How To Use Archosaur In A Sentence
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Towards the end of the Triassic, several new and more advanced archosaur groups evolved from the thecodonts.
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Continue reading "Chicken, archosaur...same difference" on Pharyngula
Chicken, archosaur...same difference - The Panda's Thumb
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I also read more of the December issue of the Journal of Vertebrate Paleontology — "Comparison and biomechanical interpretations of the vertebrae and osteoderms of Cacops aspidephorus and Dissorophus multicinctus (Temnospondyli; Dissorophoridae)," and "A possible new ctenosauriscid archosaur from the Middle Triassic Manda Beds of Tanzania.
What I Did During My Plague Vacation ( by Me)
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By demonstrating one-way or "unidirectional" airflow within the lungs of alligators, the new study - published in the Friday, Jan. 15 issue of the journal Science - means that such a breathing pattern likely evolved before 246 million years ago, when crocodilians split from the branch of the archosaur family tree that led to pterosaurs, dinosaurs and birds.
PhysOrg.com - latest science and technology news stories
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And the presence of the glands in this location might explain another unusual aspect of metriorhynchid cranial anatomy, namely the strange elongate, groove-like antorbital fossae present in these animals (the antorbital fossa is an accessory opening present on the side of the skull in archosaurs).
My party and those marvellous metriorhynchids
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Belief in increasing archosaur homeothermy stems from the earlier discussion of the apparent change in posture.
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I may have to send this news article to school with her: investigators have found that a mutation in chickens causes them to develop teeth—and the teeth resemble those of the common ancestor of alligators and chickens, an archosaur.
Chicken, archosaur...same difference - The Panda's Thumb
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Tyrannosaurs are surprisingly common in many North American fossil beds, especially their large, serrated teeth which they shed periodically like most archosaurs.
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Among the remnants are rare fragments of land life that survived the same period, including part of a conifer plant and the tooth of an archosaur reptile.
Fossil hunters uncover complete 252m year-old underwater world
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There were three distinctive characteristics about the archosaurs that paleontologists discovered marked them off from their antecedents.
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The name ‘bird crocodile’ seems to nicely describe all the great archosaurs of Mesozoic, combining as they did features of both crocodiles and birds.
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By demonstrating one-way or "unidirectional" airflow within the lungs of alligators, results of the new study suggest that such a breathing pattern likely evolved before 246 million years ago, when crocodilians split from the branch of the archosaur family tree that led to pterosaurs, dinosaurs and birds.
RedOrbit News - Technology
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And there's been more from the latest Journal of Vertebrate Paleontology, papers on the "rauisuchian" archosaur Batrachotomus kupferzellensis; the ontogeny of Stegosaurus; ontogenetic and taxonomic implications of pattern and transition of surficial bone texture of the centrosaurine frill; and Adeopapposaurus, a new prosauropod dinosaur from Argentina.
"Fill the night with stories. The legend grows."
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Finally, ancestral archosaurs had a double row of bony plates (called scutes, or osteoderms) running along the backbone.
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In the June issue of the Journal of Vertebrate Paleontology, which I'm only just now getting around to, I read the type description of the new species of "rauisuchid" archosaur Postosuchus alisonae from the Triassic of North Carolina.
At Least I'm Not At Dragon*Con (Part One)
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In the south, therapsids like sheep-sized herbivorous traversodonts predominated; in the north, archosaurs were more common.
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These creatures succeeded the pelycosaurian synapsids as the rulers of the land, until they in turn were supplanted by the archosaurs during the early Triassic.
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Pterosaurs are in fact a sister group of crocodilians and dinosaurs (including birds) in the archosaur clade.
Darwinopterus, the New Flying Reptile
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The crurotarsan archosaur - a distant relative of today's crocs - were 40ft long, ten tons and had 45cm serrated teeth.
The Sun
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Belief in increasing archosaur homeothermy stems from the earlier discussion of the apparent change in posture.
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Extant archosaurs, crocodilians and birds, employ a two-part stomach with a thin-walled, enzyme-producing anterior, the proventriculus, followed by a thick-walled muscular gizzard.
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The aetosaurs, or Stagonolepididae, were large herbivorous armoured archosaurs, and an important characteristic part of Late Triassic faunas.
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In all but the role of small insectivore, omnivore, and rodent-like herbivore, the therapsids were eventually supplanted by the archosaurs.
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I may have to send this news article to school with her: investigators have found that a mutation in chickens causes them to develop teeth—and the teeth resemble those of the common ancestor of alligators and chickens, an archosaur.
Chicken, archosaur...same difference - The Panda's Thumb
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Minimally, this specimen proves that the most featherlike structures in a non-avian Mesozoic vertebrate are found in a late Triassic basal archosaur, a thecodont.
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Following the extinction of the Permian therapsids due to the end Permian-extinction, most of the large animals that populated Pangea were archosaurs or archosauromorphs.
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And the presence of the glands in this location might explain another unusual aspect of metriorhynchid cranial anatomy, namely the strange elongate, groove-like antorbital fossae present in these animals (the antorbital fossa is an accessory opening present on the side of the skull in archosaurs).
Archive 2006-07-01
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The archosaur skull includes two new fenestra (skull openings).
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Other archosaurs included the pterosaurs, relatives of dinosaurs but not true dinosaurs.
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And the presence of the glands in this location might explain another unusual aspect of metriorhynchid cranial anatomy, namely the strange elongate, groove-like antorbital fossae present in these animals (the antorbital fossa is an accessory opening present on the side of the skull in archosaurs).
Archive 2006-07-01
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On land there was a major faunal turnover in which labyrinthodont amphibians, early reptile groups, and mammal-like reptiles died out and were replaced by archosaurs, lepidosaurs, and mammals.
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I stayed in (too weary for eyes on me, and the autumn sky) and read "Superiority, Competition, and Opportunism in the Evolutionary Radiation of Dinosaurs" (Science, 12 September 2008), which examines the question of just how dinosaurs managed to come out of the Triassic so much better off than their crurotarsan contemporaries (non-dinosaurian archosaurs, including phytosaurs, aetosaurs, 'rauisuchians,' etc.).
"Hallways...always..."
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In any event, the semilunar depression is a hallmark of archosauriforms, but is unknown in crown group archosaurs.
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The ancestral archosaur was a predator that could probably locomote on two or four legs.
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I've been making my way through the September 2008 Journal of Paleontology, and so there was "A new desmatosuchine aetosaur (Archosauria; Suchia) from the Upper Triassic Tecovas Formation (Dockum Group) of Texas," "A juvenile skull of the primitive African ornithischian dinosaur Heterodontosaurus tucki from the 'Stormberg' of South Africa," and "The anatomy, affinity, and phylogenetic significance of Illemoraspis kirkinskayae (Osteostraci) from the Devonian of Siberia.
"The lengths that I will go to, the distance in your eyes..."
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This is an example of convergent evolution; synapsids and archosaurs evolved these features independently.
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Paleontologists Dingus and Rowe linked the dinosaur ancestry of birds with the origin of flight from the ground up, and the thecodont (basal archosaur) hypothesis with the origin of flight from the trees down.
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Such a pattern likely arose in the common ancestor of birds, dinosaurs, and alligators--called archosaurs--during the Triassic period, 251 to 199 million years ago.
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At the same time, the broad, dry plains of equatorial Pangea provided a proving ground for a strange new group of lightweight, but large-bodied, archosaurs - the dinosaurs.
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The aetosaurs, or Stagonolepididae, were large herbivorous armoured archosaurs, and an important characteristic part of Late Triassic faunas.
