Results 81 to 90 of about 225 (136)

REPTILIAN VIVIPARITY AND DOLLO'S LAW [PDF]

Evolution; International Journal of Organic Evolution, 1998
It has been suggested repeatedly that the evolutionary transition from oviparity (egg-laying) to viviparity (live-bearing) in reptiles is irreversible. However, these adaptive arguments have yet to be tested by detailed examination of the phylogenetic distribution of oviparity and viviparity across a broad range of taxa.
, Michael Lee
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Evolution of lizard viviparity

Nature Ecology & Evolution, 2021
Analysis of oviparous and viviparous individuals of the common lizard reveals the genetic architecture of pregnancy.
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The Evolution of Viviparity in Vertebrates

2021
In the vertebrate tree of life, viviparity or live birth has independently evolved many times, resulting in a rich diversity of reproductive strategies. Viviparity is believed to be a mode of reproduction that evolved from the ancestral condition of oviparity or egg laying, where most of the fetal development occurs outside the body.
Wesley C, Warren, Frank, Grutzner
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Elevation, oxygen, and the origins of viviparity

Journal of Experimental Zoology Part B: Molecular and Developmental Evolution, 2021
Abstract Research focused on understanding the evolutionary factors that shape parity mode evolution among vertebrates have long focused on squamate reptiles (snakes and lizards), which contain all but one of the evolutionary transitions from oviparity to viviparity among extant amniotes. While most hypotheses have focused on the role
Charles M. Watson, Christian L. Cox
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Oviparity or viviparity? That is the question…

Reproductive Biology, 2012
The modes of reproduction undoubtedly represent one of the most critical life-history traits because they profoundly affect fitness and survival. The parent-offspring conflict over the degree of parental investment may be the main selective factor in the evolution of reproduction.
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Parasitism in viviparous vertebrates: an overview

Parasitology Research, 2023
The reproductive mode of viviparity has independently evolved in various animal taxa. It refers to the condition in which the embryos or young develop inside the female's body during gestation, providing advantages such as protection, nutrition, and improved survival chances.
Juan J. Palacios-Marquez, Palestina Guevara-Fiore   +1 more
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Oogenesis in a placental viviparous onychophoran

Tissue and Cell, 1994
This first ultrastructural study of oogenesis in a placental viviparous onychophoran describes oocyte differentiation, cell interactions and reveals various unusual cellular features. The viviparous onychophoran Plicatoperipatus jamaicensis has paired ovaries medially located, attached to the dorsal body wall by muscular terminal filaments. The rest of
E, Huebner, D J, Lococo
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Vitellogenesis and Viviparity

1987
In vertebrates, there are three principal modes of nutrition for developing embryos: (1) the laying down of food stores, synthesized in the liver, in the oocyte (vitellogenesis) (this is the most common mode in nonmammalian species); (2) the direct provision of nutrients to the developing young through the intermediary of the uterine wall by either ...
Ian P. Callard, S.-m. Ho
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Implications of Viviparity

1973
The many problems we face in our efforts to maintain the mammalian fetus in vitro justify a brief scrutiny of the special niche normally occupied by the mammalian fetus, and some consideration of its principal features. Such a survey reasonably begins in the realm of phytogeny, with the evolutionary aspects of viviparity, and the developmental problems
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The Evolution of Viviparity

Proceedings of the Royal Society of Medicine, 1968
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