Morphogenesis of placental membranes in the viviparous, placentotrophic lizard Chalcides chalcides (Squamata: Scincidae)

Journal of Morphology
Daniel G Blackburn, Ian P Callard

Abstract

In the scincid lizard Chalcides chalcides, females ovulate small ova and supply most of the nutrients for development by placental means. The yolk is enveloped precocially by extraembryonic ectoderm and endoderm during the gastrula stage, establishing a simple bilaminar yolk sac placenta. The shell membrane begins to degenerate at this time, resulting in apposition of extraembryonic and maternal tissues. A true chorioplacenta has developed by the early pharyngula stage, as has a choriovitelline placenta and the first stages of an omphaloplacenta. Although the choriovitelline membrane disappears rapidly, the omphaloplacenta spreads to occupy the entire abembryonic pole. The yolk cleft is not confluent with the exocoelom, and no omphalallantoic placenta develops. By the limb-bud stage, an allantoplacenta has been established, with a mesometrial placentome composed of interdigitating ridges of chorioallantois and uterine mucosa. The discovery of five distinct placental arrangements in this species, three of which are transitory and two of which have not previously been recorded in reptiles, emphasizes the need for accounts that specify ontogenetic stages and the precise identity and composition of squamate placental membranes. Con...Continue Reading

References

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Citations

Sep 2, 2003·Journal of Experimental Zoology. Part A, Comparative Experimental Biology·Alexander F Flemming, Daniel G Blackburn
Sep 2, 2003·Journal of Experimental Zoology. Part A, Comparative Experimental Biology·Daniel G BlackburnJennifer L Petzold
Feb 27, 2001·Journal of Morphology·A F Flemming, W R Branch
Jul 20, 2006·Journal of Morphology·Martha Patricia Ramírez-PinillaJ Fernando Carreño-Escobar
Apr 2, 2005·Journal of Morphology·Maricela VillagránJames R Stewart
Jun 17, 2005·Journal of Morphology·Arlette Hernández-FranyuttiLouis J Guillette
Jun 15, 2010·Journal of Morphology·Daniel G BlackburnKent D Dunlap
Nov 22, 2008·Evolution & Development·Luana PaulesuElisa Bigliardi
Dec 8, 2005·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Michael B Thompson, Brian K Speake
Jan 18, 2006·Journal of Morphology·Mari Carmen Uribe-AranzábalLouis J Guillette
Sep 24, 2019·Evolution & Development·James R Stewart, Daniel G Blackburn
Jan 21, 2003·Biology of Reproduction·Irving Rothchild
Oct 1, 2003·Journal of Morphology·Adriana Jerez, Martha Patricia Ramírez-Pinilla
May 15, 2015·Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution·Daniel G Blackburn
Jun 4, 2015·Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution·Daniel G Blackburn
Feb 3, 2004·Journal of Morphology·James R Stewart, Michael B Thompson
May 8, 2018·Journal of Experimental Zoology. Part A, Ecological and Integrative Physiology·James U Van Dyke, Oliver W Griffith
Jul 13, 2002·The Journal of Experimental Zoology·Jane E Girling
Dec 11, 2003·Journal of Morphology·Duperly Gómez, Martha Patricia Ramírez-Pinilla
Jun 10, 2015·Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution·James R Stewart
Jul 24, 2001·Journal of Morphology·A Jerez, M P Ramírez-Pinilla
Mar 17, 2012·Journal of Anatomy·Bridget F MurphyMichael B Thompson
Mar 4, 2015·Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution·Oliver W GriffithMichael B Thompson
Jan 5, 2021·Journal of Morphology·Daniel G Blackburn, James R Stewart
Jan 13, 2001·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·D G Blackburn
Jan 13, 2001·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·J R Stewart, M B Thompson
Jan 13, 2001·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·M B ThompsonB K Speake

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