archosaur

(redirected from Archosaurs)
Also found in: Thesaurus.

ar·cho·saur

 (är′kə-sôr′)
n.
Any of various vertebrates of the group Archosauria, having a single opening in each side of the skull in front of the eye socket, and including the dinosaurs, birds, pterosaurs, and modern crocodilians.

[New Latin Archosauria, subclass name : Greek arkhos, ruler + Greek sauros, lizard.]

ar′cho·saur′i·an n. & adj.

archosaur

(ˈɑːkəˌsɔː)
n
(Animals) any of a group of reptiles consisting of dinosaurs, pterosaurs, modern birds, modern crocodiles and extinct relatives of crocodiles, all having a diapsid skull

ar•cho•saur

(ˈɑr kəˌsɔr)

n.
any reptile of the subclass Archosauria, including the dinosaurs, pterosaurs, and crocodilians.
[1965–70; < New Latin Archosaurus < Greek árcho(s) leader, ruler + saûr(os) -saur]

ar·cho·saur

(är′kə-sôr′)
Any of a mostly extinct group of reptiles which includes the dinosaurs, pterosaurs, and the modern crocodiles and other crocodilians.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.archosaur - extinct reptiles including: dinosaursarchosaur - extinct reptiles including: dinosaurs; plesiosaurs; pterosaurs; ichthyosaurs; thecodonts
diapsid, diapsid reptile - reptile having a pair of openings in the skull behind each eye
Archosauria, subclass Archosauria - a large subclass of diapsid reptiles including: crocodiles; alligators; dinosaurs; pterosaurs; plesiosaurs; ichthyosaurs; thecodonts
dinosaur - any of numerous extinct terrestrial reptiles of the Mesozoic era
flying reptile, pterosaur - an extinct reptile of the Jurassic and Cretaceous having a bird-like beak and membranous wings supported by the very long fourth digit of each forelimb
thecodont, thecodont reptile - presumably in the common ancestral line to dinosaurs and crocodiles and birds
ichthyosaur - any of several marine reptiles of the Mesozoic having a body like a porpoise with dorsal and tail fins and paddle-shaped limbs
plesiosaur, plesiosaurus - extinct marine reptile with a small head on a long neck a short tail and four paddle-shaped limbs; of the Jurassic and Cretaceous
nothosaur - extinct marine reptile with longer more slender limbs than plesiosaurs and less completely modified for swimming
References in periodicals archive ?
The scientists said it appeared after a large group of reptiles called archosaurs evolved into two branches; one, a bird-branch, evolved into dinosaurs and eventually birds, the other evolved into today's crocodiles and alligators.
The scientists said it appeared after a large group of reptiles called archosaurs evolved into two branches; one, a birdbranch, evolved into dinosaurs and eventually birds, the other evolved into today's crocodiles and alligators.
Dinosaurs belong to a larger group called archosaurs that about 250 million years ago cleaved into two branches: crocodilians in one and another that includes dinosaurs, extinct flying reptiles called pterosaurs, and birds, which evolved from feathered dinosaurs.
edu/2016/07/11/dinosaurs-may-have-cooed-like-doves) Chad Eliason , a postdoctoral researcher at The University of Texas Jackson School of Geosciences and the study's co-author, said: "Our results show that closed-mouth vocalization has evolved at least 16 times in archosaurs, a group that includes birds, dinosaurs and crocodiles.
Archosaurian reptiles from the Evangeline Member comprise various taxa of crocodile-line archosaurs (Pseudosuchia) (Figs.
1996): Closure of neurocentral sutures during crocodilian ontogeny: implications for maturity assessment in fossil archosaurs.
But Farmer cautions that because lizard lungs have a different structure than bird and alligator lungs, it is also possible that one-way airflow evolved independently about 30 million years ago in the ancestors of monitor lizards and about 250 million years ago in the archosaurs, the group that gave rise to alligators, dinosaurs and birds.
Since this initial work, additional studies have been conducted on the vertebrate faunas of the Woodbine Formation, most notably on the Woodbine archosaurs (Lee 1997; Head 1998; Winkler & Jacobs 2002; Main 2005).
Today the tree is divided into three main branches (note that the pterosaurs and crurotarsans are archosaurs but not dinosaurs).
Pterosaurian archosaurs were the dominant group of flying reptiles along most of the Cretaceous (WANG et al.
The breathing method is believed to have first appeared in ancient reptiles called archosaurs which dominated the Earth 251 million years ago.
Dinosaurs and crocodiles belong to a group of large reptiles known as archosaurs, which prowled the earth during the Mesozoic Era, some 256 million years ago, when man's nearest ancestors were primitive mammals no bigger or complex than the common shrew.