desert grassland whiptail

Cnemidophorus uniparens

Desert grassland whiptail lizard 5

The Desert Grassland Whiptail lizard (Aspidoscelis uniparens) is an all-female species. It was formerly placed in the genus Cnemidophorus. These reptiles reproduce by parthenogenesis; eggs undergo a chromosome doubling after meiosis and develop into lizards without being fertilized. However, ovulation is enhanced by female-female courtship and "mating" (pseudocopulation) rituals that resemble the behavior of closely related to species that reproduce sexually.[1][2][3] However, this claim has been disputed, as Collins and Pinch relate.[4]

The lizard lives in dry deserts from central Arizona to west Texas and south into Mexico.


  1. ^Crews, D. & Fitzgerald, K.T. (1980). "Sexual" behavior in parthenogenetic lizards (Cnemidophorus). Proceedings of the National Academy of Sciences, 77, 1. pp. 499-502.
  2. ^Crews, D., Grassman, M. & Lindzey, J. (1986). Behavioral Facilitation of Reproduction in Sexual and Unisexual Whiptail Lizards. Proceedings of the National Academy of Sciences, 83, 24. pp. 9547-9550.
  3. ^Grassman, M. & Crews, D. (1987). Dominance and reproduction in a parthenogenetic lizard. Behavioral Ecology and Sociobiology, 21. pp. 141-147.
  4. ^Collins, H. M. & Pinch, T. J. (1993). The Golem: What You Should Know about Science. Cambridge, United Kingdom: Cambridge University Press, pp. 109-119.

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  1. (c) 2011 Vicente Mata-Silva, some rights reserved (CC BY),
  2. (c) sullivanribbit, some rights reserved (CC BY-NC), uploaded by John Sullivan,
  3. (c) John Sullivan, some rights reserved (CC BY-NC),
  4. (c) John Sullivan, some rights reserved (CC BY-NC),
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