Polyembryony in the Armadillo: Genetic or Physiological?

@article{Hamlett1933PolyembryonyIT,
  title={Polyembryony in the Armadillo: Genetic or Physiological?},
  author={G. W. D. Hamlett},
  journal={The Quarterly Review of Biology},
  year={1933},
  volume={8},
  pages={348 - 358}
}
  • G. W. Hamlett
  • Published 1 September 1933
  • Biology
  • The Quarterly Review of Biology
THE PROBLEM T IHE nine-banded armadillo, Dasypus (Tatusia) novemcinctus, is of special interest to biologists, since it and the closely related D. hybridus are the only vertebrates which are known to exhibit specific polyembryony; i.e., in which the fertilized ovum regularly gives rise to more than a single embryo. Von Jhering pointed out, in i885, that the females of hybridus gave birth to several young of the same sex, and surmised that they came from a single egg. In I909 this supposition… 

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References

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A Probable Explanation of Polyembryony in the Armadillo

TLDR
Two facts are important: First, accessory embryo formations result from arrests in the developmental process; and second, the arrest must occur before gastrulation has taken place.

Heredity of twin births

TLDR
The statement that the mother alone determines the tendency to twins is not supported by the facts, and it is commonly believed that this tendency toward the production of twins must be wholly a maternal quality, depending upon the inherited tendency to double ovulation.

I92.3. The Physiology of Twinning

    Delayed implantation in the mammals, and its supposed relationship to polyembryony

    • Abstract. Anat. Rec