A series of stages in the embryonic development of Chelydra serpentina

  title={A series of stages in the embryonic development of Chelydra serpentina},
  author={Chester L. Yntema},
  journal={Journal of Morphology},
  • C. L. Yntema
  • Published 1 June 1968
  • Biology, Medicine
  • Journal of Morphology
Eggs of the common snapping turtle, Chelydra serpentina serpentina were incubated at 30°C and at 20°C. The incubation period at the higher temperature was about 63 days. At the lower temperature, the period was estimated to be 140 days. Lengths of the embryos at various times of development were recorded. A series of 26 stages is described. The staging is based on timed intervals at a constant temperature, 20°C. 
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  • J. Decker
  • Environmental Science, Biology
  • 1967
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Procurement and use of turtle embryos for experimental procedures
Methods of obtaining the gravid females, their handling, and preoperative preparation of the egg are described, and the actual operation can be carried out much as it is done on the chick embryo.