Sentences with word «archosaur»

«Eggshell porosity can be used to infer the type of nest built by extinct archosaurs.»

«Now that we know the diagnostic features of this group of archosaurs, everybody working on middle Triassic rocks will be looking for something similar.»

The researchers found a strong correlation between eggshell porosity and covered or exposed nest types among extant archosaurs, which indicates that eggshell porosity may be used as a proxy for nest type, which may help predict nest type in extinct taxa.

Knowledge about dinosaur nests may provide insight into the evolution of nesting and reproductive behaviors among archosaurs, a group that includes living birds and crocodilians, as well as extinct dinosaurs.

In its wake arose a group of egg - laying reptile precursors called archosaurs, the common ancestors of dinosaurs, flying reptiles known as pterosaurs, and crocodiles.

The earliest, or basal, dinosaurs evolved from archosaurs, a branch off the reptile line, more than 230 million years ago — but exactly when remains a question.

The earliest bird - line archosaurs and the assembly of the dinosaur body plan.

However, the idea fell out of favour in the early 20th century when Gerhard Heilmann, a Danish artist and scientist, published a hugely influential book, The Origin of Birds, arguing that birds evolved directly from a primitive archosaur, a reptilian group which also gave rise to dinosaurs, pterosaurs and crocodiles.

The lack of corroborating fossils makes it hard to be positive that Rotodactylus was an early member of the dinosaur line (and not, say, a closely related archosaur), but if Haubold is correct, dinosaurs emerged earlier and took longer to dominate than scientists believed.

These dino - pioneers, such as Herrerasaurus, were «fleet - footed carnivores,» Persons says, thanks in part to an evolutionary advance in hip joints: Unlike the sprawling, reptilian stance of other archosaurs, dinosaurs had an erect posture, with their legs under their bodies.

Their numbers dwindled, creating an ecological opening for archosaurs, and eventually dinosaurs.

The tendency for adults to care for their offspring beyond birth is a key feature of the reproductive biology of living archosaurs — birds and crocodilians — with the latter protecting their young from potential predators and birds, not only providing protection but also provision of food.

We argue here that the Aust bones, previously identified as those of dinosaurs or large terrestrial archosaurs, are jaw fragments from giant ichthyosaurs.»

Teleocrater (meaning «completed basin», in reference to its closed acetabulum) is a genus of avemetatarsalian archosaur from the Middle Triassic Manda Formation of Tanzania.

The reptiles were mainly synapsids (Pelycosaurs and Therapsids) that appeared in the Upper Carboniferous, and were bulky, cold - blooded animals with small brains Towards the very end of the Permian the first archosaurs appear, the ancestors of the soon to follow Triassic dinosaurs.

Unfortunately, little remains of prehistoric nests, and most information on extinct archosaurs is only gleaned indirectly through comparison with living relatives.

Among extant archosaurs, two general types of nests are observed: open nests, where the eggs are uncovered and built by species that brood their eggs; and covered nests, built by species that incubate their eggs using external heat sources.

Changes in the presence of growth factors produced the teeth, which were consistent with those of archosaurs (the group that includes birds, nonavian dinosaurs, and crocodilians).

Extinct archosaurs» eggshell porosity may be used as a proxy for predicting covered or exposed nest types, according to a study published November 25, 2015 in the open - access journal PLOS ONE by Kohei Tanaka from the University of Calgary and colleagues.

The authors of this particular study proposed a statistically rigorous approach to infer nest type based on large datasets of eggshell porosity and egg mass compiled for over 120 extant archosaur species and 29 extinct archosaur taxa.

Pterosaurs: Like dinosaurs, these flying animals are archosaurs (so are crocodiles) and lived during the same timespan.

The Archosauromorph reptiles, and most notably the archosaurs, diapsid reptiles that first appeared during the late Permian, inexorably displaced the synapsids that had dominated the land during the Permian.

Along with the dinosaurs and some other extinct groups, these are part of a group called the archosaurs (which means «ruling reptile