FOR AGES 3 YEARS TO 18 YEARS
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Kidadl provides inspiration to entertain and educate your children. We recognise that not all activities and ideas are appropriate and suitable for all children and families or in all circumstances. Our recommended activities are based on age but these are a guide. We recommend that these ideas are used as inspiration, that ideas are undertaken with appropriate adult supervision, and that each adult uses their own discretion and knowledge of their children to consider the safety and suitability.
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Achillesaurus is a very interesting theropod dinosaur genus, whose fossil remains were found in 1995 by a team of the Museo Argentino de Ciencias Naturales Bernardino Rivadavia of Argentina, in the Bajo de la Carpa Formation, which is found in the Rio Negro Province of Argentina. The team recovered a partial postcranial skeleton, that is, parts of its skeleton, like some of its tail vertebrae, were found but the skull was missing. They were also discovered in partial articulation, which means that the bones of the specimen were placed almost in their proper positions. It was found that this dinosaur would have been alive during the Santonian age of the Late Cretaceous. These bones were only named and described as a new genus of dinosaurs in 2007 by Agustín G. Martinelli and Ezequiel I. Vera. The genus consists of a single species, which is also its type species and is named Achillesaurus manazzonei. In their research, Agustín G. Martinelli and Ezequiel I. Vera found this new genus to be a basal member of the family Alvarezsauridae because it was found to have similar features as the type genus of that family, Alvarezsaurus, which was also found in Argentina from the same locality, that is, the Bajo de la Carpa Formation. However, Apesteguía, along with others, recently proposed that the new alvarezsaurid Achillesaurus and Alvarezsaurus might be the same dinosaurs, as they only have minor differences between them. Keep reading to find out more amazing facts about this fascinating member of Dinosauria!
If you want to know more about other cool dinosaurs, check out our Yandusaurus interesting facts for kids and Valdoraptor interesting facts for kids pages.
The name of this new alvarezsaurid was given by Agustín G. Martinelli and Ezequiel I. Vera and is phonetically pronounced as 'Ah-kil-le-sore-us'.
Achillesaurus manazzonei was a member of the large clade Theropoda and was classified by Martinelli and Vera as a new alvarezsaurid based on the fact that much of the structure of its bones resembled that of Alvarezsaurids. Members of Alvarezsauridae had an insectivorous or carnivorous diet, short forelimbs, and strong breast and arm muscles. These muscles, complete with their bird-like hands, were thought to have facilitated easier digging for insect nests. Alvarezsauridae is considered to be a basal group in Maniraptora, and are thought to have been related to the members of Ornithomimosauria. Achillesaurus was also found to share many features with Alvarezsaurus, which was also found not far away in the same locality, that is, in the Bajo de la Carpa Formation in Argentina, and would have also lived during the Santonian age of the Late Cretaceous. Alvarezsaurus is the most basal member of Alvarezsauridae, as the family was formed to contain this dinosaur, and it is also the type genus for it. The relationship between Achillesaurus and Alvarezsaurus is not clear but recently, Apesteguía suggested that they could have been the same dinosaur.
The holotype specimen of this alvarezsaurid was found in the rock strata in the Bajo de la Carpa Formation that corresponded to the Upper Cretaceous, which means that it would have been alive during the Santonian age of the Late Cretaceous period in modern-day Argentina. Thus, they would have walked on Earth about 85 million years ago.
Since they lived during one of the last ages, that is, the Santonian age, of the Late Cretaceous period, they would have died off in the Cretaceous-Paleogene extinction event that occurred almost 66 million years ago.
This alvarezsaurid dinosaur had lived in what is now known as Argentina as fossil remains of its holotype specimen were recovered from the Bajo de la Carpa Formation, which is situated in the Rio Negro Province of Argentina.
Research into the deposits of the Bajo de la Carpa Formation of Argentina determined that it would have been a terrestrial environment, and there would have been many rivers and water bodies in the region.
Achillesaurus manazzonei is thought to have been a solitary animal and would have lived independent of other Alvarezsaurids. It would have coexisted with other members of Dinosauria that would have been found in the same location, such as Alvarezsaurus, another alvarezsaurid that lived during the Santonian age of the Late Cretaceous, and whose specimen was found in the Bajo de la Carpa Formation in Argentina.
