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Placentation in the Viviparous Lizard Trachylepis vittata from Lebanon

Fida Nassar

Abstract


Placentation was investigated in the viviparous lizard Trachylepis vittata in two populations from distinct locations in Lebanon: an isolated coastal population from Tripoli Palm Island — and a continental high altitude population from Mount Sannine. No differences in the formation of extraembryonic membranes were found between the two locations. Histological examination showed a type I chorioallantoic placenta and an omphaloplacenta. Viviparity does not limit the altitudinal distribution of T. vittata and is not accompanied by a highly specialized placental structure.

Keywords


viviparity; extraembryonic membranes; chorioallantois; lecithotrophy; isolated yolk mass.

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References


Albergotti L. C. and Guillette L. J., Jr. (2011) “Viviparity in Reptiles: Evolution and Reproductive Endocrinology,” in: D. O. Norris and K. H. Lopez (eds.), Hormones and Reproduction of Vertebrates: Reptiles, Acad. Press, pp. 247 – 275.

Blackburn D. G. (1993), “Chorioallantoic placentation in Squamate reptiles: structure, function, development and evolution,” J. Exp. Zool., 266(5), 414 – 430.

Blackburn D. G. (1998), “Structure, function, and evolution of the oviducts of squamate reptiles, with special reference to viviparity and placentation,” J. Exp. Zool., 282(4/5), 560 – 617.

Blackburn D. G. (2000), “Reptilian viviparity: past research, future directions, and appropriate models,” Comp. Biochem. Physiol., 127(4), 391 – 409.

Blackburn D. G. (2006), “Squamate reptiles as model organism for the evolution of viviparity,” Herpetol. Monogr., 20(1), 131 – 146.

Blackburn D. G. (2015), “Evolution of vertebrate viviparity and specializations for fetal nutrition: A quantitative and qualitative analysis,” J. Morphol., 276(8), 961 – 990.

Blackburn D. G. and Flemming A. F. (2010), “Reproductive specializations in a viviparous African skink and its implications for evolution and conservation,” Herpetol. Conserv. Biol., 5(2), 263 – 270.

Blackburn D. G. and Flemming A. F. (2012), “Invasive implantation and intimate placental associations in a placentotrophic African lizard, Trachylepis ivensii (Scincidae),” J. Morphol., 273(2), 137 – 159.

Blackburn D. G. and Vitt L. J. (2002), “Specializations of the chorioallantoic placenta in the Brazilian scincid lizard, Mabuya heathi: A new placental morphotype for reptiles,” J. Morphol., 254(2), 121 – 131.

Dufaure J. and Hubert J. (1961), “Table de développement du lézard vivipare: Lacerta (Zootoca) vivipara Jacquin,” Arch. Anat. Micr. Morphol. Exp., 50, 309 – 328.

Jerez A. and Ramírez-Pinilla M. P. (2001), “The allantoplacenta of Mabuya mabouya (Sauria, Scincidae),” J. Morphol., 249(2), 132 – 146.

Jerez A. and Ramírez-Pinilla M. P. (2003), “Morphogenesis of extraembryonic membranes and placentation in Mabuya mabouya (Squamata, Scincidae),” J. Morphol., 258(2), 158 – 178.

Nassar F., Challita M., Sadek R., and Hraoui-Bloquet S. (2013), “Sexual dimorphism and female reproductive cycle in the scincid lizard Trachylepis vittata (Olivier, 1804) in Lebanon (Reptilia: Scincidae),” Zool. Middle East, 59(4), 297 – 301.

Nassar F. and Hraoui-Bloquet S. (2014), “Distribution and male reproductive system of the Bridled Mabuya Trachylepis vittata (Olivier, 1804). (Reptilia: Scincidae), in Lebanon,” Zool. Middle East, 60(4), 314 – 319.

Qualls C. P. and Andrews R. M. (1999), “Cold climates and the evolution of viviparity in reptiles: cold incubation temperatures produce poor-quality offspring in the lizard, Sceloporus virgatus,” Biol. J. Linn. Soc., 67(3), 353 – 376.

Ramírez-Pinilla M. P., De Pérez G., and Carreño-Escobar J. F. (2006), “Allantoplacental ultrastructure of an Andean population of Mabuya (Squamata, Scincidae),” J. Morphol., 267(10), 1227 – 1247.

Shine R. (1984), “Physiological and ecological questions on the evolution of reptilian viviparity,” in R. S. Seymour (ed.), Respiration and Metabolism of Embryonic Vertebrates, Springer Netherlands, pp. 147 – 154.

Shine R. (1985), “The evolution of viviparity in reptiles: an ecological analysis,” in: C. Gans and F. Billet (eds.), Biology of the Reptilia, John Wiley and Sons, New York, pp. 604 – 694.

Stewart J. R. (1993), “Yolk sac placentation in reptiles: structural innovation in a fundamental vertebrate fetal nutritional system,” J. Exp. Zool., 266(5), 431 – 449.


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