Polyembryony in the Armadillo: Genetic or Physiological?

  title={Polyembryony in the Armadillo: Genetic or Physiological?},
  author={G. W. D. Hamlett},
  journal={The Quarterly Review of Biology},
  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… 

The nine-banded armadillo: a model for leprosy and other biomedical research.

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  • 1971
This animal has now proved its usefulness for this purpose since a nine-banded armadillo has developed a lepromatoid form of infection after inoculation with human leprosy bacillus inoculum.


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The occurrence of five juvenile nine-banded armadillos (Dasypus novemcinctus) is reported from a trail-camera picture taken as part of a larger study investigating the dynamics of a medium-sized mammal community in an urban area.

Monozygotic twins in cattle.

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The experiments show that under ordinary conditions the oxygen consumption of dwarf embryos should show a greater total oxygen consumption than one normal embryo when corresponding stages of development are attained, and that the latter is the case.

Localization of 3H-estradiol in the uterus of pregnant and non-pregnant armadillos

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Multiple Pregnancies

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  • Benirschke's Pathology of the Human Placenta
  • 2021



A Probable Explanation of Polyembryony in the Armadillo

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

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

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