Evolution of placentotrophy: using viviparous sharks as a model to understand vertebrate placental evolution

  title={Evolution of placentotrophy: using viviparous sharks as a model to understand vertebrate placental evolution},
  author={Alice L Buddle and James U. Van Dyke and Michael B. Thompson and Colin A. Simpfendorfer and Camilla M. Whittington},
  journal={Marine and Freshwater Research},
Reproducing sharks must provide their offspring with an adequate supply of nutrients to complete embryonic development. In oviparous (egg-laying) sharks, offspring develop outside the mother, and all the nutrients required for embryonic growth are contained in the egg yolk. Conversely, in viviparous (live-bearing) sharks, embryonic development is completed inside the mother, providing offspring with the opportunity to receive supplementary embryonic nourishment, known as matrotrophy. Viviparous… 
The evolution and physiology of male pregnancy in syngnathid fishes
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Morphological basis for maternal nutrient provision to embryos in the viviparous fish Ataeniobius toweri (Teleostei: Goodeidae)
In viviparous Mexican fishes of the family Goodeidae, embryos develop in the maternal ovarian lumen. They typically absorb maternal nutrients during gestation by means of “trophotaeniae,” that is,
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Viviparous placentotrophy in reptiles and the parent-offspring conflict.
  • D. G. Blackburn
  • Medicine
    Journal of experimental zoology. Part B, Molecular and developmental evolution
  • 2015
It is suggested that histotrophy gives pregnant females greater control over nutrient synthesis, storage, and delivery than hemotrophic transfer, reflecting maternal preeminence in any potential parent-offspring competition over nutrient investment.
A review of the evolution of viviparity in lizards: structure, function and physiology of the placenta
Reliance on provision of substantial organic nutrient is correlated with the regional specialisation of the chorioallantoic placenta to form a placentome for nutrient uptake, particularly lipids, and the further development of the gas exchange capabilities of the other parts of the Chorioallantois.
Evolution of placentation among squamate reptiles: recent research and future directions.
  • J. R. Stewart, M. Thompson
  • Biology
    Comparative biochemistry and physiology. Part A, Molecular & integrative physiology
  • 2000
Evolution of vertebrate viviparity and specializations for fetal nutrition: A quantitative and qualitative analysis
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.
Male pregnancy in seahorses and pipefish: beyond the mammalian model
Understanding the changes associated with the parallel evolution of male pregnancy in the two major syngnathid lineages will help to identify key innovations that facilitated the development of this unique form of reproduction and, through comparison with other forms of live bearing, may allow the identification of a common set of characteristics shared by all viviparous organisms.
Evolution and morphogenesis of the placenta in sharks
The progressive shift from reliance on yolk, to histotroph, then to the placenta mirrors the probable stages in the evolution of placentation in sharks, which involves modifications of existing maternal and fetal membranes.
High Food Abundance Permits the Evolution of Placentotrophy: Evidence from a Placental Lizard, Pseudemoia entrecasteauxii
It is suggested that high food abundance and ability to abort and cannibalize poor-quality offspring are permissive factors necessary for placentotrophy to be a viable strategy of reproductive allocation.
Facultative Placentotrophy and the Evolution of Squamate Placentation: Quality of Eggs and Neonates in Virginia striatula
A combination of reproductive mode and embryonic nutritional pattern results in a functional-structural complex on which selection can act, should suitable conditions arise, to produce obligate placentotrophy and yolk reduction.
Viviparity: The Maternal-Fetal Relationship in Fishes
The maternal-fetal trophic relationships in each of the major groups of fishes are systematically reviewed and Pertinent anatomical, histological, ultrastructural, developmental, physiological, and biochemical studies are considered.
The evolution of viviparity: molecular and genomic data from squamate reptiles advance understanding of live birth in amniotes.
Squamate reptiles (lizards and snakes) are an ideal model system for testing hypotheses regarding the evolution of viviparity (live birth) in amniote vertebrates, and studies of the emergence of v Viviparity in squamates should inform hypotheses of the evolution in all amniotes, including mammals.