Introduction to Paleobiology and The Fossil Record
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(a) (b) 1 cm
Figure 6.2 Sexual dimorphism in ammonites, the Jurassic Kosmoceras. The larger shell (a) was
probably the female, the smaller (b) the male. (Courtesy of Jim Kennedy and Peter Skelton.)
(a)
(b)
Figure 6.3 Adult female Ichthyosaurus (a) from the Lower Jurassic of Somerset, England, showing an
embryo that has just been born (arrow), and detail of the curled embryo (b). (Courtesy of Makoto
Manabe.)
