Embryonic development and resorption in feral nutria (Myocastor coypus) from Maryland

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Abstract
Between June, 1974 and March, 1976, 77 pregnant female nutria (M. coypus) were collected in Dorchester County, Maryland [USA], The embryos from 3 mm to full-term in size, were weighed, measured, dehydrated and serial paraffin sections were made. Observations were made of development and resorption. Embryo development in the nutria was similar to that of other mammals except that the normal closure of the neural tube was completed much later, the thin roof present on the metencephalon of other mammals was lacking, the olfactory nerves developed earlier than normal in 2 embryos and development of mesonephros was complete much later than normal.

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