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Structure, function, and evolution of the oviducts of squamate reptiles, with special reference to viviparity and placentation.
  • D. G. Blackburn
  • Biology, Medicine
  • The Journal of experimental zoology
  • 1 November 1998
TLDR
Cladistic analysis indicates that oviductal features associated with deposition of tertiary egg investments in reptiles reflect evolutionary convergence as well as secondary simplification, rather than a unidirectional trend towards increased specialization. Expand
Convergent Evolution of Viviparity, Matrotrophy, and Specializations for Fetal Nutrition in Reptiles and Other Vertebrates
Quantitative analyses based upon the superimposition of phylogenetic and reproductive data have revealed that viviparity has originated on at least 132 independent occasions among vertebrates, withExpand
Chorioallantoic placentation in squamate reptiles: Structure, function, development, and evolution
TLDR
Phylogenetic analyses suggest that placental organs have originated on more than 100 occasions among squamate reptiles, and indicate that three separate lineages have converged on substantial placentotrophy through the evolution of specialized histotrophic placentae. Expand
Evolution of vertebrate viviparity and specializations for fetal nutrition: A quantitative and qualitative analysis
TLDR
Phylogenetic analyses indicate that viviparity has originated independently in more than 150 vertebrate lineages, including a minimum of 115 clades of extant squamate reptiles, and substantial matrotrophy has arisen at least 33 times in these v Viviparous clades. Expand
Saltationist and punctuated equilibrium models for the evolution of viviparity and placentation.
TLDR
Empirical data and predictive tests on lizards and snakes indicate that placentae and a degree of placentotrophy have evolved repeatedly as necessary correlates of viviparity, not as subsequent modifications. Expand
Reptilian viviparity: past research, future directions, and appropriate models.
  • D. G. Blackburn
  • Biology, Medicine
  • Comparative biochemistry and physiology. Part A…
  • 1 December 2000
TLDR
Future studies and analyses should abandon assumptions of universal physiological mechanisms and a single historical sequence, in favor of the documentation of diversity in phylogenetic and quantitative terms. Expand
Histology of the late‐stage placentae in the matrotrophic skink Chalcides chalcides (Lacertilia; Scincidae)
TLDR
Morphologically, the mature placentae of C. chalcides are among the most specialized to have been described in reptiles, reflecting the substantial maternal‐fetal nutrient transfer that occurs in this species. Expand
Evolutionary Origins of Viviparity in the Reptilia. I. Sauria
TLDR
Reproductive mode data were extracted piecemeal from the literature and superimposed over currently accepted phylogenies to permit estimation of the minimum frequencies with which viviparity (live-bearing) has evolved in lizards, as well as to facilitate analysis of hypotheses that genetic sex-determination of the male-heterogametic type as weil as a tendency towards eggention preadapt a lineage for v Viviparity. Expand
Lactation: historical patterns and potential for manipulation.
TLDR
Mammalian diversity indicates that artificial selection and physiological manipulation of domestic artiodactyls has only modestly exploited the potential of mammary glands as a nutritional source for humans. Expand
Evolutionary Origins of Viviparity in the Reptilia. II. Serpentes, Amphisbaenia, and Ichthyosauria
TLDR
The discontinuous distribution of the origins of viviparity among the reptilian families supports the hypothesis that selective pressures, preadaptations, and constraints vary at high taxonomic levels. Expand
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