New research suggests that the first reptiles, birds, and mammals may have given birth to live young, contrary to the belief that hard-shelled eggs were central to their evolution. (scitechdaily.com)
Researchers from Nanjing University and the University of Bristol have unveiled that the earliest mammals, reptiles, and birds might have given birth to live young. (scitechdaily.com)
2. a similar membrane in placental mammals that encloses a mostly hollow space and loses its nutritive function entirely as the placenta develops. (en-academic.com)
Lizards are a widespread group of squamate reptiles, with nearly 3800 species, ranging across all continents except Antarctica as well as most oceanic island chains. (absoluteastronomy.com)
Evolution of viviparity in squamate reptiles: reversibility reconsidered. (trincoll.edu)
Ancestral state reconstructions require biological evidence to test evolutionary hypotheses: a case study examining the evolution of reproductive mode in squamate reptiles. (trincoll.edu)
FETAL MEMBRANES1
Evolutionary Transformations of Fetal Membranes and Reproductive Strategies. (trincoll.edu)
Chorioallantoic membrane3
I used immunohistochemistry to localize calbindin-D 28K expression in the chorioallantoic membrane and yolk sac of two species of oviparous scincid lizards, Plestiodon fasciatus and Saproscincus mustelinus . (etsu.edu)
Calbindin-D 28K was detected in the chorioallantoic membrane and yolk sac of both lizard species by a polyclonal anti-snake calbindin antibody and a monoclonal anti-cow calbindin antibody. (etsu.edu)
Calbindin-D 28K was localized in the chorionic epithelium and allantoic epithelium of the chorioallantoic membrane and in endodermal cells scattered throughout the yolk mass of both species. (etsu.edu)
Amphibians3
In amphibians and reptiles, primary neurulation forms the whole neural tube, and the neural tube closes simultaneously along its length. (wikipedia.org)
The tuatara is a reptile endemic to New Zealand which, though it resembles most lizards, is actually part of a distinct lineage, order Sphenodontia. (absoluteastronomy.com)
Snakes are elongate, legless, carnivorous reptiles of the suborder Serpentes that can be distinguished from legless lizards by their lack of eyelids and external ears. (absoluteastronomy.com)
Localization of Calbindin-D 28k in Extra-Embryonic Membranes of Two Oviparous Scincid Lizards. (etsu.edu)
Yolk4
1. an extraembryonic membrane that encloses the yolk of eggs in birds, reptiles, and marsupials and that circulates nourishment from the yolk to the developing embryo. (en-academic.com)
1. a saclike vascular membrane containing yolk, an outgrowth from the ventral surface of very yolky vertebrate embryos, as those of fishes, birds, or reptiles, that supplies nourishment to the embryo 2. (en-academic.com)
Human embryos have a yolk sac, a membrane outside the embryo but connected by a tube (the yolk stalk) though the umbilical opening to the embryo s midgut. (en-academic.com)
yolk sac tumor - a malignant germ cell tumor of children that represents a proliferation of both yolk sacendoderm and extraembryonic mesenchyme. (en-academic.com)
Mesozoic1
In the Jurassic and Cretaceous, later in the Mesozoic, the reptile lineage was dominant, most notably in the form of dinosaurs. (inverse.com)
Amphibian1
Amphibian and Reptile Conservation (in press). (trincoll.edu)
Eggs1
Today, terrestrial vertebrates that produce eggs that contain an embryo surrounded by extra-embryonic membranes are descended either from the lines Synapsida or Reptilia, lineages that both descend from a common ancestor. (inverse.com)
Viviparous2
Viviparous placentotrophy in reptiles and the parent - offspring conflict. (trincoll.edu)
History of reptile placentology: Cesare Studiati's 1855 description of placentation in a viviparous lizard. (trincoll.edu)
Species1
Sphenodontia is an order of lizard-like reptiles that includes only one living genus, the tuatara , and only two living species. (absoluteastronomy.com)
Development2
Fetal membrane ultrastructure and development in the oviparous milksnake Lampropeltis triangulum (Colubridae), with reference to function and evolution in snakes. (trincoll.edu)
Beauty and the development finds embryonic-extraembryonic as it is this middle, with Villeneuve's stage Completing completed as a Aircraft PMA for enthusiasts and Beaumont ruptures seeing obligated as a entire contribution for posts. (need4speed.com)
In REPTILES and BIRDS, it adheres to the shell and allows exchange of gases between the egg and its environment. (rush.edu)
Recent1
Professor Benton concluded: "Our work, and that of many others in recent years, has consigned the classic 'reptile egg' model of the textbooks to the wastebasket. (scitechdaily.com)
Cells1
and 2) bikonts (having a common ancestor with 2 flagella) are those organisms whose cells possess nuclei and other membrane-bound organelles, organisms which exist in the kingdoms of Animalia, Protista, Fungi, Plants, and Monera. (emergentearth.com)
Today's reptiles represent 2 main lines: Parareptilia or Chelonia ( turtles ) and Eureptilia or Diapsida, which contains the Lepidosauria (Tuatara, lizards and snakes ) and Archosuria (crocodilians and birds). (thecanadianencyclopedia.ca)
The reptile heart is 3-chambered, except in crocodilians and birds, which have a 4-chambered heart. (thecanadianencyclopedia.ca)
Like amphibians, reptiles (exclusive of the birds) are ectothermic, eg, they have a relatively low metabolic rate and depend largely on external heat to attain the temperature at which they function best. (thecanadianencyclopedia.ca)
Amphibians and reptiles2
In amphibians and reptiles, primary neurulation forms the whole neural tube, and the neural tube closes simultaneously along its length. (wikipedia.org)
Alternatively, these structures could have gradually evolved in live-bearing intermediates between amphibians and reptiles. (albertkharris.com)
Reptiles are a group of vertebrate animals that, like mammals , produce an amniote egg, with extra-embryonic sacs for waste, yolk, and protection, and often possessing a shell, particularly if released by the female before development of the embryo is completed. (thecanadianencyclopedia.ca)
Utilization of dehydrated deepithelialized human amnion/chorion membrane (dHACM) has proven to be an important adjunct when performing minimally invasive grafting for implant procedures. (imingo.net)
Dehydrated human amnion/chorion membrane Tissue regeneration and the use of the matrix allograft became the gold standard in the treatment of non-wound healing and tissue repair in these years. (imingo.net)
However, the number of patients included in the previous literatures was small and the safety profile of human amnion/chorion membrane therapy was not concerned. (imingo.net)
Amniote1
The key to reptile success in invading the land was the amniote egg with a protective shell and embryonic membranes. (thecanadianencyclopedia.ca)
Vitelline1
It is sometimes called the vitelline sac, which should not be confused with the vitelline membrane of the egg. (lecturio.com)
Exist1
and 2) bikonts (having a common ancestor with 2 flagella) are those organisms whose cells possess nuclei and other membrane-bound organelles, organisms which exist in the kingdoms of Animalia, Protista, Fungi, Plants, and Monera. (emergentearth.com)
Cell1
A rapid change in the membrane potential of an excitable cell, caused by stimulus-triggered, selective opening and closing of voltage-sensitive gates in sodium and potassium ion channels. (web.id)
The movement of a substance across a biological membrane against its concentration or electrochemical gradient, with the help of energy input and specific transport proteins. (web.id)
Enter1
A) opens the egg's nuclear membrane to allow haploid sperm DNA to enter. (easynotecards.com)