Aetosaurs

Aetosaurs (aetosaur /eɪˌɛtoʊˈsɔr/; order name Aetosauria /eɪˌɛtoʊˈsɔriə/; from Greek, ἀετός (aetos, "eagle") and σαυρος (sauros, "lizard")) are an extinct order of heavily armoured, medium- to large-sized Late Triassic herbivorous archosaurs. They have small heads, upturned snouts, erect limbs, and a body covered by plate-like scutes. All aetosaurs belong to the family Stagonolepididae. Two distinct subdivisions of aeotosaurs are currently recognized, Desmatosuchinae and Aetosaurinae, based primarily on differences in the morphology of the bony scutes of the two groups. Over 20 genera of aetosaurs have been described, and recently there has been controversy regarding the description of some of these genera.

Aetosaur fossil remains are known from Europe, North and South America, parts of Africa and India. Since their armoured plates are often preserved and are abundant in certain localities, aetosaurs serve as important Late Triassic tetrapod index fossils. Many aetosaurs had wide geographic ranges, but their stratigraphic ranges were relatively short. Therefore, the presence of particular aetosaurs can accurately date a site that they are found in.

Aetosaur remains have been found since the early 19th century, although the very first remains that were described were mistaken for fish scales. Aetosaurs were later recognized as crocodile relatives, with early paleontologists considering them to be semiaquatic scavengers. They are now considered to have been entirely terrestrial animals. Some forms have characteristics that may have been adaptations to digging for food. There is also evidence that some if not all aetosaurs made nests.

Read more about AetosaursDescription, History, Distribution, Biochronology, Naming Controversy

Other articles related to "aetosaurs, aetosaur":

Typothorax - Paleobiology
... Like all aetosaurs and many other early crurotarsans, Typothorax had erect hindlimbs held beneath the body ... Like other aetosaurs, there is a prominent deltopectoral crest on the humerus ... not specifically adapted for a fossorial lifestyle but had an ability to dig that other aetosaurs didn't have ...
Aetosaur
... Aetosaurs (aetosaur /eɪˌɛtoʊˈsɔr/ order name Aetosauria /eɪˌɛtoʊˈsɔriə/ from Greek, ἀετός (aetos, "eagle") and σαυρος (sauros, "lizard")) are an extinct order of heavily armoured ... All aetosaurs belong to the family Stagonolepididae ... Over 20 genera of aetosaurs have been described, and recently there has been controversy regarding the description of some of these genera ...
Chilenosuchus
... Chilenosuchus is an extinct genus of aetosaur ... it dates back to the late Carboniferous or early Permian, yet Chilenoasaurus is an aetosaur, and the first aetosaurs appeared in the Late Triassic ... there was initially much controversy as to whether or not the fossil was from a true aetosaur ...
Aetosaur - Biochronology
... Because species of aetosaurs typically have restricted fossil ranges and are abundant in the strata they are found in, they are useful in biochronology ... are the most common remains associated with aetosaurs, so a single identifiable scute can accurately date the layer it is found in ... Aetosaur biochronology -255 — – -250 — – -245 — – -240 — – -235 — – -230 — – -225 — – -220 — – -215 — – -210 — – -205 — – -200 ...
Aetosaurs - Naming Controversy
... In 2007, paleontologists at the New Mexico Museum of Natural History and Science in Albuquerque, New Mexico were accused of plagiarism in some of their published articles dealing with aetosaurs ... In late 2006, the genus Rioarribasuchus was erected as a replacement name for "Desmatosuchus" chamaensis in the museum's bulletin ...