The lifespan of this new alvarezsaurid is not currently known due to a lack of research.
These dinosaurs, like all other members of Dinosauria, were oviparous and laid eggs instead of giving birth to live young like mammals.
The Achillesaurus skeleton recovered from Bajo de la Carpa Formation consisted of postcranial remains of a single specimen, which included some tail vertebrae, a sacral vertebra, many bones from its leg, which are thought to have made up diagnostic features for this new alvarezsaurid genus. This dinosaur could have been covered with feathers and would have been similar to Alvarezsaurus in appearance as it had long legs and a long tail. Achillesaurus was, at first, thought to have been twice the size of Alvarezsaurus, but more research concluded that the bones of the latter were of a juvenile specimen.
The total number of bones this new alvarezsaurid would have had is currently unknown based on the fact that only a partial skeleton of this dinosaur has been found from the Bajo de la Carpa Formation, and an Achillesaurus skull has still not been discovered.
All members of Dinosauria are thought to have communicated using vocalizations or body language, but the specific way this theropod communicated is not currently known.
Although the exact size of this theropod is not known, all Alvarezsaurids have been estimated to have had a body length in the range of 20-98 in (0.5-2.5 m). Alvarezsaurus, which also lived during the Late Cretaceous and with whom Achillesaurus manazzonei had an unspecified relationship, was 4.6 ft (1.4 m) in length.
Since Alvarezsaurids are thought to have been fast bipedal animals due to their long hind limbs, Achillesmanazzonei would have also been an agile runner.
The weight of this genus of dinosaurs is not currently known due to a lack of research and evidence.
There were no specific names for the males and females of this species and genus.
A baby dinosaur of this kind would have been called a hatchling.
The diet of Alvarezsaurids has been an issue of debate since not much is known about their teeth. While it was first thought that they would have had a diet that consisted exclusively of insects, evidence was found that suggested that these dinosaurs fed on dinosaur eggs as well.
Although fairly small in size, they could have been aggressive towards any animal that would have invaded their territory.
Members of Alvarezsauridae were once thought to have been flightless birds of the Mesozoic Era based on the many features it shared with birds and were also thought to have been a part of Avialae, which is a clade that consists of all birds. However, new research has shown that those traits in Alvarezsaurids were evolved independently, and they were not related to birds or flying dinosaurs.
Yes, Achillesaurus manazzonei belonged to Theropoda. Theropoda consists of a wide variety of dinosaurs, including the ancestors of birds, as we see them today.
Achillesaurus was named by Agustín G. Martinelli and Ezequiel I. Vera, for the Achilles' heel, which was the weakest point of Achilles from the book 'Iliad' by Homer, as diagnostic features were found in that part of the holotype specimen. Thus, the name translates to 'Achilles lizard'. The specific name is a reference to Prof. Rafael Manazzone, who helped in the research and discovery of this theropod.
Here at Kidadl, we have carefully created lots of interesting family-friendly dinosaur facts for everyone to discover! For more relatable content, check out these Camarillasaurus facts and Suuwassea facts for kids.
You can even occupy yourself at home by coloring in one of our free printable Achillesaurus coloring pages.
Image one by Levi bernardo.
Image two by Karkemish.
Read The Disclaimer
At Kidadl we pride ourselves on offering families original ideas to make the most of time spent together at home or out and about, wherever you are in the world. We strive to recommend the very best things that are suggested by our community and are things we would do ourselves - our aim is to be the trusted friend to parents.
We try our very best, but cannot guarantee perfection. We will always aim to give you accurate information at the date of publication - however, information does change, so it’s important you do your own research, double-check and make the decision that is right for your family.
Kidadl provides inspiration to entertain and educate your children. We recognise that not all activities and ideas are appropriate and suitable for all children and families or in all circumstances. Our recommended activities are based on age but these are a guide. We recommend that these ideas are used as inspiration, that ideas are undertaken with appropriate adult supervision, and that each adult uses their own discretion and knowledge of their children to consider the safety and suitability.
Kidadl cannot accept liability for the execution of these ideas, and parental supervision is advised at all times, as safety is paramount. Anyone using the information provided by Kidadl does so at their own risk and we can not accept liability if things go wrong.
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