Patterns of Embryonic Development in Early to Middle Devonian Ammonoids

  • Susan M. Klofak
  • Neil H. Landman
  • Royal H. Mapes

The basic structure of the ammonitella or embryonic shell of the Ammonoidea has been well documented (Sandberger, 1851; Branco, 1879–1880, 1880–1881; Schindewolf, 1933; Erben, 1960). The ammonitella begins with a small egg-shaped or spherical initial chamber (=protoconch) (for discussion of terms see Schindewolf, 1933; House, 1996; and Landman et al., 1996; see Landman et al., 1996 for additional references) and extends as a straight shaft or coiled tube (called the ammonitella coil by House, 1996: 168). In most species the ammonitella extends approximately one whorl ending in a primary constriction (Landman et al., 1996; Klofak et al., 1999). Internally, the siphuncle originates in the initial chamber as a rounded caecum and is attached to the shell wall by a prosiphon (Landman, 1988: Figs. 1, 2 and Klofak et al., 1999: Figs. 1, 2).


Permian Quartz Cretaceous Jurassic Perforation 


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Copyright information

© Springer 2007

Authors and Affiliations

  • Susan M. Klofak
    • 1
  • Neil H. Landman
    • 1
  • Royal H. Mapes
    • 2
  1. 1.Division of Paleontology (Invertebrates)American Museum of Natural HistoryNew YorkUSA
  2. 2.Department of Geological SciencesOhio UniversityAthensUSA

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