Alvarezsaurus was a genus of small carnivorous dinosaurs that existed during the Late Cretaceous age. The Alvarezsaurus was a small dinosaur. However, it was still a larger one compared to the other members of the group. This dinosaur is believed to be the ancestor of modern-day birds. They were recovered from the Argentine range of the Formation. This dinosaur group was the first group of their family that was discovered. Later many other groups were discovered from different parts of the that had features similar to an Alvarezsauridae.
Therefore the family name was a replica of the name of this genus. In spite of that, now, when many Alvarezsaurids have been discovered throughout the world, the type genus of the family, the Alvaresaurus, has become the least understood and most incomplete dinosaur currently. Rather its closely related genera like Shuvuuia and Mononykus are better-known members of the family currently than them. Another name of the Alvarezsaurus is also known to be Alvarezsaur. To know more about this dinosaur, keep on reading these amazing facts.
The Alvarezsaurus formed a major part of the Alvarezsauridae family along with other genera like Shuvuuia and Mononykus. The name Alvarezsaurus is pronounced as Al-vah-rez-sore-us in English. Their name was given by Jose Bonaparte, and it translates to Alvarez's Lizard.
The Alvarezsaurus was a type of bipedal theropod dinosaur that lived during the Late Cretaceous period on earth. It was considered to be one of the basal dinosaurs of the Alvarezsauridae family since they were discovered first in their family. The fossils of A. calvoi were discovered in the late 20th century by Jose Bonaparte in Argentina.
The Alvarezsaurus were found on earth during the Late Cretaceous period. They came into existence around 89 million years ago and lasted till 85 million years ago.
The Alvarezsaurus became extinct when the Cretaceous stage was still ongoing. The dinosaur became extinct 85 million years ago, which was approximately around 20 million years before the cretaceous epoch ended.
The Alvarezsaurus fossil was discovered from Bajo de la Carpa Formation in Argentina. It is believed that they lived in Patagonia, a supercontinent including South America and Africa.
The Alvarezsaurus preferred to live in terrestrial habitats. Their diet possibly included local insects and ants. Therefore living near the nesting areas of insects helped them to gather food easily.
The Alvarezsaurus was a small dinosaur but whether it lived in groups or in solitude is unknown.
The Alvarezsaurus was a genus of the Late Cretaceous period. The entire genus lasted for about four million years on earth. The existence of such dinosaurs dates back to 85-89 million years ago.
Like every other dinosaur, the Alvarezsaurus also reproduced by laying eggs. The reproduction method was oviparous. After mating, females laid eggs, and juveniles emerged from the eggs. The rest of the information about their breeding process is missing.
The Alvarezsaurus was a small carnivorous dinosaur with a long tail; they were found during the Late Cretaceous period. The structure of the leg of this dinosaur indicates that it might have been a fast runner. The caudal vertebrae that were recovered had unique features. In the transverse section of the vertebrae, subtriangular and laterally directed processes were observed. It also has ventrally sharp central.
Similar features were also seen in the other dinosaurs of the family. Each vertebra of the dinosaur supported prezygapophyses, but their spinal processes were very poorly developed. It is possible that they absolutely lacked the spinal processes. The scapula was smaller in comparison to the dinosaurs of the other genera, and they lacked the fused astragalus and calcaneum, unlike its relatives. The dinosaur had a long tail.
The length of the tail covered half the length of the body. They had a long s-shaped neck with short hands and long limbs. The arms possibly had a single digit which ended in long and strong claws with as seen in the Alarezsaurids. They probably had feathers or feather-like structures and bird-like hands. So before classifying it as a dinosaur, the Alvarezsaurus was known to be a flightless bird. They were different from the other dinosaurs of the Late Cretaceous and were considerably larger than the other genera of Alvarezsaurids. The name of this lizard-hipped dinosaur means Alvarez's lizard.
The total number of bones present in the Alvarezsaurus skeleton is unknown; the entire bone structure of A. cavoli has not been recovered from their range. This type of genus of the dinosaur is the least understood one among the other genera. They are only known from the partial pelvis, partial hindlimb, teeth, and the vertebrae that have been recovered from the Bajo de la Carpa Formation.
Dinosaurs communicated through vocalization. Their developed visuals also help them to communicate.
The average Alvarezsaurus size is estimated to be around 4.6 ft (1.4 m). They are two times smaller in length than a Gondwanatitan.
The Alvarezsaurus were small and fast-running dinosaurs, but their speed has not been estimated.
The weight of an Alvarezsaurus ranged between 5-20 lb (2.27-9.1 kg).
The male and the female dinosaurs do not have any specific names. Both of them are referred to as Alvarezasaurus.
A baby dinosaur is referred to as a nestling or hatchling.
The Alvarezsaurus was carnivorous in nature. They can also be identified as insectivorous since they mainly ate insects. They possibly used their claws to dig out the termites and ants. They probably had pointed snout, which could be an adaptation to feed on insects. However, since their skull has not been discovered, there is no strong evidence for this fact.
Although they were carnivores, they mainly fed on insects and termites. This makes them less aggressive than the more powerful flesh-eating dinosaurs.
The Alvarezsaurus was thought to be the earliest flightless bird in the world, but this possibility is now discarded by researchers; they now include them as one of the Maniraptora.
The name Alvarezsaurus denotes one of the members of the Alvarezsauridae family of Late Cretaceous dinosaurs whose fossil was discovered from the Bajo de la Carpa Formation in South America. The Alvarezsaurus was first discovered in 1991 by the paleontologist Jose Bonaparte. He named the species Alvarezsauruus after the name of Don Gregorio Alvarez. Alvarez was a historian and geologist of Argentina.
Often Don Gregorio Alvarez is confused with another amateur paleontologist and physicist, Luis Alvarez. Luis Alvarez was the author of the Alvarez Theory of Extinction which described how an asteroid attack was responsible for the extinction of dinosaur species from earth.
The name of the type species of the Alvarezsaurus is Alvarezsaurus calvoi. The Greek term Sauros means lizard in Engish. So the complete name Alvarezsaurus translates to Alvarez's lizard. The explanation behind naming their type species Alvarezsaurus calvoi is unknown.
The Alvarezsaurus is the type genus of the Alvarezsauridae family of dinosaurs. The dinosaur is named after the geologist and historian Don Gregorio Alvarez of Argentina. In 1991, the paleontologist Jose Bonaparte found an incomplete skeleton in the Bajo de la Carpa Formation. It was located in Patagonia, which is currently known as Argentina.
Bonaparte was the first one to describe the type species Alvarezsaurus calvoi. It was the first Alvarezssaurid ever described after the discovery of the family. He was also responsible for naming the family of Alvarezsaurids and strongly suggested that these dinosaurs are closely related to the group of ornithomimid dinosaurs.
After Bonaparte, several other paleontologists discovered a few types of dinosaurs having features similar to the Alvarezsaurid dinosaur but were classified under distinct genera. At present, many specimens of Alvarezsaurids have been discovered from different parts of the world, and they are classified under distinct genera. Most of these groups of dinosaurs belonged to the Late Cretaceous period.
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Second image by FunkMonk (Michael B. H.)